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    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID 5470
                                                       Report Date: 18-Jul-95:17:28
                                                       Version: **********
                                                       Check-in Date: **********

1.Proposal Title:
WFPC2 IMAGING OF THE PROTOGALAXY CANDIDATE B2 0902+34
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2. Scientific Category   3. Proposal For  4. Proposal Type        5. Continuation ID
GALAXIES & CLUSTERS         GO                                       <none>
Sub Category
DISTANT GALAXIES
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6. Principal Investigator   Institution                    Country    Telephone
 Peter R Eisenhardt         JPL                            USA        818-354-4395

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7. Abstract
We propose to obtain high spatial resolution imaging with WFPC2 of the continuum and
Ly-alpha line emission from the distant radio galaxy B2 0902+34. This object appears
to have the largest UV to optical (rest frame) flux ratio measured for a radio
galaxy, and at z=3.395 is also among the most distant galaxies known.  It is
therefore an excellent candidate for a protogalaxy. Our objective is to obtain a
clearer picture of the formation process in this galaxy.  The proposed observations
will reveal the distribution of star-forming regions and emission line gas, and the
relationship between them, on a 1 kpc scale, as well as their relationship to the
radio source structure.
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9. Est obs time (hours) pri: 14.01    par: 0       10. Num targs pri: 1      par: 0
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11. Instruments requested:  WF/PC
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                                                                  Page   2
I. GENERAL FORM    Proposal 5470
PI:  Peter R Eisenhardt
Proposal Title:
WFPC2 IMAGING OF THE PROTOGALAXY CANDIDATE B2 0902+34
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1. Proposers:
Proposers                        Institution                       Country       ESA
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 Peter R Eisenhardt              2370                              USA
 Simon Lilly                     4664                              CANADA
 Nanyao Y Lu                     2370                              USA
 Mark Dickinson                  3470                              USA
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  3. Description of proposed observations.
  We propose to use WFPC2 to 5.5 hours of integration with the Planetary Camera
 and F622W to measure the rest frame UV continuum in B2 0902+34. We also propose
 to obtain a total of 6.1 hours of integration with the linear ramp filter,
 centering B2 0902+34 at the 5341 Angstrom position on the WF4 array, to measure
 the redshifted Ly alpha morphology. The total integration times of 19800 seconds
 through F622W and 22000 seconds through the LRG will each be broken into three
 groups of 3 to 4 2200 second exposures each. We use 2200 seconds as our estimate
 for the maximum available unocculted time per orbit, but because all of our
 observations will be read-noise limited, we hope that the actual per orbit
 exposure time can be adjusted to its maximum allowable length (within the
 constraint of the total spacecraft time allocation) in order to maximize our
 resulting S/N.  The multiple exposures (3 to 4) taken within each FGS lock
 position will suffice to allow cosmic ray removal, thus we set CRSPLIT=NO.
 Between each FGS lock position, we plan to reposition the object by approx. 0.5
 arcsec using POS TARG specifications in order to avoid bad pixels.  The exposures
 taken through each filter should be obtained on consecutive orbits.
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  4. Justification of need for HST observations.
  Figure 2 of section 2 of our Phase I proposal illustrates deep (hours of KPNO 4m
 time) subarcsec imaging in narrow and broadband filters of B2 0902+34. We have
 also obtained deep optical and near IR spectra, which confirm the corrections for
 line  emssion to the continuum flux, and result in a flat, line-free continuum
 characteristic of a protogalaxy. Both the flat (young) SED and figure 2 suggest
 there is complex structure within the central 2 " of the source, corresponding to
 roughly 14 kpc. Detecting whether there are two subcomponents or many (many
 subcomponents are plausible for a dynamically young object) requires
 significantly better spatial resolution than Figure 2 provides, or is currently
 feasible from the ground, while HST's ability to resolve 1kpc scales is well
 matched to the expected substructure. We will propose to obtain space IR
 measurements of this object from ISO and SIRTF, when they become available.
