5970( 8) - 08/03/95 19:11 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5970 Version: 8 Check-in Date: ********** 1.Proposal Title: Exploring the Morphology of Cluster Galaxies at Redshift z=3.4 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Galaxies & Clusters GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Mauro Giavalisco Space Telescope Science Institute CoI: Duccio Macchetto Space Telescope Science Institute N CoI: Piero Madau Space Telescope Science Institute N CoI: William Sparks Space Telescope Science Institute N CoI: Charles Steidel Massachussets Insitute of Technology N CoI: Alexander Szalay The Johns Hopkins University N ------------------------------------------------------------------------------------ 6. Abstract Primeval galaxies are systems in the process of forming their first stellar populations. Despite intensive searches over more than a decade, the population of primeval galaxies has not been found and we remain essentially ignorant, from an empirical point of view, as to the early phases of galaxy formation and evolution. In view of this, we propose to obtain images with the WFPC2 of two radio-quiet, star -forming galaxies at z=3.4 that we have identified in the field around Q0000-263, and of another 14 z=3.4 galaxy candidates. The two galaxies with confirmed redshifts are very likely a nascent spheroidal system with relatively intense Ly-alpha\ emission, and a disc galaxy producing the damped Ly-alpha\ absorption in the spectrum of the QSO, respectively. The latter 14 galaxies have identical SEDs to the two with known redshift, and are also spatially clustered with them at the 98.8\ be the most distant group or cluster of galaxies thus far identified. We propose the F702W filter to study the rest-frame UV light of the 16 galaxies in a spectral region that at z=3.4 corresponds to ~ 1600 Angstrom. This study is aimed at elucidating the morphology of the star-forming regions of two confirmed z=3.4 galaxies, probing the existence of the structural components such as disk and bulge, and at establishing the general morphological properties of the cluster candidates in comparison with other similarly faint (but foreground) galaxies in the field. ------------------------------------------------------------------------------------ 5970( 8) - 08/03/95 19:11 - [ 2] Observations Description ------------------------ The proposed observations consist of WFPC2 imaging of the field around Q0000- 263 through the F702W passband with a total integration time of 15 hours or 24 orbits. Targets of the program are 16 galaxies with magnitudes in the interval 24<\cal R<25.5 (our customized \cal R filter, intermediate between the Johnson R and I, is quite similar to the F702W). These galaxies are distributed within an area of about 2.5x2.5 arcmin^2 and, with the exception of two of them, they can all be accomodated in the WFPC2 field with a proper orientation of the telescope. One of these galasies cause a damped Lyman-alpha/Lyman-limit absorption system in the spectrum of QSO 0000-263, which has V~18.6 and it is placed at about 2.5 arcsec from it. We will put the QSO with the absorbing galaxy in the PC chip. We want each exposure about 20 minute long, which avoids strong saturation of the QSO. After each exposure the telescope will be stepped by a few pixels both in RA and DEC (integer pixel shift). Due to uncertainty in the magnitude of the QSO in the F702W filter, we set CLOCKS=YES we minimize the effects of saturation. Also, we do not need CRSPLIT because we will have enough exposures to allow a proper subtraction of cosmic rays. Real Time Justification ----------------------- None. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5970( 8) - 08/03/95 19:11 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-000328- CLUSTER OF GALAXIES, RA=00H 03M 23.23S +/- 0.01S, J2000 Z = 3.4 U-V = 36.0 E-1 260354 HIGH REDSHIFT CLUSTER DEC=-26D 03' 06.7" +/- 0.1" V-R = 30.0 E-2 (z>0.5), GALAXY, U = 27.5 STARBURST, LYMAN ALPHA V = 23.9 R = 24.2 U-V = 25.0 E-1 V-R = 5.0 E-1 U = 27.5 V = 25.0 Comments: Very high galactic latitude field with b~-79. With the R = 24.5 exception of a QSO with V~18.6, there are no bright stars in this field. The brightest galaxy has V~20. The QSO is at z=4.11. The galaxy causing the damped system of the QSO is at z=3.390, and the Lyman-alpha galaxy is at z=3.428. 5970( 8) - 08/03/95 19:11 - [ 4] Visit: 01 Visit Requirements: ORIENT 295.26D to 295.26D GROUP 1-2 WITHIN 21D On Hold Comments: Additional Comments: INCREASE EXPOSURE TIME TO FILL THE ORBIT. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2200S 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG +0.50, 0.00 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG +0.50, -0.50 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG 0.00, -0.50 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 5 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG -0.50, -0.50 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 6 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG -0.50, 0.00 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 5970( 8) - 08/03/95 19:11 - [ 5] Visit: 02 Visit Requirements: SAME ORIENT AS 01 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 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2200S POS TARG -0.50, +0.50 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG 0.00, +0.50 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG +0.50, +0.50 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG +1.00, 0.00 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 5 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG +1.00, -0.50 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 6 GAL-000328- WFPC2 IMAGE PC1-FIX F702W CLOCKS=YES CR- 1 2300S POS TARG +1.00, +0.50 260354 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 5970( 8) - 08/03/95 19:11 - [ 6] Summary Form for Proposal 5970 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CLOCKS=YES CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Galaxies & Clusters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 295.26D to 295.26D GROUP 1-2 WITHIN 21D POS TARG +0.50, 0.00 POS TARG +0.50, -0.50 POS TARG 0.00, -0.50 POS TARG -0.50, -0.50 POS TARG -0.50, 0.00 SAME ORIENT AS 01 POS TARG -0.50, +0.50 POS TARG 0.00, +0.50 POS TARG +0.50, +0.50 POS TARG +1.00, 0.00 POS TARG +1.00, -0.50 POS TARG +1.00, +0.50 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F702W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GAL-000328-260354 ------------------------------------------------------------------------------------------------------------------------------------