! Proposal 6619, submission 1
! PI: Kenneth M. Lanzetta
! Received Sat Feb  3 02:59:03 EST 1996
! From: hchen@sbast3.ess.sunysb.edu
Proposal_Information

              Title:  High-Resolution Images of QSO Lyman-alpha
                      Absorbing Galaxies
  Proposal_Category:  GO
Scientific_Category:  QSO Absorption Lines
             Cycle:    6

Investigators

           PI_name:   Kenneth M. Lanzetta
    PI_Institution:   State University of New York at Stony Brook

          CoI_Name:   John K. Webb
   CoI_Institution:   University of New South Wales
           Contact:   N

          CoI_Name:   Xavier Barcons
   CoI_Institution:   Instituto de Fi sica de Cantabria
           Contact:   N

          CoI_Name:   Hsiao--Wen Chen
   CoI_Institution:   University of Illinois
           Contact:   N


Abstract:

    Combining HST spectra of QSOs with ground-based spectroscopy
    of faint galaxies, we have been pursuing a program to directly
    identify the objects responsible for low- and intermediate-
    redshift QSO Ly-alpha\ absorption systems. Our results suggest
    that a significant fraction of intermediate-redshift Ly-alpha\
    absorbers arise in very extended gaseous regions around
    galaxies.  However, with existing ground-based images we are
    unable to clearly resolve the galaxies we identify.  Thus we
    cannot tell how QSO absorption characteristics depend on
    galaxy morphological type, structural parameters, or angular
    inclinations and orientations.  Here we propose to obtain high
    -resolution WFPC2 images of carefully selected fields centered
    on HST target QSOs.  We will then have the exciting
    possibility of carrying out detailed studies of specific
    galaxies that are already known to be associated with specific
    QSO absorption systems. For the first time, it will be
    possible to learn how the QSO absorption characteristics
    relate to galaxy morphological type, what the gaseous geometry
    of those galaxies is, and how the inclination and orientation
    of the galaxy with respect to the QSO line of sight affect the
    absorption properties.

Questions

Observing_Description:

    We plan to acquire high-resolution images of galaxies using
    WFPC2 with the 702W filter.  The galaxies of interest have
    total magnitudes in the range R ~ 18.5 - 22.0 and redshifts
    in the range z ~ 0.05 - 0.7.  Each field contains between
    five and 22 ``interesting'' galaxies, with an average of nine
    interesting galaxies per field.  Most of the interesting
    galaxies can be observed in a single 2.5 * 2.5 arcmin^2 WFPC2
    frame.  Orientations of the exposures will be chosen to
    include as many interesting galaxies as possible. Our
    previous experience indicates that images acquired in one
    orbit (with exposures of three times 600 s and no dithering)
    are sufficient to yield accurate measurements of morphology,
    disk and bulge effective radii and central surface
    brightnesses, disk-to-bulge ratios, and angular inclinations
    and orientations for the galaxies of our sample.
    Specifically, we find that images acquired in one orbit are
    sufficient to distinguish exponential disk from r^1/4 bulge
    surface brightness profiles, to determine disk and bulge
    effective radii to within typically ~ 0.1 arcsec, and to
    determine angular inclinations and orientations to within
    typically ~ 0.5 degree. We request 14 images over 14 orbits
    in order to complete our sample of 23 fields.  A sample of
    this size is required to derive statistically meaningful
    results and to make full use of the potential of the existing
    ground-based observations. Each field is centered on a bright
    (V ~ 16) QSO, but at an exposure time of 600 s per exposure
    we calculate that only the central five pixels or so will be
    saturated.

Real_Time_Justification:

Calibration_Justification:

Additional_Comments:

Fixed_Targets

  Target_Number: 1
    Target_Name: FIELD-004705+031957
    Description: GALAXY,QSO
       Position: RA = 00H 47M 04.37S +/- 0.07S,
                 DEC = +3D 19' 32.1" +/- 1.0",
                 PLATE-ID=04YC
        Equinox: 2000
        RV_or_Z: Z=0.624
           Flux: V = 16.00 +/- 0.5
       Comments: POINTING POSITION IS 20 ARCSEC WEST AND 25 ARCSEC SOUTH
		 OF THE QSO 0044+0303

  Target_Number: 2
    Target_Name: FIELD-012528-000555
    Description: GALAXY,QSO
       Position: RA = 01H 25M 29.5S +/- 0.07S,
                 DEC = -00D 06' 15.8" +/- 1.0",
                 PLATE-ID=00WT
        Equinox: 2000
        RV_or_Z: Z=1.070
           Flux: V = 16.70 +/- 0.5,
                 B-V = 0.28 +/- 0.1
       Comments: POINTING POSITION IS 10 ARCSEC EAST AND 20 ARCSEC SOUTH
		 OF THE QSO 0122-0023

