5973( 0) - 07/18/95 19:00 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5973 Version: ********** Check-in Date: ********** 1.Proposal Title: The Host Galaxies of Radio-Quiet High- Redshift Quasi-Stellar Objects ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Quasars GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Matthew Lehnert Institute of Geophysics and Planetary Physics CoI: Timothy Heckman Dept of Physics and Astronomy, Johns N Hopkins University, Baltimore, MD 21218 CoI: James Lowenthal Lick Observatory, UC Santa Cruz, Santa N Cruz, CA 95064 ------------------------------------------------------------------------------------ 6. Abstract Studying the environments of quasi-stellar objects (QSOs) at high redshift may help to answer the question: Why were powerful QSOs three orders of magnitude more common at z=2 to 3 than at present? Recent data have shown that high-z radio- loud quasars are immersed in spatially-resolved ``fuzz'' with properties suggestive of young, massive galaxies. Quasars as radio-loud as those studied to date represent <<1\ population of high-redshift radio galaxies are equally rare). To understand the applicability of these results to the much more numerous radio-quiet QSOs, and hence their implications for understanding the causes and effects of the ``quasar epoch'' at high-redshift, we propose to conduct a narrow-band (at LyAlpha) and broad-band (F555W) optical imaging investigation using WFPC2 on HST of a small sample of radio- quiet QSOs at similarly high redshifts as the radio-loud quasars studied previously. These data will allow us for the first time to compare at similar absolute spatial resolution the morphologies and luminosities of high-redshift radio-quiet QSOs to those of low-redshift QSOs studied from the ground, thus determining how the host galaxies of QSOs have evolved with time, and also to compare the hosts of high- redshift radio-quiet and radio-loud quasars. ------------------------------------------------------------------------------------ 5973( 0) - 07/18/95 19:00 - [ 2] Observations Description ------------------------ For this project, we selected 5 radio-quiet QSOs from the catalog of Hewitt and Burbidge (1994) with redshifts and optical magnitudes similar to those of the radio-loud quasars that will be observed as part of our Cycle 4 program (we also required the QSOs to have accurate coordinates listed in Hewitt and Burbidge). The radio-loud quasars that we will observe with HST in cycle 4 are the 5 quasars from Heckman Etal 1992a that had the brightest continuum and LyAlpha emitting fuzz of the entire sample of 18 and also happened (by happy coincidence to place redshifted LyAlpha into the band-passes of the OII Quad filters available with the WFPC2. Thus we have also selected radio-quiet QSOs with redshifts such that their LyAlpha emission falls into the bandpass of one of the four OII Quad filters. Continuum Imaging Our choice of continuum filter is dictated by three criteria. First, the bright LyAlpha line should be excluded from the bandpass. Second, the filter should be among the most efficient broad-band filters available on the WFPC2. Third, the central wavelength should be as near as possible to the redshifted wavelength of LyAlpha (3832, 3905, 3935, 4008, and 3838Angstrom \ for the 5 QSOs), to be suitable for continuum subtraction and still meet criteria one and two for all the QSOs in our sample. A reasonable compromise among these criteria is F555W. Since F555W can be used in either the WFC or the PC, we choose to image the QSOs in the PC to obtain the highest possible spatial resolution. LyAlpha Imaging The redshifted wavelengths of LyAlpha are 3832, 3905, 3935, 4008, and 3838Angstrom \ for QSOs 0050--280, 1045+060, 1207-- 107, 1313--156, and 2206-- 187, respectively. The three filters that are suitable for LyAlpha imaging are: FQUVN-B, which has a central wavelength of 3831Angstrom, suitable for observing both 0050--280 and 2206--187; FQUVN-C, which has a central wavelength of 3915Angstrom, suitable for observing both 1045+060 and 1207--107; and FQUVN- D, which has a central wavelength of 3992Angstrom, suitable for observing 1313- -156. The redshifted OII quad filters (FQUVN) can be used only in the WFC. Note that the equivalent width of the LyAlpha line is likely to be large and thus the narrow-band images will be dominated by LyAlpha emission. The observing strategy described above is almost exactly the same as for our radio- loud quasar HST Cycle 4 program. Exposure times will be 2 * 42 minutes (using CR- split for both of the exposures, 21 minutes per exposure) through the narrow- band filters (this fills exactly two orbits per QSO) and 3 * 11 minutes (no CR- split; using the first orbit for a QSO to do the continuum imaging; fills exactly one orbit per QSO) through the continuum filter F555W. These exposure times will allow us to detect structures down to 8times10^-17 ergs cm^-2 s^-1 HST PSF^-1 at LyAlpha and to ~28 V mag HST PSF^-1 at F555W, sufficiently sensitive to detect extended near-nuclear emission and any clumpy structure on sub-galaxy scales if it is similar to the light of present-day L(star) galaxies. Real Time Justification ----------------------- We have no special requirements. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 5973( 0) - 07/18/95 19:00 - [ 3] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5973( 0) - 07/18/95 19:00 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 0050-280 Galaxy, QSO RA=00H 52M 31.8S +/- 0.5S, DEC=- J2000.0 Z=2.152 V=20.25 27D 48' 07.3" +/- 0.9" U-B=-0.69 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000.0 0.0000 0.0000 0.0000 2 1045+060 Galaxy, QSO RA=10H 47M 42.76S +/- 0.3S, J2000.0 Z=2.212 V=19.48 DEC=05D 49' 59.2" +/- 0.5" Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000.0 0.0000 0.0000 0.0000 3 1207-107 Galaxy, QSO RA=12H 09M 51.92S +/- 0.3S, DEC= J2000.0 Z=2.237 V=19.03 -10D 59' 58.1" +/- 0.5" Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000.0 0.0000 0.0000 0.0000 4 1313-156 Galaxy, QSO RA=13H 15M 44.41S +/- 0.3S, DEC= J2000.0 Z=2.297 V=20.59 -15D 56' 46.6" +/- 0.5" Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000.0 0.0000 0.0000 0.0000 5 2206-187 Galaxy, QSO RA=22H 09M 28.40S +/- 0.3S, DEC= J2000.0 Z=2.157 V=19.60 -18D 32' 57.9" +/- 0.5" Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000.0 0.0000 0.0000 0.0000 5973( 0) - 07/18/95 19:00 - [ 5] Visit: 01 Visit Requirements: 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 0050-280 WFPC2 IMAGE PC1 F555W 5407 CR-SPLIT=NO 3 700S ------------------------------------------------------------------------------------------------------------------------------------ 2 0050-280 WFPC2 IMAGE WF4 FQUVN 3839 1 2500S ------------------------------------------------------------------------------------------------------------------------------------ 3 0050-280 WFPC2 IMAGE WF4 FQUVN 3839 1 2500S POS TARG 0.5, 0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5973( 0) - 07/18/95 19:00 - [ 6] Visit: 02 Visit Requirements: 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 1045+060 WFPC2 IMAGE PC1 F555W 5407 CR-SPLIT=NO 1 600S ------------------------------------------------------------------------------------------------------------------------------------ 2 1045+060 WFPC2 IMAGE PC1 F555W 5407 CR-SPLIT=NO 2 700S ------------------------------------------------------------------------------------------------------------------------------------ 3 1045+060 WFPC2 IMAGE WF3 FQUVN 3916 1 2400S ------------------------------------------------------------------------------------------------------------------------------------ 4 1045+060 WFPC2 IMAGE WF3 FQUVN 3916 1 2400S POS TARG 0.5, 0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5973( 0) - 07/18/95 19:00 - [ 7] Visit: 03 Visit Requirements: 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 1207-107 WFPC2 IMAGE PC1 F555W 5407 CR-SPLIT = NO 1 600S ------------------------------------------------------------------------------------------------------------------------------------ 2 1207-107 WFPC2 IMAGE PC1 F555W 5407 CR-SPLIT = NO 2 700S ------------------------------------------------------------------------------------------------------------------------------------ 3 1207-107 WFPC2 IMAGE WF3 FQUVN 3916 1 2400S ------------------------------------------------------------------------------------------------------------------------------------ 4 1207-107 WFPC2 IMAGE WF3 FQUVN 3916 1 2400S POS TARG 0.5, 0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5973( 0) - 07/18/95 19:00 - [ 8] Visit: 04 Visit Requirements: 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 1313-156 WFPC2 IMAGE PC1 F555W 5407 CR-SPLIT = NO 1 600S ------------------------------------------------------------------------------------------------------------------------------------ 2 1313-156 WFPC2 IMAGE PC1 F555W 5407 CR-SPLIT = NO 2 700S ------------------------------------------------------------------------------------------------------------------------------------ 3 1313-156 WFPC2 IMAGE WF2 FQUVN 3986 1 2400S ------------------------------------------------------------------------------------------------------------------------------------ 4 1313-156 WFPC2 IMAGE WF2 FQUVN 3986 1 2400S POS TARG 0.5, 0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5973( 0) - 07/18/95 19:00 - [ 9] Visit: 05 Visit Requirements: 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 2206-187 WFPC2 IMAGE PC1 F555W 5407 CR-SPLIT = NO 1 600S ------------------------------------------------------------------------------------------------------------------------------------ 2 2206-187 WFPC2 IMAGE PC1 F555W 5407 CR-SPLIT = NO 2 700S ------------------------------------------------------------------------------------------------------------------------------------ 3 2206-187 WFPC2 IMAGE WF4 FQUVN 3839 1 2400S ------------------------------------------------------------------------------------------------------------------------------------ 4 2206-187 WFPC2 IMAGE WF4 FQUVN 3839 1 2400S POS TARG 0.5, 0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5973( 0) - 07/18/95 19:00 - [ 10] Summary Form for Proposal 5973 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO CR-SPLIT = NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Quasars ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements POS TARG 0.5, 0.5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W FQUVN ------------------------------------------------------------------------------------------------------------------------------------ Target Names 0050-280 1045+060 1207-107 1313-156 2206-187 ------------------------------------------------------------------------------------------------------------------------------------