Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5449 Report Date: 18-Jul-95:17:25 Version: ********** Check-in Date: ********** 1.Proposal Title: THE MORPHOLOGIES OF NORMAL GALAXIES AT HIGH REDSHIFTS: CYCLE 4 MEDIUM ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID GALAXIES & CLUSTERS GO Sub Category DISTANT GALAXIES ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Simon J Lilly 4664 CANADA (416) 978-5186 ------------------------------------------------------------------------------------ 7. Abstract We propose to obtain images at the highest possible resolution of a sample of normal galaxies at moderately high redshift that have been spectroscopically identified in a major ground- based survey program. Our HST program is aimed at PC observations of half a dozen galaxies at 0.6 < z < 0.8 and WFC observations of over 100 spectroscopically identified sources with I(AB) < 22.5 and with 0 < z < 1.2. The unique capabilities of HST will enable us to (a) determine bulge-to-disk ratios, (b) measure bulge and disk scale lengths and surface brightnesses, (c) identify compact companions and other evidence for interactions and mergers, and (d) detect structure such as spiral arms within disks so as to determine the nature of star-formation within normal high redshift galaxies. This will lead to an understanding of the evolution of the different morphological components in galaxies and, thus, an understanding of those physical process that have operated within and around typical galaxies and which have controlled their evolution since the time when the Universe was less than half of its present age. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 17.30 par: 0 10. Num targs pri: 4 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: WF/PC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5449 PI: Simon J Lilly Proposal Title: THE MORPHOLOGIES OF NORMAL GALAXIES AT HIGH REDSHIFTS: CYCLE 4 MEDIUM ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Simon J Lilly 4664 CANADA Francois Hammer 5468 FRANCE X Olivier Le Fevre 1640 USA David Schade 8014 UK X David Crampton 4628 CANADA Laurence Tresse 5468 FRANCE X Daniel Hudon 4664 CANADA ------------------------------------------------------------------------------------ 3. Description of proposed observations. For each of four fields (two within each of two large survey areas), six single orbit (i.e. 6x1800-second) exposures will be made with all of the three WF and single PC channels of the WFPC2. For each of the four pointings, the PC channel will be centered on a galaxy with I(AB) < 21.5 lying between 0.6 < z < 0.8. The WF channels will sample the surrounding regions which will contain around 20 spectroscopically identified objects with I(AB) < 22.5 and 0.0 < z < 1.2. Acquisition will be blind. There are no telescope roll-angle constraints since the placement of the WF fields relative to the PC is not critical. No CR-split will be required for the CCD exposures. A small offset between exposures specified with POS-TARG will be used to aid in the removal of detector artifacts from the data. The F702W filter is preferred over F814W because the former is free of emission lines for redshifts 0.45 < z < 0.65, whereas the latter has H_BETA and [OIII] 5007 for 0.4 < z < 0.75. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. This HST program forms part of a comprehensive study of normal galaxies at 0 < z < 1 that we are pursuing using the CFHT and other facilities. This program has two aspects: (a) PC imaging of a few representative galaxies in a well-defined redshift (0.6 < z < 0.8) and luminosity range (with spectra like present-day Sc galaxies), to obtain the very best possible images of these galaxies, and (b) WFC imaging of a much larger number of galaxies with measured redshifts 0 < z < 1 which will be an essentially random selection from our deep spectroscopic survey. The aim here is to examine the statistics of bulge to disk ratios, spheroid and disk parameters, the incidence of companions etc. Four pointings, giving seven PC targets and about 80 other galaxies in the WFC areas is the minimum required to give stistical validity to any of our conclusions, given that at least two parameters (redshift and luminosity) need to be carefully controlled in drawing statistical conclusions from the sample. The simulations presented in the scientific justification used the information in the WFPC2 handbook, and specifically: read-noise of 7 e; sky brightness of R = 22.67 arcsec^-2 giving 0.07 e/s in each WF pixel and 0.015 e/s in each PC pixel, and dark current of 0.02 e/s per pixel. A surface brightness of R = 22.7 mag arcsec^-2 (c.f. Figure 3) thus has a S/N per pixel of 16 (WF) and 6 (PC). At R = 26.2 mag arcsec^-2, appropriate for distant galaxies at a radius of about 1 arcsec, the S/N per pixel are 0.8 and 0.25 respectively. Azimuthal summation in 0.1 arcsec annuli would improve the S/N by factors of 8 and 16 respectively, leading to S/N in profiles of order 5 at these radii ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. These observations are background limited so dark time is required. Page 3 ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. No special calibration is required, but best possible F702W flat is required ------------------------------------------------------------------------------------ 8. Additional