10911(  2) - 05/15/06 15:53  - [  1]

                  HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10911

Version: 2    Check-in Time: 15-May-2006 19:52:38       STScI Edit Number: <none>

Title
Calibration of ACS F814W Surface Brightness Fluctuations
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Type             Cycle     Parallel Pointing Tolerance
GO               15        <none>
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Investigators
                                                                                     Contact?
    PI: Dr. John P. Blakeslee             Washington State University
   CoI: Dr. Patrick Cote                  Dominion Astrophysical Observatory            N
   CoI: Dr. Laura Ferrarese               Dominion Astrophysical Observatory            N
   CoI: Dr. Andres Jordan                 European Southern Observatory - Germany       N
   CoI: Dr. Simona Mei                    The Johns Hopkins University                  N
   CoI: Dr. John L. Tonry                 University of Hawaii                          N

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Abstract

The surface brightness fluctuations (SBF) method has emerged as the primary distance
indicator for mapping local large-scale structures (Virgo, Fornax), as well as the
velocity field out to nearly 15, 000 km/s (z < 0.05). This is because other
precision distance indicators either lack the requisite depth (Cepheids, TRGB) or
are too rare for adequate sampling (supernovae), while more traditional methods
(Tully-Fisher, fundamental plane) lack the necessary precision. The SBF method is
now being used with great success in several major ACS Wide Field Camera programs.
However, whereas the band of choice for the nearby structure studies has been
F850LP, for the distant large-scale flow studies it is F814W because of its much
greater throughput. As a result, the current calibration for the more distant
studies is inadequate. We propose to establish the first systematic calibration of
the SBF method in the important F814W ACS WFC bandpass. We will do this by measuring
SBF in an optimized sample of galaxies in the nearby compact Fornax cluster. Given
the large amount of effort and HST time being dedicated to F814W SBF measurements,
it is imperative that we correct this outstanding calibration problem while time
remains. For an extremely modest expenditure of orbits, we will remove a significant
systematic error and vastly improve the overall accuracy of the ongoing ACS F814W
SBF work. These data will also greatly enhance the legacy value of the HST archive
for future SBF studies.
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                                                10911(  2) - 05/15/06 15:53  - [  2]

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

     We will observe each target galaxy for one orbit with the ACS/WFC. We take
     three dithered 408-second exposures in F814W using a 3-point dither line
     pattern, followed by two dithered 340-second exposures in F475W using a 2-point
     dither pattern. The orientation of target 1 is constrained so as to include
     both NGC1374 and its close neighbor NGC1375, which will also be useful for our
     calibration. Several of the other targets have their orientations constrained
     so that bright nearby stars do not land at the edge of (or just off) the field-
     of-view, since we have found that bright stars in these locations can create an
     enormous amount of scattered light, and thus greatly diminish the data quality.

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


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


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

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                                                10911(  2) - 05/15/06 15:53  - [  3]

TARGET LIST    Fixed Targets
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Tar|   Target   |         Target        |            Target              |Coord   | Radial |             Flux data
No |    Name    |       Description     |           Position             |Eqnx    |  Vel.  |
------------------------------------------------------------------------------------------------------------------------------------
1   NGC1374      GALAXY, ELLIPTICAL      RA=03H35M16.1000S +/- 0.1",      J2000             V = 11.0+/-0.5
                                         DEC=-35D14'31.00" +/- 0.1"
    Reference Frame: ICRS

2   NGC1427      GALAXY, ELLIPTICAL      RA=03H42M19.4000S +/- 0.1",      J2000             V = 10.7+/-0.5
                                         DEC=-35D23'34.00" +/- 0.1"
    Reference Frame: ICRS

3   IC2006       GALAXY, ELLIPTICAL      RA=03H54M28.4000S +/- 0.1",      J2000             V = 11.2+/-0.5
                                         DEC=-35D58'2.00" +/- 0.1"
    Reference Frame: ICRS

4   NGC1380      GALAXY, ELLIPTICAL      RA=03H36M27.6000S +/- 0.1",      J2000             V = 10.2+/-0.5
                                         DEC=-34D58'34.00" +/- 0.1"
    Reference Frame: ICRS

5   NGC1399      GALAXY, ELLIPTICAL      RA=03H38M29.1000S +/- 0.1",      J2000             V = 9.0+/-0.5
                                         DEC=-35D27'3.00" +/- 0.1"
    Reference Frame: ICRS

6   NGC1404      GALAXY, ELLIPTICAL      RA=03H38M51.9000S +/- 0.1",      J2000             V = 9.9+/-0.5
                                         DEC=-35D35'40.00" +/- 0.1"
    Reference Frame: ICRS

                                                10911(  2) - 05/15/06 15:53  - [  4]

Patterns
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Pattern_Number: 1

                    Primary_Pattern                   Secondary_Pattern
Pattern_Type        ACS-WFC-DITHER-LINE
Pattern_Purpose     DITHER
Number_Of_Points    3
Point_Spacing       1.4
Line_Spacing        <none>
Coordinate_Frame    POS-TARG
Pattern_Orient      85.28
Angle_Between_Sides <none>
Center_Pattern      NO

