10126( 2) - 05/13/04 08:26 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10126 Version: 2 Check-in Date: 13-May-2004 12:24:25 1.Proposal Title: The 3-D Shape of the SMC: Is It Tidally Distorted? ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance GO 13 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Edward W. Olszewski University of Arizona CoI: Dr. Paul W. Hodge University of Washington N CoI: Dr. Andrew Dolphin University of Arizona N CoI: Dr. Jason Harris University of Arizona N CoI: Dr. Knut A.G. Olsen National Optical Astronomy Observatories - N CTIO ------------------------------------------------------------------------------------ 6. Abstract We propose to exploit the exceptional spatial resolution of HST to definitively show whether the SMC is tidally elongated along the line-of-sight, and therefore the status of the Milky Way's interaction/destruction of the Magellanic Clouds. We use BVI ACS images of several crowded SMC fields in the region predicted by models of the orbit and tidal evolution of the Magellanic Clouds (and by observations of Cepheids) to have a large depth. We exploit the red clump feature (and the rarer true horizontal branch) to derive the depth. Specifically, we will observe six fields along the predicted region of maximum distance gradient of the SMC, along with two ACS fields and several WFPC2 fields in the archives, to map out the depth of the SMC in this region. We are searching for substructure, such as a tidal tail, that may be present. Crowding in this region of the SMC is so severe that this project cannot be done from the ground. ------------------------------------------------------------------------------------ 10126( 2) - 05/13/04 08:26 - [ 2] Observations Description ------------------------ We are imaging six fields in the Small Magellanic Cloud with ACS using the BVI filters. Lengthy exposures will be made in BVI as well as short exposures in VI. We will not CR-split. These fields are chosen to be in areas of the SMC where models claim we should see large line-of-sight depths due to the interaction of the SMC with the LMC and the Milky Way. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10126( 2) - 05/13/04 08:26 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-265 EXT-CLUSTER, RA=00H47M11.1S +/- 0.1", DEC=- J2000 V = 10.0+/-1.0 UNDESIGNATED 73D28'40.1" +/- 0.1" Coordinate Source: Other_Source: coordinates are not critical at the many many arcsec level; 2 SMCJ004802- GALAXY, UNDESIGNATED RA=00H48M2.7S +/- 0.1", DEC=- J2000 V = 10.0+/-0.1 732058 73D20'58.9" +/- 0.1" Coordinate Source: Other_Source: coordinates are not critical at the 1 arcmin level 3 SMCJ004938- GALAXY, UNDESIGNATED RA=00H49M38.4S +/- 0.1", DEC=- J2000 V = 10.0+/-0.1 731520 73D15'20.3" +/- 0.1" Coordinate Source: Other_Source: coords are not critical at the 1 arcmin level 4 NGC-290 EXT-CLUSTER, HALO, RA=00H51M15.2S +/- 0.1", DEC=- J2000 V = 10.0+/-0.1 UNDESIGNATED 73D09'43.9" +/- 0.1" Coordinate Source: Other_Source: coords are not critical at the many arcsec level 5 K-29 EXT-CLUSTER, HALO, RA=00H51M53.2S +/- 0.1", DEC=- J2000 V = 10.0+/-0.1 UNDESIGNATED 72D57'14.5" +/- 0.1" Coordinate Source: Other_Source: coords are not critical at the many arcsec level 6 SMCJ005257- GALAXY, UNDESIGNATED RA=00H52M57.9S +/- 0.1", DEC=- J2000 V = 10.0+/-0.1 725714 73D03'43.5" +/- 0.1" Coordinate Source: Other_Source: coords are not critical at the 1 arcmin level 10126( 2) - 05/13/04 08:26 - [ 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 NGC-265 ACS/WFC ACCUM WFC1 F435W CR-SPLIT=NO,GAIN=2 1 440 S ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-265 ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 440 S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-265 ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 120 S ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-265 ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 440 S ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-265 ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 120 S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 01 1 none none none none 1 tbd 01 2 none none none none 1 tbd 01 3 none none none none 1 tbd 01 4 none none none none 1 tbd 01 5 none none none none 1 tbd 10126( 2) - 05/13/04 08:26 - [ 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 SMCJ004802- ACS/WFC ACCUM WFC1 F435W CR-SPLIT=NO,GAIN=2 1 440 S 732058 ------------------------------------------------------------------------------------------------------------------------------------ 2 SMCJ004802- ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 440 S 732058 ------------------------------------------------------------------------------------------------------------------------------------ 3 SMCJ004802- ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 120 S 732058 ------------------------------------------------------------------------------------------------------------------------------------ 4 SMCJ004802- ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 440 S 732058 ------------------------------------------------------------------------------------------------------------------------------------ 