comments or special requests. There are no additional requirements. As noted above, F702W is much better than the "standard" F814W because it is not contaminated by emission lines for the key redshift range 0.45 < z < 0.65. ------------------------------------------------------------------------------------ 9. Description of previous HST work. P2365 Cycle 1 "HST imaging of ground-based ultra-deep survey fields" S.J. Lilly and L.L. Cowie P3543 Cycle 2 "Deep ultraviolet imaging" S.J. Lilly, L.L. Cowie and E.M. Hu. P2365: During the post-aberration Cycle 1 review, the emphasis was shifted, with the oncurrence of TAC, entirely on to the FOC part of the program, and the WFC part was dropped. This decision was based on the perception that the far-uv capabilities of the telescope were less impaired than the high resolution optical capabilities. The FOC observations were taken in 1992. The data have been reduced. Essentially all instrumental artifacts were removed despite problems with the intermittent background source which led to the rejection of about 20% of the data. Unfortunately, the sensitivity levelis such that no readily identifiable sources were detected. We are presently attempting to correlate the far-uv image with existing optical data. While we have been dissappointed by the poor sensitivity of the aberrated FOC for this program of deep ultraviolet imaging, these pointings did produce a significant fraction of the deepest data used in the HST Medium Deep Survey. P3543: No observations have been taken, or are scheduled, because of the power supply problem with the f/48 mode of the FOC ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Simon Lilly, Francois Hammer, Olivier Le Fevre and David Crampton all have full- time permanent positions in their institutions with office and secretarial support etc. They all have individual access to Sparc-10 class workstations, with IRAF, STSDAS etc installed. The P.I. has an NSERC grant of $45,000 p.a. (with no overhead) part of which will be used to support David Schade as a PDF in Toronto for two years from Fall 1993. The other major investigators also have individual research grants that are entirely adequate to support this research. The French and Canadian TACs have committed large amounts of CFHT observing time to the CFRS survey. In the last two years we have been awarded almost 40 nights. We also have access to the ESO, including the NTT, and, eventually, will have access to the VLT and Gemini. ------------------------------------------------------------------------------------ 11. Address Information Name: SIMON J LILLY Category: PI Institution: 4664 Address: DEPARTMENT OF ASTRONOMY 60 ST GEORGE STREET City: TORONTO State: ON Zip Code: M8X 2E4 Country: CANADA Telephone: (416) 978-5186 Telex (or e-mail): lilly@perceval.astro.utoronto.ca ------------------------------------------------------------------------------------ Name: Category: CON Institution: Address: City: State: Zip Code: Country: Telephone: Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5449 [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 FIELD- E,325 RA = 03H 02M 42.44S +/- 2000.00 Z = 0.60 1 V=21.6 030243+00132 0.1S, 2 SURF(R)=26.2 4 CFRS-03- DEC = +00D 13' 23.7" +/- 480+488 1.0" Comments: FAINT GALAXY SURVEY FIELD ------------------------------------------------------------------------------------------------------------------------------------ 2 FIELD- E,325 RA = 03H 02M 33.55S +/- 2000.00 Z = 0.61 1 V=21.9 030233+00125 0.1S, 2 SURF(R)=26.2 5 CFRS-03- DEC = +00D 12' 55.2" +/- 595+599 1.0" Comments: FAINT GALAXY SURVEY FIELD ------------------------------------------------------------------------------------------------------------------------------------ 3 FIELD- E,325 RA = 14H 15M 58.57S +/- 1950.00 Z = 1 V=21.9 141743+52302 0.1S, 0.659 2 SURF(R)=26.2 5 CFRS-14- DEC = +52D 44' 11.7" +/- 1087+1139 1.0" 15V24-1139 Comments: FAINT GALAXY SURVEY FIELD ------------------------------------------------------------------------------------------------------------------------------------ 4 FIELD- E,325 RA = 14H 16M 25.02S +/- 1950.00 Z = 1 V=21.5 141809+52301 0.1S, 0.600 2 SURF(R)=26.2 5 CFRS-14- DEC = +52D 44' 01.2" +/- 393 1.0" Comments: FAINT GALAXY SURVEY FIELD ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5449 [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 1.1 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2000S 1 2 1 CYCLE 4 030243+0013 180M SEQ 1.1-1.6 NO GAP 24 AT 07-NOV-94 +/- 45D ------------------------------------------------------------------------------------------------------------------------------------ 1.2 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 030243+0013 180M SAME ORIENT FOR 24 1.2-1.6 AS 1.1 ------------------------------------------------------------------------------------------------------------------------------------ 1.3 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2200S 11 2 1 CYCLE 4 030243+0013 180M 24 ------------------------------------------------------------------------------------------------------------------------------------ 1.4 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 030243+0013 180M 24 ------------------------------------------------------------------------------------------------------------------------------------ 1.5 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 