6631( 19) - 12/21/98 11:06 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6631 Version: 19 Check-in Date: 21-Dec-1998 11:05:43 1.Proposal Title: Imaging a Cluster of Galaxies at Redshift 2.38 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 6 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Paul Francis Mt. Stromlo and Siding Spring Observatories CoI: Bruce Woodgate NASA Goddard Space-Flight Center N ------------------------------------------------------------------------------------ 5. Abstract We have discovered ~ 8 galaxies at redshift 2.38, forming what we believe to be a rich galaxy cluster in the early stages of formation. A sub-set of ~ 4 galaxies within the cluster form a very compact (< 100 kpc) galaxy group and may be merging to form a giant elliptical galaxy. This proto- elliptical is embedded in an extended, Ly-Alpha emitting, lumpy cloud of gas and dust, which is probably responsible for a complex of Lyman-limit absorption systems in the spectrum of a background QSO. We propose to image the cluster both in broad-band colours and in Ly -Alpha. These images will allow us to search for compact starbursts, which we hypothesise are responsible for the presence of dust in the extended gaseous cloud surrounding the proto-elliptical. The detailed morphology of the Ly-Alpha emission will tell us about the distribution of dust and gas, and their interaction with the stellar population. The colours, sizes and morphologies of the galaxies will give us a picture of n ew-born cluster ellipticals. ------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 2] Observations Description ------------------------ We propose to observe though the F410 filter for 24 orbits. This filter is 147 Angstrom wide and its peak transmission wavelength closely matches the wavelength of Ly-Alpha in this cluster (~ 4113 Angstrom). Orbital visibility at this declination is 55 minutes, which allowing for acquisition and overheads gives 44 or 46 minutes exposure on target per orbit. No CR-split will be required, as CR rejection can be done by using frames taken in different orbits. WFPC2's field of view is sufficient to observe all our galaxies simultaneously. Due to its lower read noise, the FOC would be marginally more sensitive through the F410 filter. However, its field of view is too small to observe all our galaxies simultaneously, and we believe the advantage of observing ten galaxies simultaneously to outweigh the slight sensitivity disadvantage. We plan to be sensitive to line fluxes of > 10^-17 ergs cm^-2 s^- 1 from unresolved sources. A source with this flux will yield 3.4 * 10^-3 counts pe r second. Sky counts will be low (1.6 * 10^-3 counts per second per pixel). For an unresolved source, read-out noise and poisson noise will be comparable, and a 5 Sigma detection will require ~ 24 orbits. Our sensitivity will decrease for more extended sources, becoming comparable to the limiting narrow-band magnitudes obtainable with ground-based 4-m telescopes on scales of ~ 0.7". The depth of the off-band comparison image (F450) determines the equivalent width sensitivity limit on our Ly-Alpha search. Limits of below 50 Angstrom are not sensible, as confusion with foreground O II emission dominates, and confirming spectroscopy will probably be impossible at these faint limits. An off-band limiting magnitude of ~ 29 for unresolved sources gives an equivalent- width limit of 50 Angstrom (given the relative transmission and width of F410 and F450), and will require ~ 8 orbits. The broad-band observations are sky limited, so the low-sky constraint is needed; this only reduced e xp osure times by ~ 5%, as most of the high-sky period is take n up by overheads. We choose F450 as our off-band because of its sensitivity. Its centroid lies somewhat to the red of F410's centroid, but our F702 observations should allow us to make the slight necessary colour correction. We also plan to obtain 6 orbits with the wide R filter, F702. This will allow us to measure continuum colours for our galaxies and for any star formation regions identified. With 6 orbits we will reach a limiting magnitude of R ~ 28 for compact objects. The F450 and F702 exposures are chosen to match the sensitivity of the Ly-Alpha search for compact star formation regions. Using the models of Charlot & Fall (1993, in `First Light in the Universe', ed Rocca Volmerange et al. p 341), Bruzual & Charlot (1993, ApJ 405, 538) and Arimoto et al. (1987, A& A 173, 23 and 1992, A& A 253, 21), a compact dust-free starbursting region of stellar mass 10^8 M_SUN will emit roughly our limiting Ly- Alpha flux, and have B ~ 29 and R ~ 28, our limiting F450 and F702 mag ni tudes for compact objects. This would correspond to a star formation rate of ~ 0.3 M_sun yr^-1. This choice of a limiting sensitivity was guided by the experience of Windhorst et al. (1995, private communication), and is about a factor of five deeper than the limiting magnitude of ground-based 4-m class telescopes (this field is too far south for Keck). Given the surface brightnesses measured from the ground for the centre of B1 and for B2, these integration times should give us enough photons per resolution element to generate maps with significant information on scales matching HST's resolution. In Oct 95 at the AAT we obtained Ly-alpha imaging of a larger field surrounding the group, identifying several more probable Ly-alpha galaxies. By judicious choice of orientation and pointing, it is possible to include two of these new galaxy candidates in the WFPC-2 field of view. Real Time Justification ----------------------- Our Ly-Alpha galaxies were first detected in