10789(  6) - 06/06/07 09:31  - [  1]

                  HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10789

Version: 6    Check-in Time: 06-Jun-2007 13:31:15       STScI Edit Number: 0

Title
The Role of Environment in the Formation of Dwarf Galaxies
------------------------------------------------------------------------------------
Type             Cycle     Parallel Pointing Tolerance
GO               15        <none>
------------------------------------------------------------------------------------
Investigators
                                                                                     Contact?
    PI: Dr. Christopher J. Conselice      University of Nottingham
   CoI: Dr. Enrico V. Held                Osservatorio Astronomico di Padova            N
   CoI: Dr. Sven De Rijcke                Universiteit Gent                             N
   CoI: Prof. John S. Gallagher III       University of Wisconsin - Madison             Y
   CoI: Prof. Robert W. O'Connell         The University of Virginia                    N

------------------------------------------------------------------------------------
Abstract

Clusters of galaxies contain an overdensity of dwarfs compared to the field. Within
galaxy clusters there is also a correlation between the overdensity of dwarfs and
local galaxy density, such that areas of lower galaxy density contain more dwarfs
per giant. The origin of these 'extra' dwarfs is unknown, but a large fraction of
them did not form through standard collapses early in the universe. Some dwarf
ellipticals in clusters have metal rich and young (< 6 Gyr) stellar populations
while others contain old metal poor populations, suggesting multiple formation
mechanisms and time scales. We propose to test the idea that dwarfs descend from
galaxies accreted into clusters during the past 8 Gyr by correlating ages and
metallicities of dwarfs with their internal structures - spiral arms, bars, and
disks. If dwarfs originate from more massive galaxies then these features should be
common in metal rich and young dwarfs. On the other hand, if no correlation is found
it would suggest that dwarfs form through in-situ collapses of gas in the
intragalactic medium after the universe was reionized.
------------------------------------------------------------------------------------
                                                10789(  6) - 06/06/07 09:31  - [  2]

  Observations Description
  ------------------------

     Our observing program consists of imaging in the F814W band and F555W band for
     outer fields of the Perseus cluster. Our program is fairly straightforward and
     consists of 1 orbit in each band per pointing. We split each orbit into three
     different exposures to remove cosmic rays.

  Real Time Justification
  -----------------------


  Calibration Justification
  -------------------------


  Additional Comments
  -------------------

------------------------------------------------------------------------------------

                                                10789(  6) - 06/06/07 09:31  - [  3]

TARGET LIST    Fixed Targets
------------------------------------------------------------------------------------------------------------------------------------
Tar|   Target   |         Target        |            Target              |Coord   | Radial |             Flux data
No |    Name    |       Description     |           Position             |Eqnx    |  Vel.  |
------------------------------------------------------------------------------------------------------------------------------------
1   NPERSEUS1    CLUSTER OF GALAXIES,    RA=03H18M49.5000S +/- 0.1",      J2000             V = 20.0
                 RICH CLUSTER            DEC=+41D24'7.30" +/- 0.1"
    Reference Frame: ICRS

2   NPERSEUS2    CLUSTER OF GALAXIES,    RA=03H18M33.0000S +/- 0.1",      J2000             V = 20.0
                 RICH CLUSTER            DEC=+41D26'37.80" +/- 0.1"
    Reference Frame: ICRS

3   NPERSEUS3    CLUSTER OF GALAXIES,    RA=03H18M34.3000S +/- 0.1",      J2000             V = 20.0
                 RICH CLUSTER            DEC=+41D22'53.70" +/- 0.1"
    Reference Frame: ICRS

4   NPERSEUS4    CLUSTER OF GALAXIES,    RA=03H18M8.8000S +/- 0.1",       J2000             V = 20.0
                 RICH CLUSTER            DEC=+41D23'11.40" +/- 0.1"
    Reference Frame: ICRS

5   NPERSEUS5    CLUSTER OF GALAXIES,    RA=03H18M8.2000S +/- 0.1",       J2000             V = 20.0
                 RICH CLUSTER            DEC=+41D25'50.80" +/- 0.1"
    Reference Frame: ICRS

6   NPERSEUS6    CLUSTER OF GALAXIES,    RA=03H17M54.1000S +/- 0.1",      J2000             V = 20.0
                 RICH CLUSTER            DEC=+41D27'46.30" +/- 0.1"
    Reference Frame: ICRS

