10128( 2) - 05/17/04 09:12 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10128 Version: 2 Check-in Date: 17-May-2004 13:09:12 1.Proposal Title: Probing the Formation & Evolution of M31's Outer Disk and Halo, Part II ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance GO 13 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Annette Ferguson Max-Planck-Institut fur Astrophysik CoI: Dr. Rachel Johnson European Southern Observatory - Chile N CoI: Mr. Daniel Faria European Southern Observatory - Chile N CoI: Dr. Rodrigo Ibata Universite de Strasbourg I N CoI: Dr. Michael Irwin University of Cambridge N CoI: Dr. Geraint F. Lewis University of Sydney N CoI: Dr. Nial R. Tanvir University of Hertfordshire N CoI: Dr. Kathryn Johnston Wesleyan University N CoI: Dr. Scott C. Chapman California Institute of Technology N CoI: Mr. Alan McConnachie University of Cambridge N ------------------------------------------------------------------------------------ 6. Abstract Over the past several years, our group has conducted a large panoramic ground-based imaging survey of resolved luminous stars in M31 using the INT Wide-Field Camera. Our now complete survey covers 40 square degrees around M31, extending to a major axis distance of ~60 kpc. This survey has led to the discovery of numerous spatial density and/or colour (metallicity?) variations within the M31 halo and outer disk, and interim results motivated a successful Cycle 11 HST/ACS program to obtain deep colour-magnitude diagrams for six regions exhibiting the most prominent stellar substructure known at that time, including the giant stellar stream and the clump of stars near the anomolous cluster, G1. The present proposal requests time to augment our Cycle 11 program with observations of two new features, a very low surface brightness fragment lying 3 degrees north-east of center and a high surface brightness spur of emission in the south-western half of the galaxy, which we have discovered since 2001. Deep colour-magnitude diagrams reaching 2-3 magnitudes below the horizontal branch will be constructed, allowing detailed characterization of the luminous evolved stellar populations via the red giant metallicity distribution, the luminous asymptotic giant branch, the horizontal branch morphology and the red clump, as well as the detection of a main-sequence that may be present from any younger component. Together the Cycle 11 and 13 pointings target all prominent stellar substructure known to exist within 60 kpc of M31. ------------------------------------------------------------------------------------ 10128( 2) - 05/17/04 09:12 - [ 2] Observations Description ------------------------ We will obtain deep CMDs at two locations in the halo of M31 where we have discovered significant new stellar substructure since September 2001. We will image in the broad-V (F606W) and I (F814W) filters. Based on experience from our Cycle 11 program (and indeed consistent with expectations from the ACS ETC), we will reach V~27 with a S/N~10 in 1 orbit with F606W and 2 orbits with F814W, providing excellent sensitivity to both blue and red luminous evolved stars (eg. RGB, RC and HB). We will obtain two separate pointings for the distant M31-NE field in order to improve the statistics of sparsely-populated regions of the CMD. Each visit consists of 3 orbits: two comprising four F814W exposures and one comprising three F606W exposures. Exposures are dithered by a few pixels (either with POS-TARG or specified pattern) in order to aid removal of CRs and hot pixels. Parallel exposures are obtained with WFPC2 in F606W and F814W. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10128( 2) - 05/17/04 09:12 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M31- GALAXY, SPIRAL, HALO RA=00H51M56.7S +/- 0.1", J2000 V = 19.0+/-0.5 005157+44063 DEC=+44D06'38.5" +/- 0.1", V-I=1.0+/-0.5 8 PLATE-ID=01JV Coordinate Source: GSC_SURVEY_PLATE Comments: flux data refers to the brightest stars expected in this field 2 M31- GALAXY, HALO, SPIRAL RA=00H50M55.2S +/- 0.1", J2000 V = 19.0+/-0.5 005055+44100 DEC=+44D10'0.4" +/- 0.1", PLATE- V-I=1.0+/-0.5 0 ID=01JV Coordinate Source: GSC_SURVEY_PLATE Comments: flux data refers to the brightest stars expected in this field 3 M31- GALAXY, HALO, SPIRAL RA=00H35M0.3S +/- 0.1", J2000 V = 19.0+/-0.5 003500+40173 DEC=+40D17'37.3" +/- 0.1", V-I=1.0+/-0.5 7 PLATE-ID=0738 Coordinate Source: GSC_SURVEY_PLATE Comments: flux data refers to the brightest stars expected in this field 10128( 2) - 05/17/04 09:12 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.1459 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 47.17 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10128( 2) - 05/17/04 09:12 - [ 5] 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 M31-005157+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1230 S POS TARG 0, 0; PAR 2 WITH 440638 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 3 M31-005157+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1300 S POS TARG 0.0992, 0.107; 440638 PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 5 M31-005157+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1350 S POS TARG 0.1984, 0.214; 440638 PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 7 M31-005157+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1330 S POS TARG 0.2976, 0.321; 440638 PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 9 M31-005157+ ACS/WFC ACCUM WFC F606W CR-SPLIT=NO,GAIN=2 1 823 S PATTERN 1 9-10; PAR 10 440638 WITH 9 ------------------------------------------------------------------------------------------------------------------------------------ 10 ANY WFPC2 IMAGE WFALL F606W CR-SPLIT=NO 1 600 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 1200.0 01 5 none none none none 2 tbd 01 6 none none none none 2 1100.0 01 7 none none none none 2 tbd 01 8 none none none none 2 1100.0 01 9 1 none none none 3 tbd 01 9 2 none none none 3 tbd 10128( 2) - 05/17/04 09:12 - [ 6] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 01 9 3 none none none 3 tbd 01 10 1 none none none 3 700.0 01 10 2 none none none 3 600.0 01 10 3 none none none 3 600.0 10128( 2) - 05/17/04 09:12 - [ 7] 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 M31-005055+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1230 S POS TARG 0, 0; PAR 2 WITH 441000 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 3 M31-005055+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1300 S POS TARG 0.0992, 0.107; 441000 PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 5 M31-005055+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1350 S POS TARG 0.1984, 0.214; 441000 PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 7 M31-005055+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1330 S POS TARG 0.2976, 0.321; 441000 PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 9 M31-005055+ ACS/WFC ACCUM WFC F606W CR-SPLIT=NO,GAIN=2 1 823 S PATTERN 1 9-10; PAR 10 441000 WITH 9 ------------------------------------------------------------------------------------------------------------------------------------ 10 ANY WFPC2 IMAGE WFALL F606W CR-SPLIT=NO 1 600 S ------------------------------------------------------------------------------------------------------------------------------------ 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 1200.0 02 5 none none none none 2 tbd 02 6 none none none none 2 1100.0 02 7 none none none none 2 tbd 02 8 none none none none 2 1100.0 02 9 1 none none none 3 tbd 02 9 2 none none none 3 tbd 10128( 2) - 05/17/04 09:12 - [ 8] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 02 9 3 none none none 3 tbd 02 10 1 none none none 3 700.0 02 10 2 none none none 3 600.0 02 10 3 none none none 3 600.0 10128( 2) - 05/17/04 09:12 - [ 9] 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 M31-003500+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1230 S POS TARG 0, 0; PAR 2 WITH 401737 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 3 M31-003500+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1300 S POS TARG 0.0992, 0.107; 401737 PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 5 M31-003500+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1350 S POS TARG 0.1984, 0.214; 401737 PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 7 M31-003500+ ACS/WFC ACCUM WFC F814W CR-SPLIT=NO,GAIN=2 1 1330 S POS TARG 0.2976, 0.321; 401737 PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFPC2 IMAGE WFALL F814W CR-SPLIT=NO 1 1100 S ------------------------------------------------------------------------------------------------------------------------------------ 9 M31-003500+ ACS/WFC ACCUM WFC F606W CR-SPLIT=NO,GAIN=2 1 823 S PATTERN 1 9-10; PAR 10 401737 WITH 9 ------------------------------------------------------------------------------------------------------------------------------------ 10 ANY WFPC2 IMAGE WFALL F606W CR-SPLIT=NO 1 600 S ------------------------------------------------------------------------------------------------------------------------------------ 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 2 tbd 03 6 none none none none 2 tbd 03 7 none none none none 2 tbd 03 8 none none none none 2 tbd 03 9 1 none none none 3 tbd 03 9 2 none none none 3 tbd 10128( 2) - 05/17/04 09:12 - [ 10] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 03 9 3 none none none 3 tbd 03 10 1 none none none 3 tbd 03 10 2 none none none 3 tbd 03 10 3 none none none 3 tbd 10128( 2) - 05/17/04 09:12 - [ 11] Summary Form for Proposal 10128 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC WFALL ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO GAIN=2 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements POS TARG 0, 0; PAR 2 WITH 1 POS TARG 0.0992, 0.107; PAR 4 WITH 3 POS TARG 0.1984, 0.214; PAR 6 WITH 5 POS TARG 0.2976, 0.321; PAR 8 WITH 7 PATTERN 1 9-10; PAR 10 WITH 9 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names M31-005157+440638 ANY M31-005055+441000 M31-003500+401737 ------------------------------------------------------------------------------------------------------------------------------------