------------------------------------------------------------------------------------------------------------------------------------
Pattern_Number: 2

                    Primary_Pattern                   Secondary_Pattern
Pattern_Type        ACS-WFC-DITHER-LINE
Pattern_Purpose     DITHER
Number_Of_Points    2
Point_Spacing       2.8
Line_Spacing        <none>
Coordinate_Frame    POS-TARG
Pattern_Orient      85.28
Angle_Between_Sides <none>
Center_Pattern      NO

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                                                10911(  2) - 05/15/06 15:53  - [  5]

Visit: 01
     Visit Priority:      <none>
     Visit Requirements:  ORIENT 302.0D TO 321.0 D
     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    NGC1374     ACS/WFC  ACCUM   WFC       F814W            CR-SPLIT=NO                    1   1230 S     PATTERN 1 1
                                                                                                see below
------------------------------------------------------------------------------------------------------------------------------------
2    NGC1374     ACS/WFC  ACCUM   WFC       F475W            CR-SPLIT=NO                    1   680 S      PATTERN 2 2
                                                                                                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 |
------------------------------------------------------------------------------------------------------------------------------------
NGC1374             1     ACS/WFC  ACCUM   WFC      F814W          1            none         none       none       1       408.0 S
NGC1374             1     ACS/WFC  ACCUM   WFC      F814W          2            none         none       none       1       408.0 S
NGC1374             1     ACS/WFC  ACCUM   WFC      F814W          3            none         none       none       1       408.0 S
NGC1374             2     ACS/WFC  ACCUM   WFC      F475W          1            none         none       none       1       340.0 S
NGC1374             2     ACS/WFC  ACCUM   WFC      F475W          2            none         none       none       1       340.0 S
                                                10911(  2) - 05/15/06 15:53  - [  6]

Visit: 02
     Visit Priority:      <none>
     Visit Requirements:  ORIENT 221.0D TO 289.0 D; ORIENT 20.0D TO 140.0 D
     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    NGC1427     ACS/WFC  ACCUM   WFC       F814W            CR-SPLIT=NO                    1   1230 S     POS TARG 2, 18; PATTERN 1
                                                                                                see below  1
------------------------------------------------------------------------------------------------------------------------------------
2    NGC1427     ACS/WFC  ACCUM   WFC       F475W            CR-SPLIT=NO                    1   680 S      POS TARG 2, 18; PATTERN 2
                                                                                                see below  2
------------------------------------------------------------------------------------------------------------------------------------

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 |
------------------------------------------------------------------------------------------------------------------------------------
NGC1427             1     ACS/WFC  ACCUM   WFC      F814W          1            none         none       none       1       408.0 S
NGC1427             1     ACS/WFC  ACCUM   WFC      F814W          2            none         none       none       1       408.0 S
NGC1427             1     ACS/WFC  ACCUM   WFC      F814W          3            none         none       none       1       408.0 S
NGC1427             2     ACS/WFC  ACCUM   WFC      F475W          1            none         none       none       1       340.0 S
NGC1427             2     ACS/WFC  ACCUM   WFC      F475W          2            none         none       none       1       340.0 S
                                                10911(  2) - 05/15/06 15:53  - [  7]

Visit: 03
     Visit Priority:      <none>
     Visit Requirements:  ORIENT 308.0D TO 210.0 D; ORIENT 236.0D TO 272.0 D
     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    IC2006      ACS/WFC  ACCUM   WFC       F814W            CR-SPLIT=NO                    1   1230 S     POS TARG 2, 18; PATTERN 1
                                                                                                see below  1
------------------------------------------------------------------------------------------------------------------------------------
2    IC2006      ACS/WFC  ACCUM   WFC       F475W            CR-SPLIT=NO                    1   680 S      POS TARG 2, 18; PATTERN 2
                                                                                                see below  2
------------------------------------------------------------------------------------------------------------------------------------

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 |
------------------------------------------------------------------------------------------------------------------------------------
IC2006              1     ACS/WFC  ACCUM   WFC      F814W          1            none         none       none       1       408.0 S
IC2006              1     ACS/WFC  ACCUM   WFC      F814W          2            none         none       none       1       408.0 S
IC2006              1     ACS/WFC  ACCUM   WFC      F814W          3            none         none       none       1       408.0 S
IC2006              2     ACS/WFC  ACCUM   WFC      F475W          1            none         none       none       1       340.0 S
IC2006              2     ACS/WFC  ACCUM   WFC      F475W          2            none         none       none       1       340.0 S
                                                10911(  2) - 05/15/06 15:53  - [  8]

