10509( 2) - 05/13/05 14:42 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10509 Version: 2 Check-in Date: 13-May-2005 18:41:20 1.Proposal Title: The Cluster Lens SDSS 1004+4112: Constraining World Models With its Multiply-Imaged Quasar and Galaxies ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance GO 14 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Prof. Christopher S. Kochanek The Ohio State University Research Foundation CoI: Dr. Masamune Oguri Princeton University N CoI: Mr. Eran O. Ofek Tel Aviv University - Wise Observatory N CoI: Ms. Keren Sharon Tel Aviv University - Wise Observatory Y CoI: Prof. Dan Maoz Tel Aviv University - Wise Observatory N CoI: Dr. Thomas J. Broadhurst Tel Aviv University - Wise Observatory N CoI: Dr. Naohisa Inada University of Tokyo, Institute of N Astronomy CoI: Prof. Yasushi Suto University of Tokyo, Institute of N Astronomy ------------------------------------------------------------------------------------ 6. Abstract We will use deep ACS imaging of the giant (15 arcsec) four-image z_s=1.734 lensed quasar SDSS 1004+4112, and its z_l=0.68 lensing galaxy cluster, to identify many additional multiply-imaged background galaxies. Combining the existing single orbit ACS I-band image with ground based data, we have definitely identified two multiply imaged galaxies with estimated redshifts of 2.6 and 4.3, about 15 probable images of background galaxies, and a point source in the core of the central cD galaxy, which is likely to be the faint, fifth image of the quasar. The new data will provide accurate photometric redshifts, confirm that the candidate fifth image has the same spectral energy distribution as the other quasar images, allow secure identification of additional multiply-lensed galaxies for improving the mass model, and permit identification of faint cluster members. Due to the high lens redshift and the broad redshift distribution of the lensed background sources, we should be able to use the source-redshift scaling of the Einstein radius that depends on (d_ls/d_os), to derive a direct, geometric estimate of Omega_Lambda. The deeper images will also allow a weak lensing analysis to extend the mass distribution to larger radii. Unlike any other cluster lenses, the time delay between the lensed quasar images (already measured for the A--B images, and measurable for the others over the next few years), breaks the so-called kappa-degeneracies that complicate weak-lensing analyses. ------------------------------------------------------------------------------------ 10509( 2) - 05/13/05 14:42 - [ 2] Observations Description ------------------------ Our objective is to approximately double the depth of the existing ACS/WFC imaging data for SDSS1004+4112, and to obtain a new B-band image to a comparable S/N. To this end, we will supplement the 1 existing orbit of F814W data and the 1 scheduled orbit of F555W data with 2 more orbits of F814W, 3 more orbits of F555W data, and 5 orbits of F435W data. Using both our existing data and the new ACS data, we estimate that this will let us detect ~27.5 mag galaxies with S/N=10, with the precise limits depending on galaxy colors. We will use standard CR splits and dithering patterns. This depth is then well matched to that of clusters imaged by us and successfully used for this purpose. The slight, subpixel, degradation in image quality expected in two- gyro model will be of no consequence for these WF data. Since we have no special scheduling constraints, the more limited scheduling opportunities in two-gyro mode will also not affect this program. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10509( 2) - 05/13/05 14:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1004+411 CLUSTER OF GALAXIES, RA=10H04M34.1900S +/- 0.1", J2000 V = 18.5+/-0.5 2 GRAVITATIONAL LENS, DEC=+41D12'44.00" +/- 0.1" HIGH REDSHIFT CLUSTER Coordinate Source: HST_IMAGE Comments: Magnitude is that of brightest quasar image. Lens galaxy is r=20.5 (g~22.5) and the lensed arcs are i~24. Coordinates derived from HST image agree with SDSS coordinates to better than one arcsec 10509( 2) - 05/13/05 14:42 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 3.011 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 3.011 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10509( 2) - 05/13/05 14:42 - [ 5] Visit: 05 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1004+41 ACS/WFC ACCUM WFC1 F555W 1 2200 S PATTERN 1 1 12 see below ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1004+41 ACS/WFC ACCUM WFC1 F814W 1 2200 S PATTERN 2 2 12 see below ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F555W 1 none none 1 1 1303.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F555W 1 none none 2 1 1303.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F555W 2 none none 1 2 1344.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F555W 2 none none 2 2 1344.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F555W 3 none none 1 3 1342.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F555W 3 none none 2 3 1342.0 S SDSS1004+4112 2 ACS/WFC ACCUM WFC1 F814W 1 none none 1 4 1324.0 S SDSS1004+4112 2 ACS/WFC ACCUM WFC1 F814W 1 none none 2 4 1324.0 S SDSS1004+4112 2 ACS/WFC ACCUM WFC1 F814W 2 none none 1 5 1356.0 S SDSS1004+4112 2 ACS/WFC ACCUM WFC1 F814W 2 none none 2 5 1356.0 S 10509( 2) - 05/13/05 14:42 - [ 6] Visit: 06 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1004+41 ACS/WFC ACCUM WFC1 F435W 1 2200 S PATTERN 1 1 12 see below ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1004+41 ACS/WFC ACCUM WFC1 F435W 1 2200 S PATTERN 2 2 12 see below ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F435W 1 none none 1 1 1303.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F435W 1 none none 2 1 1303.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F435W 2 none none 1 2 1344.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F435W 2 none none 2 2 1344.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F435W 3 none none 1 3 1342.0 S SDSS1004+4112 1 ACS/WFC ACCUM WFC1 F435W 3 none none 2 3 1342.0 S SDSS1004+4112 2 ACS/WFC ACCUM WFC1 F435W 1 none none 1 4 1344.0 S SDSS1004+4112 2 ACS/WFC ACCUM WFC1 F435W 1 none none 2 4 1344.0 S SDSS1004+4112 2 ACS/WFC ACCUM WFC1 F435W 2 none none 1 5 1356.0 S SDSS1004+4112 2 ACS/WFC ACCUM WFC1 F435W 2 none none 2 5 1356.0 S 10509( 2) - 05/13/05 14:42 - [ 7] Summary Form for Proposal 10509 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1 PATTERN 2 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F814W F435W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SDSS1004+4112 ------------------------------------------------------------------------------------------------------------------------------------