10518( 2) - 05/13/05 13:33 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10518 Version: 2 Check-in Date: 13-May-2005 17:32:39 1.Proposal Title: Dark matter and the missing images of cx2201-3201 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance GO 14 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Paul Schechter Massachusetts Institute of Technology CoI: Dr. Francisco-Javier Castander Institut d'Estudis Espacials de Catalunya N CoI: Dr. Jose Maza Universidad de Chile N CoI: Mr. Ezequiel Treister Yale University N ------------------------------------------------------------------------------------ 6. Abstract The galaxy lensing the z=3.9 quasar cx2201-3201 is a bulgeless edge-on spiral. Models for the disk that contain more than 20% of the mass predict four images, but only two are seen in ground-based images. We request 3 orbits to obtain high resolution optical and infrared images. If the missing images are indeed absent, more than 80% of the mass inside the Einstein radius must be in an unseen spherical component. ------------------------------------------------------------------------------------ Observations Description ------------------------ 2 orbits ACS direct imaging with F814W and F475W 1 orbit NIC2 direct imageing with F160W Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10518( 2) - 05/13/05 13:33 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 CX2201-3201 GALAXY, GRAVITATIONAL RA=22H01M32.7900S +/- 0.2", J2000 Z = 3.9 V = 21.0 LENS, QSO DEC=-32D01'44.10" +/- 0.2" Coordinate Source: Other_Source: Magellan via USNOB 10518( 2) - 05/13/05 13:33 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10518( 2) - 05/13/05 13:33 - [ 4] Visit: 01 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 CX2201-3201 ACS/WFC ACCUM WFC1-FIX F814W CR-SPLIT=NO 1 557 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 CX2201-3201 ACS/WFC ACCUM WFC1-FIX F475W CR-SPLIT=NO 1 563 S PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CX2201-3201 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 N/A CX2201-3201 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 N/A CX2201-3201 1 ACS/WFC ACCUM WFC1-FIX F814W 3 none none none 1 N/A CX2201-3201 1 ACS/WFC ACCUM WFC1-FIX F814W 4 none none none 1 N/A CX2201-3201 2 ACS/WFC ACCUM WFC1-FIX F475W 1 none none none 2 N/A CX2201-3201 2 ACS/WFC ACCUM WFC1-FIX F475W 2 none none none 2 N/A CX2201-3201 2 ACS/WFC ACCUM WFC1-FIX F475W 3 none none none 2 N/A CX2201-3201 2 ACS/WFC ACCUM WFC1-FIX F475W 4 none none none 2 N/A 10518( 2) - 05/13/05 13:33 - [ 5] Visit: 02 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 CX2201-3201 NIC2 MULTIAC NIC2-FIX F160W NSAMP=19,SAMP-SEQ=STEP64 1 DEF POS TARG 3.1, 3.1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 2 CX2201-3201 NIC2 MULTIAC NIC2-FIX F160W NSAMP=19,SAMP-SEQ=STEP64 1 DEF POS TARG -2.9, 2.9 CUM ------------------------------------------------------------------------------------------------------------------------------------ 3 CX2201-3201 NIC2 MULTIAC NIC2-FIX F160W NSAMP=18,SAMP-SEQ=STEP64 1 DEF POS TARG -3.1,-3.1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 4 CX2201-3201 NIC2 MULTIAC NIC2-FIX F160W NSAMP=18,SAMP-SEQ=STEP64 1 DEF POS TARG 2.9,-2.9 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CX2201-3201 1 NIC2 MULTIAC NIC2-FIX F160W none none none none 1 N/A CUM CX2201-3201 2 NIC2 MULTIAC NIC2-FIX F160W none none none none 1 N/A CUM CX2201-3201 3 NIC2 MULTIAC NIC2-FIX F160W none none none none 1 N/A CUM CX2201-3201 4 NIC2 MULTIAC NIC2-FIX F160W none none none none 1 N/A CUM 10518( 2) - 05/13/05 13:33 - [ 6] Summary Form for Proposal 10518 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1-FIX NIC2-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC NIC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO NSAMP=19 SAMP-SEQ=STEP64 NSAMP=18 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1 PATTERN 1 2 POS TARG 3.1, 3.1 POS TARG -2.9, 2.9 POS TARG -3.1,-3.1 POS TARG 2.9,-2.9 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W F475W F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names CX2201-3201 ------------------------------------------------------------------------------------------------------------------------------------