7   NPERSEUS7    CLUSTER OF GALAXIES,    RA=03H17M30.9000S +/- 0.1",      J2000             V = 20.0
                 RICH CLUSTER            DEC=+41D25'10.20" +/- 0.1"
    Reference Frame: ICRS

                                                10789(  6) - 06/06/07 09:31  - [  4]

Patterns
------------------------------------------------------------------------------------------------------------------------------------
Pattern_Number: 1

                    Primary_Pattern                   Secondary_Pattern
Pattern_Type        WFPC2-LINE
Pattern_Purpose     DITHER
Number_Of_Points    2
Point_Spacing       0.3535
Line_Spacing        <none>
Coordinate_Frame    POS-TARG
Pattern_Orient      45.0
Angle_Between_Sides <none>
Center_Pattern      NO

------------------------------------------------------------------------------------------------------------------------------------
                                                10789(  6) - 06/06/07 09:31  - [  5]

Visit: 01
     Visit Priority:      <none>
     Visit Requirements:  <none>
     On Hold Comments:    <none>
     Additional Comments: <none>


Exposures
------------------------------------------------------------------------------------------------------------------------------------
Exp |   Target  | Instr  | Oper. | Aper    |Spectral|Central|           Optional           |Num|   Time   |       Special
Num |    Name   | Config | Mode  | or FOV  |Element |Waveln.|          Parameters          |Exp|          |     Requirements
------------------------------------------------------------------------------------------------------------------------------------
1    NPERSEUS1   WFPC2    IMAGE   WFALL-FIX F814W                                           1   800 S      PATTERN 1 1-2
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------
2    NPERSEUS1   WFPC2    IMAGE   WFALL-FIX F555W                                           1   800 S
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------

Sub Exposures
------------------------------------------------------------------------------------------------------------------------------------
Target             | Exp |Instr   | Oper. |  Aper  |Spectral|Cent.|Primary     |Secondary   |Iteration |CR-SPLIT  |Orbit  |Duration
Name               | Num |Config  | Mode  | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num       |Num       |Number |
------------------------------------------------------------------------------------------------------------------------------------
NPERSEUS1           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS1           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       2          1       500.0 S
                                           X
NPERSEUS1           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS1           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       2          2       400.0 S
                                           X
NPERSEUS1           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS1           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       2          1       450.0 S
                                           X
NPERSEUS1           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS1           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       2          2       500.0 S
                                           X
                                                10789(  6) - 06/06/07 09:31  - [  6]

Visit: 02
     Visit Priority:      <none>
     Visit Requirements:  <none>
     On Hold Comments:    <none>
     Additional Comments: <none>


Exposures
------------------------------------------------------------------------------------------------------------------------------------
Exp |   Target  | Instr  | Oper. | Aper    |Spectral|Central|           Optional           |Num|   Time   |       Special
Num |    Name   | Config | Mode  | or FOV  |Element |Waveln.|          Parameters          |Exp|          |     Requirements
------------------------------------------------------------------------------------------------------------------------------------
1    NPERSEUS2   WFPC2    IMAGE   WFALL-FIX F814W                                           1   800 S      PATTERN 1 1-2
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------
2    NPERSEUS2   WFPC2    IMAGE   WFALL-FIX F555W                                           1   800 S
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------

Sub Exposures
------------------------------------------------------------------------------------------------------------------------------------
Target             | Exp |Instr   | Oper. |  Aper  |Spectral|Cent.|Primary     |Secondary   |Iteration |CR-SPLIT  |Orbit  |Duration
Name               | Num |Config  | Mode  | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num       |Num       |Number |
------------------------------------------------------------------------------------------------------------------------------------
NPERSEUS2           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS2           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       2          1       500.0 S
                                           X
NPERSEUS2           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS2           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       2          2       400.0 S
                                           X
NPERSEUS2           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS2           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       2          1       400.0 S
                                           X
NPERSEUS2           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS2           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       2          2       500.0 S
                                           X
                                                10789(  6) - 06/06/07 09:31  - [  7]

Visit: 03
     Visit Priority:      <none>
     Visit Requirements:  <none>
     On Hold Comments:    <none>
     Additional Comments: <none>