5 SMCJ004802- ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 120 S 732058 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 02 1 none none none none 1 tbd 02 2 none none none none 1 tbd 02 3 none none none none 1 tbd 02 4 none none none none 1 tbd 02 5 none none none none 1 tbd 10126( 2) - 05/13/04 08:26 - [ 6] Visit: 03 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 SMCJ004938- ACS/WFC ACCUM WFC1 F435W CR-SPLIT=NO,GAIN=2 1 440 S 731520 ------------------------------------------------------------------------------------------------------------------------------------ 2 SMCJ004938- ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 440 S 731520 ------------------------------------------------------------------------------------------------------------------------------------ 3 SMCJ004938- ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 120 S 731520 ------------------------------------------------------------------------------------------------------------------------------------ 4 SMCJ004938- ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 440 S 731520 ------------------------------------------------------------------------------------------------------------------------------------ 5 SMCJ004938- ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 120 S 731520 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 03 1 none none none none 1 tbd 03 2 none none none none 1 tbd 03 3 none none none none 1 tbd 03 4 none none none none 1 tbd 03 5 none none none none 1 tbd 10126( 2) - 05/13/04 08:26 - [ 7] Visit: 04 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 NGC-290 ACS/WFC ACCUM WFC1 F435W CR-SPLIT=NO,GAIN=2 1 440 S ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-290 ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 440 S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-290 ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 120 S ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-290 ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 440 S ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-290 ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 120 S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 04 1 none none none none 1 tbd 04 2 none none none none 1 tbd 04 3 none none none none 1 tbd 04 4 none none none none 1 tbd 04 5 none none none none 1 tbd 10126( 2) - 05/13/04 08:26 - [ 8] 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 K-29 ACS/WFC ACCUM WFC1 F435W CR-SPLIT=NO,GAIN=2 1 440 S ------------------------------------------------------------------------------------------------------------------------------------ 2 K-29 ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 440 S ------------------------------------------------------------------------------------------------------------------------------------ 3 K-29 ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 120 S ------------------------------------------------------------------------------------------------------------------------------------ 4 K-29 ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 440 S ------------------------------------------------------------------------------------------------------------------------------------ 5 K-29 ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 120 S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 05 1 none none none none 1 tbd 05 2 none none none none 1 tbd 05 3 none none none none 1 tbd 05 4 none none none none 1 tbd 05 5 none none none none 1 tbd 10126( 2) - 05/13/04 08:26 - [ 9] 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 SMCJ005257- ACS/WFC ACCUM WFC1 F435W CR-SPLIT=NO,GAIN=2 1 440 S 725714 ------------------------------------------------------------------------------------------------------------------------------------ 2 SMCJ005257- ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 440 S 725714 ------------------------------------------------------------------------------------------------------------------------------------ 3 SMCJ005257- ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 120 S 725714 ------------------------------------------------------------------------------------------------------------------------------------ 4 SMCJ005257- ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 440 S 725714 ------------------------------------------------------------------------------------------------------------------------------------ 5 SMCJ005257- ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 120 S 725714 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 06 1 none none none none 1 tbd 06 2 none none none none 1 tbd 06 3 none none none none 1 tbd 06 4 none none none none 1 tbd 06 5 none none none none 1 tbd 10126( 2) - 05/13/04 08:26 - [ 10] Summary Form for Proposal 10126 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO GAIN=2 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F435W F555W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-265 SMCJ004802-732058 SMCJ004938-731520 NGC-290 K-29 SMCJ005257-725714 ------------------------------------------------------------------------------------------------------------------------------------