two nights of narrow-band imaging on the CTIO 4-m telescope. We have been awarded three nights on the AAT and one night on the CTIO 4-m in October 1995 for further narrow band imaging, in which we will extend our field to view to cover the whole absorption- line supercluster and push our sensitivity to the theoretical limiting magnitude of 4-m telescopes, using a purpose built narrow-band filter at prime focus. We have broad-band optical colours obtained during two nights on the ESO 3.6-m telescope. We have been scheduled AAT and CTIO 4-m time to push our optical broad-band images to the limiting magnitudes of the telescopes. We have had four nights of spectroscopy on our galaxies, two with the ESO NTT, and one each with the AAT and CTIO 4-m, which has confirmed the Ly-Alpha detections and detected CIV in B1. We have another two nights of spectroscopy on the AAT scheduled in late September 1995. We have a high resolution spectrum of the background QSO obtained in 4 nights on the AAT. We have had five nights of near -IR imaging with the Siding Spring 2.3-m telescope, and two with the ESO 2.2-m telescope. Results include detecting our galaxies in the H and K bands, and a narrow-band H-Alpha detection of B1. We have mapped our field at 1344 and 2378 MHz with the compact array of the Australia Telescope, 20 hours integration in both. We also have a map at 847 MHz from Molonglo. Future plans include mm-wave observations in search of redshifted CO emission, and possibly Sunyaev- Zel'dovich measurements of the cluster gas. The lack of a strong radio sources in the field make it an ideal test-bed for sensitive radio observations. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 3] Data Distribution Paper Products: Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-CLUS- CLUSTER OF GALAXIES, RA=21H 42M 26.80S +/- 2", DEC=- J2000 Z = 2.38 F-LINE(4112)=8+/-1e-16 2142-4420 HIGH REDSHIFT CLUSTER, 44D 20' 42.00" +/- 2" B = 24.5+/-0.5 GROUP, EMISSION LINE NEBULA Comments: The position is roughly in the centre of a group of candidate galaxies, and is chosen to maximise the number lying within the WFPC-2 field of view, assuming a particular orientation angle, and to place the brightest galaxies centrally on WF3. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 0. 0. 0. 6631( 19) - 12/21/98 11:06 - [ 5] Visit: 01 Visit Priority: Visit Requirements: ORIENT 006D TO 031D GROUP 1-10 WITHIN 30D On Hold Comments: Additional Comments: An orient between 17 and 30 is preferred. All 10 visits should ideally use the same guide stars. 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-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.0, 0.0 MAX DUR 42-4420 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.0, 0.0 MAX DUR 42-4420 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.5,-0.25 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.5,-0.25 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 6] Visit: 02 Visit Priority: Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Angle and position chosen to maximise number of galaxy candidates within the field. Check that the primary galaxy does not fall on a bad part of the chip. All 10 visits should use the same guide stars. 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-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.35, 0.4 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.35, 0.4 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG -0.15, 0.65 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG -0.15, 0.65 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 7] Visit: 03 Visit Priority: Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Angle and position chosen to maximise number of galaxy candidates within the field. Check that the primary galaxy does not fall on a bad part of the chip. All 10 visits should use the same guide stars. 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-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.1, 0.1 MAX DUR 42-4420 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.1, 0.1 MAX DUR 42-4420 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.6,-0.15 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.6,-0.15 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 8] Visit: 04 Visit Priority: 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-CLUS-21 WFPC2 IMAGE WF3-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 120 S POS TARG 0.0, 0.0 42-4420 Comments: exposures 1 and 2 should be first in orbit, to avoid saturation ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 120 S POS TARG 0.0, 0.0 42-4420 Comments: exposures 1 and 2 should be 1st in orbit, to avoid saturation ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO,ATD-GAIN=7 1 25 M LOW-SKY POS TARG 0.0, 0.0 42-4420 MAX DUR 200% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG 0.0, 0.0 42-4420 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 5 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG 0.5, 42-4420 -0.25 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG 0.5, 42-4420 -0.25 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 9] Visit: 05 Visit Priority: 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-CLUS-21 WFPC2 IMAGE WF3-FIX F702W ATD-GAIN=15,CR-SPLIT=NO 1 60 S POS TARG 0.0, 0.0 42-4420 Comments: exposures 1 and 2 should be first in visit, to avoid saturation ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F702W ATD-GAIN=15,CR-SPLIT=NO 1 60 S POS TARG 0.0, 0.0 42-4420 Comments: exposures 1 and 2 should be first in visit, to avoid saturation ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F702W CR-SPLIT=NO,ATD-GAIN=7 1 25 M LOW-SKY POS TARG 0.0, 0.0 42-4420 MAX DUR 200% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F702W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG 0.0, 0.0 42-4420 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 5 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F702W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG 0.5, 42-4420 -0.25 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 10] Visit: 06 Visit Priority: Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Angle and position chosen to maximise number of galaxy candidates within the field. Check that the primary galaxy does not fall on a bad part of the chip. All 10 visits should use the same guide stars. 