6557( 7) - 05/19/98 13:43 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6557 Version: 7 Check-in Date: 19-May-1998 13:41:59 1.Proposal Title: WFPC2 Imaging of Intermediate Redshift Absorption-Selected Galaxies ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 6 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Charles Steidel California Institute of Technology CoI: Mark Dickinson Space Telescope Science Institute N CoI: Kurt Adelberger California Institute of Technology N ------------------------------------------------------------------------------------ 5. Abstract We propose to continue using WFPC2 to obtain high resolution images of 0.3 <= z <= 1.0 galaxies taken from a survey selected by diffuse gas cross-section rather than apparent magnitude. The implications of our survey are that large, roughly spherical gaseous halos are a generic property of all relatively massive (L_K > 0.05L_K^* )galaxies, and that the nature of these envelopes is more closely related to galaxy mass than to current star formation rate or spectroscopic type. The aim of our proposed observations is to use a representative subset of our sample in order 1) to test directly whether the absorbers represent the full range in normal Hubble sequence morphological types (as suggested by the ground--based spectra and colors) 2) to confirm whether the statistical inference of roughly spherical gas distributions is correct by examining whether, e.g., galaxy inclination angle is related to the nature of the absorption, 3) to verify that the galaxies identified as the absorbers are indeed the most likely candidates by searching for previously undetected faint companions very near the QSO line of sight, and 4) to obtain crucial morphological and sky--orientation information that can be combined with our existing ground-- based data and with planned high resolution spectroscopy of the background QSOs to obtain a complete picture of the interrelationship between morphological type, impact parameter, star formation rate, and the gas--phase geometry, kinematics, physical conditions, and chemical abundances. ------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 2] Observations Description ------------------------ For reasons stated in the justification, we will use the filter F702W for all of the observations. The apparent AB magnitudes of the galaxies of interest, at the wavelength of F702W, range from 19.7 to 24.0. We are using the same observational strategy (which has proved successful) adopted in our Cycle 5 program with the same scientific aims. The QSOs in each field range in magnitude from 16.5 to 19.5; these will saturate the CCD in a typical individual exposure of ~1200 seconds, and produce moderate blooming (several pixels) on the WFC CCDs; however, the typical galaxy separation from the QSO is ~4 arcsec, so that this will not adversely affect the objects of interest. Nevertheless, it will in some cases be important to have a well-defined PSF with which to model the QSO light profile, so we have planned to place the QSO in the same position (WF3-FIX) for each of the 12 fields; absolute ORIENT ranges have been specified which guarantee that objects of primary interest will not fall beneath diffraction spikes from the QSO, and so as to place absorbing galaxies evenly throughout the 4 azimuthal ``quadrants'' of the PSF. This will allow us to produce a very good PSF at exactly the position of interest on the chip, using all of the observations together. We have chosen not to use the PC because of the substantial penalty in read noise and the larger amount of scattered light in the PSF wings. Our general approach for each field is to obtain 2 separate CR-split exposures (typical integration of 1200-1300s per actual read--out), with the second one being at a position dithered by a fractional pixel (+ an integer number of pixels) relative to the first, thereby allowing us to achieve slightly better sampling of the data. There is a total of 15 absorbing galaxies in the 12 fields proposed; these have been carefully selected to span the full range in absolute magnitude, impact parameter, and spectroscopic type from our ground--based survey. A reasonably large number of fields is required in order to make general statements about the nature of the galaxy halos as a function of other observed galaxy properties. As stated below, these images will also complement a comprehensive extension of our ground--based survey to include wider-ranging multi--object faint galaxy spectroscopy and high--resolution QSO spectroscopy in the same fields. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 Q0058-FIELD GALAXY RA=01H 00M 54.1S +/- 0.1S, J2000 z=0.613 R = 23.3 DEC=02D 11' 37.0" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 2 Q0150-FIELD GALAXY RA=01H 52M 27.3S +/- 0.1S, DEC=- J2000 z=0.780 R = 22.3 20D 01' 07.3" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 3 Q0229-FIELD GALAXY RA=02H 31M 46.0S +/- 0.1S, J2000 z=0.417 R = 20.21 DEC=13D 22' 54.6" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 4 Q0836-FIELD GALAXY RA=08H 39M 33.0S +/- 0.1S, J2000 z=0.787 R = 22.71 DEC=11D 12' 08.43" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 5 Q0843-FIELD GALAXY RA=08H 45M 47.3S +/- 0.1S, J2000 z=0.605 R = 23.5 DEC=13D 28' 58.23" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 6 Q1019-FIELD GALAXY RA=10H 22M 30.3S +/- 0.1S, J2000 z=0.346 R = 20.8 DEC=30D 41' 04.87" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 7 Q1254-FIELD GALAXY RA=12H 56M 59.9S +/- 0.1S, J2000 z=0.519 R = 23.4 DEC=04D 27' 34.0" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 8 Q1241-FIELD GALAXY RA=12H 44M 10.8S +/- 0.1S, J2000 z=0.550 R = 21.9 DEC=17D 21' 04.0" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 9 Q1332-FIELD GALAXY RA=13H 34M 11.67S +/- 0.1S, J2000 z=0.374 R = 19.7 DEC=55D 01' 25.5" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 10 Q1511-FIELD GALAXY RA=15H 13M 29.3S +/- 0.1S, J2000 z=0.0.43 R = 21.6 DEC=10D 11' 06.0" +/- 1" 7 Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 11 Q1623-FIELD GALAXY RA=16H 25M 48.77S +/- 0.1S, J2000 z=0.889 R = 22.4 DEC=26D 46' 59.9" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 12 Q2206-FIELD GALAXY RA=22H 08M 52.1S +/- 0.1S, DEC=- J2000 z=0.759 R = 22.5 19D 43' 59.4" +/- 1" Comments: High redshift galaxy producing absorption in the spectrum of the background QSO. 6557( 7) - 05/19/98 13:43 - [ 4] Visit: 01 Visit Priority: Visit Requirements: ORIENT 33D TO 63D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q0058-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q0058-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 5] Visit: 02 Visit Priority: Visit Requirements: ORIENT 68D TO 95D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q0150-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q0150-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 6] Visit: 03 Visit Priority: Visit Requirements: ORIENT 68D TO 100D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q0229-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q0229-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 7] Visit: 04 Visit Priority: Visit Requirements: ORIENT 85D TO 90D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q0836-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q0836-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 8] Visit: 05 Visit Priority: Visit Requirements: ORIENT 87D TO 106D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q0843-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q0843-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 9] Visit: 06 Visit Priority: Visit Requirements: ORIENT 96D TO 116D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q1019-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q1019-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 10] Visit: 07 Visit Priority: Visit Requirements: ORIENT 100D TO 110D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q1254-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q1254-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 3 Q1254-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG +0,+0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 11] Visit: 08 Visit Priority: Visit Requirements: ORIENT 107D TO 135D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q1241-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q1241-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 12] Visit: 09 Visit Priority: Visit Requirements: ORIENT 194D TO 219D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q1332-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2500 S EXPAND GS ACQ SCENARIO SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 13] Visit: 10 Visit Priority: Visit Requirements: ORIENT 265D TO 300D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q1511-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q1511-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 14] Visit: 11 Visit Priority: Visit Requirements: ORIENT 180D TO 200D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q1623-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S ------------------------------------------------------------------------------------------------------------------------------------ 2 Q1623-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 15] Visit: 12 Visit Priority: Visit Requirements: ORIENT 248D TO 270D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q2206-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q2206-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 16] Visit: 52 Visit Priority: Visit Requirements: ORIENT 68D TO 95D On Hold Comments: Additional Comments: copy of failed visit 02 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q0150-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2200 S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 Q0150-FIELD WFPC2 IMAGE WF3-FIX F702W 1 2400 S EXPAND POS TARG -0.75, +0.75 ------------------------------------------------------------------------------------------------------------------------------------ 6557( 7) - 05/19/98 13:43 - [ 17] Summary Form for Proposal 6557 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WF3-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 33D TO 63D EXPAND EXPAND POS TARG -0.75,+0.75 ORIENT 68D TO 95D ORIENT 68D TO 100D ORIENT 85D TO 90D ORIENT 87D TO 106D ORIENT 96D TO 116D ORIENT 100D TO 110D EXPAND POS TARG +0,+0.75 ORIENT 107D TO 135D ORIENT 194D TO 219D EXPAND GS ACQ SCENARIO SINGLE ORIENT 265D TO 300D ORIENT 180D TO 200D ORIENT 248D TO 270D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F702W ------------------------------------------------------------------------------------------------------------------------------------ Target Names Q0058-FIELD Q0150-FIELD Q0229-FIELD Q0836-FIELD Q0843-FIELD Q1019-FIELD Q1254-FIELD Q1241-FIELD Q1332-FIELD Q1511-FIELD Q1623-FIELD Q2206-FIELD ------------------------------------------------------------------------------------------------------------------------------------