Exposures
------------------------------------------------------------------------------------------------------------------------------------
Exp |   Target  | Instr  | Oper. | Aper    |Spectral|Central|           Optional           |Num|   Time   |       Special
Num |    Name   | Config | Mode  | or FOV  |Element |Waveln.|          Parameters          |Exp|          |     Requirements
------------------------------------------------------------------------------------------------------------------------------------
1    NPERSEUS3   WFPC2    IMAGE   WFALL-FIX F555W                                           1   800 S      PATTERN 1 1-2
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------
2    NPERSEUS3   WFPC2    IMAGE   WFALL-FIX F814W                                           1   800 S
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------

Sub Exposures
------------------------------------------------------------------------------------------------------------------------------------
Target             | Exp |Instr   | Oper. |  Aper  |Spectral|Cent.|Primary     |Secondary   |Iteration |CR-SPLIT  |Orbit  |Duration
Name               | Num |Config  | Mode  | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num       |Num       |Number |
------------------------------------------------------------------------------------------------------------------------------------
NPERSEUS3           1     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS3           1     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       2          1       500.0 S
                                           X
NPERSEUS3           1     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS3           1     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       2          2       400.0 S
                                           X
NPERSEUS3           2     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS3           2     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       2          1       400.0 S
                                           X
NPERSEUS3           2     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS3           2     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       2          2       500.0 S
                                           X
                                                10789(  6) - 06/06/07 09:31  - [  8]

Visit: 04
     Visit Priority:      <none>
     Visit Requirements:  <none>
     On Hold Comments:    <none>
     Additional Comments: <none>


Exposures
------------------------------------------------------------------------------------------------------------------------------------
Exp |   Target  | Instr  | Oper. | Aper    |Spectral|Central|           Optional           |Num|   Time   |       Special
Num |    Name   | Config | Mode  | or FOV  |Element |Waveln.|          Parameters          |Exp|          |     Requirements
------------------------------------------------------------------------------------------------------------------------------------
1    NPERSEUS4   WFPC2    IMAGE   WFALL-FIX F814W                                           1   800 S      PATTERN 1 1-2
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------
2    NPERSEUS4   WFPC2    IMAGE   WFALL-FIX F555W                                           1   800 S
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------

Sub Exposures
------------------------------------------------------------------------------------------------------------------------------------
Target             | Exp |Instr   | Oper. |  Aper  |Spectral|Cent.|Primary     |Secondary   |Iteration |CR-SPLIT  |Orbit  |Duration
Name               | Num |Config  | Mode  | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num       |Num       |Number |
------------------------------------------------------------------------------------------------------------------------------------
NPERSEUS4           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS4           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       2          1       500.0 S
                                           X
NPERSEUS4           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       1          2       400.0 S
                                           X
NPERSEUS4           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       2          2       500.0 S
                                           X
NPERSEUS4           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       1          1       400.0 S
                                           X
NPERSEUS4           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       2          1       500.0 S
                                           X
NPERSEUS4           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS4           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       2          2       500.0 S
                                           X
                                                10789(  6) - 06/06/07 09:31  - [  9]

Visit: 05
     Visit Priority:      <none>
     Visit Requirements:  <none>
     On Hold Comments:    <none>
     Additional Comments: <none>


Exposures
------------------------------------------------------------------------------------------------------------------------------------
Exp |   Target  | Instr  | Oper. | Aper    |Spectral|Central|           Optional           |Num|   Time   |       Special
Num |    Name   | Config | Mode  | or FOV  |Element |Waveln.|          Parameters          |Exp|          |     Requirements
------------------------------------------------------------------------------------------------------------------------------------
1    NPERSEUS5   WFPC2    IMAGE   WFALL-FIX F814W                                           1   800 S      PATTERN 1 1-2
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------
2    NPERSEUS5   WFPC2    IMAGE   WFALL-FIX F555W                                           1   800 S
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------

Sub Exposures
------------------------------------------------------------------------------------------------------------------------------------
Target             | Exp |Instr   | Oper. |  Aper  |Spectral|Cent.|Primary     |Secondary   |Iteration |CR-SPLIT  |Orbit  |Duration
Name               | Num |Config  | Mode  | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num       |Num       |Number |
------------------------------------------------------------------------------------------------------------------------------------
NPERSEUS5           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS5           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       2          1       500.0 S
                                           X
NPERSEUS5           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS5           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       2          2       400.0 S
                                           X
NPERSEUS5           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       1          1       400.0 S
                                           X
NPERSEUS5           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       2          1       500.0 S
                                           X
NPERSEUS5           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS5           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       2          2       500.0 S
                                           X
                                                10789(  6) - 06/06/07 09:31  - [ 10]