  Target_Number: 3
    Target_Name: FIELD-040748-121136
    Description: GALAXY,QSO
       Position: RA = 04H 07M 50.74S +/- 0.07S,
                 DEC = -12D 13' 01.2" +/- 1.0",
                 PLATE-ID=0238
        Equinox: 2000
        RV_or_Z: Z=0.574
           Flux: V = 15.35 +/- 0.5,
                 B-V = 0.18 +/- 0.1
       Comments: POINTING POSITION IS 35 ARCSEC EAST 85 ARCSEC SOURTH
		 OF THE QSO 0405-1219

  Target_Number: 4
    Target_Name: QSO-040748-121136
    Description: GALAXY,QSO
       Position: RA = 04H 07M 47.02S +/- 0.07S,
                 DEC = -12D 11' 30.9" +/- 1.0",
                 PLATE-ID=0238
        Equinox: 2000
        RV_or_Z: Z=0.574
           Flux: V = 15.35 +/- 0.5,
                 B-V = 0.18 +/- 0.1
       Comments: POINTING POSITION IS 20 ARCSEC WEST 5 ARCSEC NORTH
		 OF THE QSO 0405-1219

  Target_Number: 5
    Target_Name: FIELD-063546-751617
    Description: GALAXY,QSO
       Position: RA = 06H 35M 45.36S +/- 0.07S,
                 DEC = -75D 15' 46.9" +/- 1.0",
                 PLATE-ID=0095
        Equinox: 2000
        RV_or_Z: Z=0.656
           Flux: V = 15.75 +/- 0.5,
                 B-V = 0.33 +/- 0.1
       Comments: POINTING POSITION IS 5 ARCSEC WEST AND 30 ARCSEC NORTH
		 OF THE QSO 0637-7513

  Target_Number: 6
    Target_Name: FIELD-090631+164611
    Description: GALAXY,QSO
       Position: RA = 09H 06M 32.61S +/- 0.07S,
                 DEC = +16D 46' 31.5" +/- 1.0",
                 PLATE-ID=0204
        Equinox: 2000
        RV_or_Z: Z=0.411
           Flux: V = 18.27 +/- 0.5,
                 B-V = 0.21 +/- 0.1
       Comments: POINTING POSITION IS 10 ARCSEC EAST AND 20 ARCSEC NORTH
		 OF THE QSO 0903+1658
  
  Target_Number: 7
    Target_Name: FIELD-113910-135043
    Description: GALAXY,QSO
       Position: RA = 11H 39M 9.33S +/- 0.07S,
                 DEC = -13D 50' 23.3" +/- 1.0",
                 PLATE-ID=03YF
        Equinox: 2000
        RV_or_Z: Z=0.557
           Flux: V = 16.08 +/- 0.5,
                 B-V = 0.07 +/- 0.1
       Comments: POINTING POSITION IS 20 ARCSEC WEST AND 20 ARCSEC NORTH
		 OF THE QSO 1136-1334
          
  Target_Number: 8
    Target_Name: QSO-121920+063840
    Description: GALAXY,QSO
       Position: RA = 12H 19M 19.860S +/- 0.07S,
                 DEC = +06D 39' 10.10" +/- 1.0"
        Equinox: 2000
        RV_or_Z: Z=0.334
           Flux: V = 15.68 +/- 0.5
       Comments: POINTING POSITION IS 15 ARCSEC WEST AND 30 ARCSEC NORTH
		 OF THE QSO 1216+0655

  Target_Number: 9
    Target_Name: FIELD-121920+063840
    Description: GALAXY,QSO
       Position: RA = 12H 19M 21.54S +/- 0.07S,
                 DEC = +06D 38' 10.10" +/- 1.0",
                 PLATE-ID=019S
        Equinox: 2000
        RV_or_Z: Z=0.334
           Flux: V = 15.68 +/- 0.5
       Comments: POINTING POSITION IS 10 ARCSEC EAST AND 30 ARCSEC SOUTH
		 OF THE QSO 1216+0655

  Target_Number: 10
    Target_Name: QSO-130112+590206
    Description: GALAXY,QSO
       Position: RA = 13H 01M 12.27S +/- 0.07S,
                 DEC = +59D 02' 31.6" +/- 1.0",
                 PLATE-ID=01R2
        Equinox: 2000
        RV_or_Z: Z=0.472
           Flux: V = 15.60 +/- 0.5
       Comments: POINTING POSITION IS 5 ARCSEC WEST AND 25 ARCSEC NORTH
		 OF THE QSO 1259+5918

  Target_Number: 11
    Target_Name: FIELD-130112+590206
    Description: GALAXY,QSO
       Position: RA = 13H 01M 14.22S +/- 0.07S,
                 DEC = +59D 01' 51.6" +/- 1.0",
                 PLATE-ID=01R2
        Equinox: 2000
        RV_or_Z: Z=0.472
           Flux: V = 15.60 +/- 0.5
       Comments: POINTING POSITION IS 10 ARCSEC EAST AND 15 ARCSEC SOUTH
		 OF THE QSO 1259+5918