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  9. Description of previous HST work.
  4575 "WF/PC Observations of the Most Luminous Galaxy in the Universe; the IRAS
 Source FSC 10214+4724", Peter Eisenhardt coI 1229 - "OPTICAL AND ULTRAVIOLET
 IMAGING OF LARGE REDSHIFT RADIO GALAXIES " S.Lilly coI 2365 - "HST IMAGING OF
 GROUND-BASED ULTRA-DEEP SURVEY FIELDS Simon J. Lilly PI 2684-KP - "HST MEDIUM-
 DEEP SURVEY: CYCLE 1 OBSERVATIONS S.Lilly coI (continuations in 4018, 4029, 4105,
 4106) 2695 - "MORPHOLOGY OF PKS 1614+051, A QUASAR-GALAXY PAIR AT Z=3.21
 M.Dickinson coI 2698 - "LYMAN-ALPHA IMAGING OF YOUNG AND FORMING GALAXIES AT
 LARGE REDSHIFTS " M.Dickinson coI 3543 - "THE DEEP ULTRAVIOLET SKY ", Simon J.
 Lilly PI 3654 - "HIGH RESOLUTION MORPHOLOGIES AND COLORS IN DISTANT RADIO
 GALAXIES "M.Dickinson coI None are directly related to this proposal. No results
 have yet been published.
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 10. Resources to be supplied by investigator's institution(s).
  Sun workstations at JPL, U of Toronto, and UC Berkeley. However we expect to
 need one additional SPARCstation LX and 1GB disk drive and have budgeted 50% of
 this cost to STScI, with the remainder coming from JPL funds. Op We have
 IRAF/SDAS installed and have developed numerous software routines relevant to the
 data reduction and analysis which we will apply (see Section 7.)
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11. Address Information
Name:  Peter R Eisenhardt                                  Category: PI
Institution: 2370
Address:  MS 169-327
          Jet Propulsion Laboratory
          4800 Oak Grove Drive
City: Pasadena                                  State: CA
Zip Code: 91109                                 Country: USA
Telephone: 818-354-4395
Telex (or e-mail): prme@kromos.jpl.nasa.gov
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Name:                                                      Category: CON
Institution:
Address:
City:                                           State:
Zip Code:                                       Country:
Telephone:
Telex (or e-mail):
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TARGET LIST    a) Fixed Targets                                                                    ID = 5470             [  4]
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 1 |     2      |           3           |              4             |  5     |   6    |  7  |              8
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Tar|   Target   |         Target        |            Target          |Coord   | Radial |Acqui|FLX|     Flux data
No |    Name    |       Description     |           Position         |Eqnx    |  Vel.  |Prblm|REF|
   |            |                       |                            |        |        |     |   |
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1   B20902+34    E,315,322,325           RA = 9H 2M 24.80S +/- 0.03S, 1950     Z =            1   R=28.5
                                         DEC = +34D 19' 57.0" +/-              3.395          2   F-LINE(5342)=30 +/- 5 E-18
                                         0.3"
     Comments: OBSERVED R AND 5342 FLUXES 100 TIMES
             LARGER BUT EXTENDED OVER SEVERAL ARCSEC.
             GOAL IS S/N=5 ON UNRESOLVED STRUCTURES
             WITH 1% OF OBSERVED TOTAL FLUXES. OUR
             GROUNDBASED IMAGES SHOW MUCH SUBSTRUCTURE
             IN THIS OBJECT.