Visit: 06
     Visit Priority:      <none>
     Visit Requirements:  <none>
     On Hold Comments:    <none>
     Additional Comments: <none>


Exposures
------------------------------------------------------------------------------------------------------------------------------------
Exp |   Target  | Instr  | Oper. | Aper    |Spectral|Central|           Optional           |Num|   Time   |       Special
Num |    Name   | Config | Mode  | or FOV  |Element |Waveln.|          Parameters          |Exp|          |     Requirements
------------------------------------------------------------------------------------------------------------------------------------
1    NPERSEUS6   WFPC2    IMAGE   WFALL-FIX F814W                                           1   800 S      PATTERN 1 1-2
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------
2    NPERSEUS6   WFPC2    IMAGE   WFALL-FIX F555W                                           1   800 S
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------

Sub Exposures
------------------------------------------------------------------------------------------------------------------------------------
Target             | Exp |Instr   | Oper. |  Aper  |Spectral|Cent.|Primary     |Secondary   |Iteration |CR-SPLIT  |Orbit  |Duration
Name               | Num |Config  | Mode  | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num       |Num       |Number |
------------------------------------------------------------------------------------------------------------------------------------
NPERSEUS6           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS6           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       2          1       500.0 S
                                           X
NPERSEUS6           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS6           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       2          2       400.0 S
                                           X
NPERSEUS6           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS6           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       2          1       400.0 S
                                           X
NPERSEUS6           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS6           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       2          2       500.0 S
                                           X
                                                10789(  6) - 06/06/07 09:31  - [ 11]

Visit: 07
     Visit Priority:      <none>
     Visit Requirements:  <none>
     On Hold Comments:    <none>
     Additional Comments: <none>


Exposures
------------------------------------------------------------------------------------------------------------------------------------
Exp |   Target  | Instr  | Oper. | Aper    |Spectral|Central|           Optional           |Num|   Time   |       Special
Num |    Name   | Config | Mode  | or FOV  |Element |Waveln.|          Parameters          |Exp|          |     Requirements
------------------------------------------------------------------------------------------------------------------------------------
1    NPERSEUS7   WFPC2    IMAGE   WFALL-FIX F814W                                           1   800 S      PATTERN 1 1-2
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------
2    NPERSEUS7   WFPC2    IMAGE   WFALL-FIX F555W                                           1   800 S
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------

Sub Exposures
------------------------------------------------------------------------------------------------------------------------------------
Target             | Exp |Instr   | Oper. |  Aper  |Spectral|Cent.|Primary     |Secondary   |Iteration |CR-SPLIT  |Orbit  |Duration
Name               | Num |Config  | Mode  | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num       |Num       |Number |
------------------------------------------------------------------------------------------------------------------------------------
NPERSEUS7           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS7           1     WFPC2    IMAGE   WFALL-FI F814W          1            none         none       2          1       500.0 S
                                           X
NPERSEUS7           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS7           1     WFPC2    IMAGE   WFALL-FI F814W          2            none         none       2          2       400.0 S
                                           X
NPERSEUS7           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       1          1       500.0 S
                                           X
NPERSEUS7           2     WFPC2    IMAGE   WFALL-FI F555W          1            none         none       2          1       400.0 S
                                           X
NPERSEUS7           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       1          2       500.0 S
                                           X
NPERSEUS7           2     WFPC2    IMAGE   WFALL-FI F555W          2            none         none       2          2       500.0 S
                                           X
                                                10789(  6) - 06/06/07 09:31  - [ 12]

            Summary Form for Proposal  10789

  Item                         Used in this proposal
------------------------------------------------------------------------------------------------------------------------------------
  Apertures                    WFALL-FIX
------------------------------------------------------------------------------------------------------------------------------------
  Configurations               WFPC2
------------------------------------------------------------------------------------------------------------------------------------
  Opmodes                      IMAGE
------------------------------------------------------------------------------------------------------------------------------------
  Special Requirements         PATTERN 1 1-2;
------------------------------------------------------------------------------------------------------------------------------------
  Spectral Elements            F814W F555W
------------------------------------------------------------------------------------------------------------------------------------
  Target Names                 NPERSEUS1 NPERSEUS2 NPERSEUS3 NPERSEUS4 NPERSEUS5 NPERSEUS6 NPERSEUS7
------------------------------------------------------------------------------------------------------------------------------------