030243+0013 180M 24 ------------------------------------------------------------------------------------------------------------------------------------ 1.6 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 030243+0013 180M 24 ------------------------------------------------------------------------------------------------------------------------------------ 2.1 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2000S 1 2 1 CYCLE 4 030233+0012 180M SEQ 2.1-2.6 NO GAP 55 AT 07-NOV-94 +/- 45D ------------------------------------------------------------------------------------------------------------------------------------ 2.2 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 030233+0012 180M SAME ORIENT FOR 55 2.2-2.6 AS 2.1 ------------------------------------------------------------------------------------------------------------------------------------ 2.3 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 030233+0012 180M 55 ------------------------------------------------------------------------------------------------------------------------------------ 2.4 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 030233+0012 180M 55 ------------------------------------------------------------------------------------------------------------------------------------ 2.5 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 030233+0012 180M 55 ------------------------------------------------------------------------------------------------------------------------------------ 2.6 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 030233+0012 180M 55 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5449 [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 3.1 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 141743+5230 180M SEQ 3.1-3.6 NO GAP 25 ------------------------------------------------------------------------------------------------------------------------------------ 3.2 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141743+5230 180M SAME ORIENT FOR 25 3.2-3.6 AS 3.1 ------------------------------------------------------------------------------------------------------------------------------------ 3.3 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141743+5230 180M 25 ------------------------------------------------------------------------------------------------------------------------------------ 3.4 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141743+5230 180M 25 ------------------------------------------------------------------------------------------------------------------------------------ 3.5 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141743+5230 180M 25 ------------------------------------------------------------------------------------------------------------------------------------ 3.6 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141743+5230 180M 25 ------------------------------------------------------------------------------------------------------------------------------------ 4.1 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2200S 1 2 1 CYCLE 4 141809+5230 180M SEQ 4.1-4.6 NO GAP 15 ------------------------------------------------------------------------------------------------------------------------------------ 4.2 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141809+5230 180M SAME ORIENT FOR 15 4.2-4.6 AS 4.1 ------------------------------------------------------------------------------------------------------------------------------------ 4.3 FIELD- WFPC2 IMAGE PC1-FIX F814W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141809+5230 180M 15 ------------------------------------------------------------------------------------------------------------------------------------ 4.4 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141809+5230 180M 15 ------------------------------------------------------------------------------------------------------------------------------------ 4.5 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141809+5230 180M 15 ------------------------------------------------------------------------------------------------------------------------------------ 4.6 FIELD- WFPC2 IMAGE PC1-FIX F450W CR-SPLIT=0.50 1 2600S 1 2 1 CYCLE 4 141809+5230 180M 15 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5449 [ 7] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=0.50 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 17.30 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category GALAXIES & CLUSTERS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category DISTANT GALAXIES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 4; SEQ 1.1-1.6 NO GAP; AT 07-NOV-94 +/- 45D SAME ORIENT FOR 1.2-1.6 AS 1.1 CYCLE 4 SEQ 2.1-2.6 NO GAP; SAME ORIENT FOR 2.2-2.6 AS 2.1 SEQ 3.1-3.6 NO GAP SAME ORIENT FOR 3.2-3.6 AS 3.1 SEQ 4.1-4.6 NO GAP SAME ORIENT FOR 4.2-4.6 AS 4.1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W F450W ------------------------------------------------------------------------------------------------------------------------------------ Target Names FIELD-030243+001324 CFRS-03-480+488 FIELD-030233+001255 CFRS-03-595+599 FIELD-141743+523025 CFRS-14-1087+1139 15V24-1139 FIELD-141809+523015 CFRS-14-393 ------------------------------------------------------------------------------------------------------------------------------------