  Target_Number: 12
    Target_Name: FIELD-142738-120350
    Description: GALAXY,QSO
       Position: RA = 14H 27M 38.17S +/- 0.07S,
                 DEC = -12D 03' 50.4" +/- 1.0",
                 PLATE-ID=015S
        Equinox: 2000
        RV_or_Z: Z=0.806
           Flux: V = 16.49 +/- 0.5,
                 B-V = 0.42 +/- 0.1
       Comments: POINTING POSITION IS AT THE QSO 1424-1150

  Target_Number: 13
    Target_Name: FIELD-164258+394836
    Description: GALAXY,QSO
       Position: RA = 16H 42M 55.36S +/- 0.07S,
                 DEC = +39D 48' 31.6" +/- 1.0",
                 PLATE-ID=00CL
        Equinox: 2000
        RV_or_Z: Z=0.595
           Flux: V = 15.96 +/- 0.5,
                 B-V = 0.29 +/- 0.1
       Comments: POINTING POSITION IS 40 ARCSEC WEST AND 5 ARCSEC SOUTH 
		 OF THE QSO 1641+3954

  Target_Number: 14
    Target_Name: FIELD-225357+160853
    Description: GALAXY,QSO
       Position: RA = 22H 53M 58.170S +/- 0.07S,
                 DEC = +16D 09' 06.05" +/- 1.0",
                 PLATE-ID=00GO
        Equinox: 2000
        RV_or_Z: Z=0.859
           Flux: V = 16.10 +/- 0.5,
                 B-V = 0.47 +/- 0.1
       Comments: POINTING POSITION IS AT THE QSO 2251+1552

Visits

        Visit_Number: 1
  Visit_Requirements: ORIENT 185D TO 225D

     Exposure_Number: 1
         Target_Name: FIELD-004705+031957
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

        Visit_Number: 2
  Visit_Requirements: ORIENT 0D TO 48D

     Exposure_Number: 2
         Target_Name: FIELD-012528-000555
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

        Visit_Number: 3
  Visit_Requirements: ORIENT 270D TO 292D; SCHED 50%
 
     Exposure_Number: 3
         Target_Name: FIELD-040748-121136
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

        Visit_Number: 4
  Visit_Requirements: ORIENT 248D TO 300D; SCHED 50%
 
     Exposure_Number: 4
         Target_Name: QSO-040748-121136
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

        Visit_Number: 5
  Visit_Requirements: ORIENT 170D TO 183D; SCHED 60%

     Exposure_Number: 5
         Target_Name: FIELD-063546-751617
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

        Visit_Number: 6
  Visit_Requirements: ORIENT 210D TO 274D

     Exposure_Number: 6
         Target_Name: FIELD-090631+164611
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

        Visit_Number: 7
  Visit_Requirements: ORIENT 124D TO 186D

     Exposure_Number: 7
         Target_Name: FIELD-113910-135043
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:
 
        Visit_Number: 8
  Visit_Requirements: ORIENT 61D TO 112D

     Exposure_Number: 8
         Target_Name: QSO-121920+063840
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 700S
Special_Requirements:
            Comments:

        Visit_Number: 9
  Visit_Requirements: ORIENT 175D TO 260D; SCHED 40%

     Exposure_Number: 9
         Target_Name: FIELD-121920+063840
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 700S
Special_Requirements:
            Comments:

        Visit_Number: 10
  Visit_Requirements: ORIENT 315D TO 343D; SCHED 40%

     Exposure_Number: 10
         Target_Name: QSO-130112+590206
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

        Visit_Number: 11
  Visit_Requirements: ORIENT 211D TO 270D; SCHED 40%

     Exposure_Number: 11
         Target_Name: FIELD-130112+590206
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

        Visit_Number: 12
  Visit_Requirements: ORIENT 286D TO 315D
 
     Exposure_Number: 12
         Target_Name: FIELD-142738-120350
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:
 
        Visit_Number: 13
  Visit_Requirements: ORIENT 68D TO 87D; SCHED 50%

     Exposure_Number: 13
         Target_Name: FIELD-164258+394836
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

        Visit_Number: 14
  Visit_Requirements: ORIENT 45D TO 135D

     Exposure_Number: 14
         Target_Name: FIELD-225357+160853
              Config: WFPC2
              Opmode: IMAGE
            Aperture: WF3-FIX
          Sp_Element: F702W
          Wavelength: 7020
 Optional_Parameters: ATD-GAIN = 7, CLOCKS = NO, CR-SPLIT = NO
Number_of_Iterations: 3
   Time_Per_Exposure: 750S
Special_Requirements:
            Comments:

Data_Distribution

         Medium: 8MM
Blocking_Factor: 10
        Ship_To: Department of Earth and Space Sciences
                 State University of New York at Stony Brook
                 Stony Brook, NY 11794-2100
       Ship_Via: UPS