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EXPOSURE LOGSHEET                                                                                  ID = 5470             [  5]
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 1      |   2   |      3    |  4   |   5   |   6   |    7   |   8   |       9       |10 |   11  |   12    |13 |14|        15
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  Line  |  Seq  |   Target  |Instr | Oper. | Aper  |Spectral|Central|   Optional    |Num|  Time |   S/N   |Flx|Pr|     Special
 Number | Name  |    Name   |Config| Mode  |or FOV |Element |Waveln.|  Parameters   |Exp|       |Rel. Time|Ref|  |   Requirements
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1                B20902+34   WFPC2  IMAGE   PC1     F622W            CR-SPLIT=NO     1   2100.00 5         1   1  SEQ 1.0-1.5 NO GAP
                                                                                                 18000S           POS TARG +0.00,
                                                                                                                  +0.00
                                                                                                                  CYCLE 4 / 1.0-3.5
                                                                                                                  SAME ORIENT FOR
                                                                                                                  1.5-3.5 AS 1.0
     Comments: ADJUST EXP TIME +INFINITY/-10%                                                                     GROUP 1.0-3.5
               TO FIT IN AN ALIGNMENT. 3 EXP/                                                                     WITHIN 20D
               POS FOR CR DETECTION,
               UNINTERRUPTED EXPOSURES NEEDED
               TO ACHIEVE DESIRED S/N.
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1.5              B20902+34   WFPC2  IMAGE   PC1     F622W            CR-SPLIT=NO     2   2400.00 5         1   1  SAME POS FOR 1.5
                                                                                                 18000S           AS 1.0
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2                B20902+34   WFPC2  IMAGE   PC1     F622W            CR-SPLIT=NO     1   2400.00 5         1   1  POS TARG +0.322,
                                                                                                 18000S           +0.322
                                                                                                                  SEQ 2.0-2.5 NO GAP
     Comments: ADJUST EXP TIME +INFINITY/-10%
               TO FIT IN AN ALIGNMENT. SECOND
               POS TO AVOID PATTERN NOISE. FOR
               ALL 3 POS USE SAME OPTIMUM
               CENTER BUT NOTE THAT POS TARG
               REQT DOES NOT IMPLY A NEED FOR
               ABSOLUTE POINTING ACCURACY < 1"
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2.5              B20902+34   WFPC2  IMAGE   PC1     F622W            CR-SPLIT=NO     2   2400.00 5         1   1  SAME POS FOR 2.5
                                                                                                 18000S           AS 2.0
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3                B20902+34   WFPC2  IMAGE   PC1     F622W            CR-SPLIT=NO     1   2400.00 5         1   1  POS TARG +0.460, -
                                                                                                 18000S           0.138
                                                                                                                  SEQ 3.0-3.5 NO GAP
     Comments: ADJUST EXP TIME +INFINITY/-10%
               TO FIT IN AN ALIGNMENT. THIRD
               POS TO AVOID BLEMISHES
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3.5              B20902+34   WFPC2  IMAGE   PC1     F622W            CR-SPLIT=NO     2   2400.00 5         1   1  SAME POS FOR 3.5
                                                                                                 18000S           AS 3.0
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            Summary Form for Proposal 5470                                                                               [  6]

  Item                          Used in this proposal
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  Configurations                WFPC2
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  Opmodes                       IMAGE
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  Optional Parameters           CR-SPLIT
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  Proposal for                  GO
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  S/C Hours                     14.01
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  Scientific Category           GALAXIES & CLUSTERS
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  Scientific Sub-category       DISTANT GALAXIES
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  Special Requirements          SEQ 1.0-1.5 NO GAP; POS TARG +0.00, +0.00; CYCLE 4 / 1.0-3.5; SAME ORIENT FOR 1.5-3.5 AS 1.0;
                                GROUP 1.0-3.5 WITHIN 20D SAME POS FOR 1.5 AS 1.0 POS TARG +0.322, +0.322; SEQ 2.0-2.5 NO GAP SAME
                                POS FOR 2.5 AS 2.0 POS TARG +0.460, -0.138; SEQ 3.0-3.5 NO GAP SAME POS FOR 3.5 AS 3.0
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  Spectral Elements             F622W
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  Target Names                  B20902+34
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