Visit: 04
     Visit Priority:      <none>
     Visit Requirements:  ORIENT 63.0D TO 120.0 D; ORIENT 244.0D TO 300.0 D
     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    NGC1380     ACS/WFC  ACCUM   WFC       F814W            CR-SPLIT=NO                    1   1230 S     POS TARG 2, 20; PATTERN 1
                                                                                                see below  1
------------------------------------------------------------------------------------------------------------------------------------
2    NGC1380     ACS/WFC  ACCUM   WFC       F475W            CR-SPLIT=NO                    1   680 S      POS TARG 2, 20; PATTERN 2
                                                                                                see below  2
------------------------------------------------------------------------------------------------------------------------------------

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 |
------------------------------------------------------------------------------------------------------------------------------------
NGC1380             1     ACS/WFC  ACCUM   WFC      F814W          1            none         none       none       1       408.0 S
NGC1380             1     ACS/WFC  ACCUM   WFC      F814W          2            none         none       none       1       408.0 S
NGC1380             1     ACS/WFC  ACCUM   WFC      F814W          3            none         none       none       1       408.0 S
NGC1380             2     ACS/WFC  ACCUM   WFC      F475W          1            none         none       none       1       340.0 S
NGC1380             2     ACS/WFC  ACCUM   WFC      F475W          2            none         none       none       1       340.0 S
                                                10911(  2) - 05/15/06 15:53  - [  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    NGC1399     ACS/WFC  ACCUM   WFC       F814W            CR-SPLIT=NO                    1   1230 S     POS TARG 2, 18; PATTERN 1
                                                                                                see below  1
------------------------------------------------------------------------------------------------------------------------------------
2    NGC1399     ACS/WFC  ACCUM   WFC       F475W            CR-SPLIT=NO                    1   680 S      POS TARG 2, 18; PATTERN 2
                                                                                                see below  2
------------------------------------------------------------------------------------------------------------------------------------

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 |
------------------------------------------------------------------------------------------------------------------------------------
NGC1399             1     ACS/WFC  ACCUM   WFC      F814W          1            none         none       none       1       408.0 S
NGC1399             1     ACS/WFC  ACCUM   WFC      F814W          2            none         none       none       1       408.0 S
NGC1399             1     ACS/WFC  ACCUM   WFC      F814W          3            none         none       none       1       408.0 S
NGC1399             2     ACS/WFC  ACCUM   WFC      F475W          1            none         none       none       1       340.0 S
NGC1399             2     ACS/WFC  ACCUM   WFC      F475W          2            none         none       none       1       340.0 S
                                                10911(  2) - 05/15/06 15:53  - [ 10]

Visit: 06
     Visit Priority:      <none>
     Visit Requirements:  ORIENT 36.0D TO 187.0 D; ORIENT 220.0D TO 273.5 D; ORIENT 317.0D TO 337.0 D
     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    NGC1404     ACS/WFC  ACCUM   WFC       F814W            CR-SPLIT=NO                    1   1230 S     POS TARG 2, 18; PATTERN 1
                                                                                                see below  1
------------------------------------------------------------------------------------------------------------------------------------
2    NGC1404     ACS/WFC  ACCUM   WFC       F475W            CR-SPLIT=NO                    1   680 S      POS TARG 2, 18; PATTERN 2
                                                                                                see below  2
------------------------------------------------------------------------------------------------------------------------------------

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 |
------------------------------------------------------------------------------------------------------------------------------------
NGC1404             1     ACS/WFC  ACCUM   WFC      F814W          1            none         none       none       1       408.0 S
NGC1404             1     ACS/WFC  ACCUM   WFC      F814W          2            none         none       none       1       408.0 S
NGC1404             1     ACS/WFC  ACCUM   WFC      F814W          3            none         none       none       1       408.0 S
NGC1404             2     ACS/WFC  ACCUM   WFC      F475W          1            none         none       none       1       340.0 S
NGC1404             2     ACS/WFC  ACCUM   WFC      F475W          2            none         none       none       1       340.0 S
                                                10911(  2) - 05/15/06 15:53  - [ 11]

            Summary Form for Proposal  10911

  Item                         Used in this proposal
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  Apertures                    WFC
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  Configurations               ACS/WFC
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  Opmodes                      ACCUM
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  Optional Parameters          CR-SPLIT=NO
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  Special Requirements         ORIENT 302.0D TO 321.0 D; PATTERN 1 1; PATTERN 2 2; ORIENT 221.0D TO 289.0 D; ORIENT 20.0D TO 140.0
                               D; POS TARG 2, 18; ORIENT 308.0D TO 210.0 D; ORIENT 236.0D TO 272.0 D; ORIENT 63.0D TO 120.0 D;
                               ORIENT 244.0D TO 300.0 D; POS TARG 2, 20; ORIENT 36.0D TO 187.0 D; ORIENT 220.0D TO 273.5 D; ORIENT
                               317.0D TO 337.0 D;
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  Spectral Elements            F814W F475W
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  Target Names                 NGC1374 NGC1427 IC2006 NGC1380 NGC1399 NGC1404
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