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-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.45, 0.5 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.45, 0.5 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG -0.05, 0.75 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG -0.05, 0.75 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 11] Visit: 07 Visit Priority: Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Angle and position chosen to maximise number of galaxy candidates within the field. Check that the primary galaxy does not fall on a bad part of the chip. All 10 visits should use the same guide stars. 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-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.2, 0.2 MAX DUR 42-4420 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.2, 0.2 MAX DUR 42-4420 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.7,-0.05 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.7,-0.05 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 12] Visit: 08 Visit Priority: Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Angle and position chosen to maximise number of galaxy candidates within the field. Check that the primary galaxy does not fall on a bad part of the chip. All 10 visits should use the same guide stars. 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-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.55, 0.6 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.55, 0.6 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.05, 0.85 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F410M ATD-GAIN=7,CR-SPLIT=NO 1 40 M POS TARG 0.05, 0.85 MAX 42-4420 DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 13] Visit: 09 Visit Priority: 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-CLUS-21 WFPC2 IMAGE WF3-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 120 S POS TARG 0.0, 0.0 42-4420 Comments: exposures 1 and 2 should be first in orbit, to avoid saturation ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W ATD-GAIN=15,CR-SPLIT=NO 1 120 S POS TARG 0.0, 0.0 42-4420 Comments: exposures 1 and 2 should be 1st in orbit, to avoid saturation ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO,ATD-GAIN=7 1 25 M LOW-SKY POS TARG 0.35, 42-4420 0.4 MAX DUR 200% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG 0.35, 42-4420 0.4 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 5 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG -0.15, 42-4420 0.65 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG -0.15, 42-4420 0.65 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 14] Visit: 10 Visit Priority: 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-CLUS-21 WFPC2 IMAGE WF3-FIX F702W ATD-GAIN=15,CR-SPLIT=NO 1 60 S POS TARG 0.0, 0.0 42-4420 Comments: exposures 1 and 2 should be first in visit, to avoid saturation ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F702W ATD-GAIN=15,CR-SPLIT=NO 1 60 S POS TARG 0.0, 0.0 42-4420 Comments: exposures 1 and 2 should be first in visit, to avoid saturation ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F702W CR-SPLIT=NO,ATD-GAIN=7 1 25 M LOW-SKY POS TARG 0.5, 42-4420 -0.25 MAX DUR 200% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F702W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG 0.35, 42-4420 0.4 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 5 GAL-CLUS-21 WFPC2 IMAGE WF3-FIX F702W CR-SPLIT=NO,ATD-GAIN=7 1 35 M LOW-SKY POS TARG 0.35, 42-4420 0.4 MAX DUR 150% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 6631( 19) - 12/21/98 11:06 - [ 15] Summary Form for Proposal 6631 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WF3-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ATD-GAIN=7 CR-SPLIT=NO ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 006D TO 031D GROUP 1-10 WITHIN 30D POS TARG 0.0, 0.0 MAX DUR 150% EXPAND POS TARG 0.5,-0.25 MAX DUR 150% EXPAND SAME ORIENT AS 01 POS TARG 0.35, 0.4 MAX DUR 150% EXPAND POS TARG -0.15, 0.65 MAX DUR 150% EXPAND POS TARG 0.1, 0.1 MAX DUR 150% EXPAND POS TARG 0.6,-0.15 MAX DUR 150% EXPAND POS TARG 0.0, 0.0 LOW-SKY POS TARG 0.0, 0.0 MAX DUR 200% EXPAND LOW-SKY POS TARG 0.0, 0.0 MAX DUR 150% EXPAND LOW-SKY POS TARG 0.5,-0.25 MAX DUR 150% EXPAND POS TARG 0.45, 0.5 MAX DUR 150% EXPAND POS TARG -0.05, 0.75 MAX DUR 150% EXPAND POS TARG 0.2, 0.2 MAX DUR 150% EXPAND POS TARG 0.7,-0.05 MAX DUR 150% EXPAND POS TARG 0.55, 0.6 MAX DUR 150% EXPAND POS TARG 0.05, 0.85 MAX DUR 150% EXPAND LOW-SKY POS TARG 0.35, 0.4 MAX DUR 200% EXPAND LOW-SKY POS TARG 0.35, 0.4 MAX DUR 150% EXPAND LOW-SKY POS TARG -0.15, 0.65 MAX DUR 150% EXPAND LOW-SKY POS TARG 0.5,-0.25 MAX DUR 200% EXPAND ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F410M F450W F702W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GAL-CLUS-2142-4420 ------------------------------------------------------------------------------------------------------------------------------------