9766( 6) - 02/03/04 10:35 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9766 Version: 6 Check-in Date: 03-Feb-2004 10:33:12 1.Proposal Title: The Globular Cluster Systems of Spiral Galaxies along the Hubble Sequence ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 12 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Prof. Duncan A. Forbes Swinburne University of Technology CoI: Prof. Jean P. Brodie UCO/Lick Observatory N CoI: Mr. Jay Strader UCO/Lick Observatory N CoI: Dr. Soeren S. Larsen European Southern Observatory - Germany N CoI: Dr. Michael A. Beasley Swinburne University of Technology N ------------------------------------------------------------------------------------ 5. Abstract While the globular cluster (GC) systems of ellipticals and ongoing mergers have been relatively well-studied with HST, very little is known about the GC systems of spirals besides the Milky Way and M31. To constrain GC/galaxy formation models, especially where spirals are the merger progenitors of ellipticals, it is crucial to understand their GC properties. We propose to obtain ACS images of three edge-on spirals, spanning the Hubble sequence, with Keck spectroscopic follow-up. This will effectively double the number of well-studied spiral systems. We will detect 100-200 GCs per galaxy, sufficient to reveal GC subpopulations, their relative numbers, radial trends, and dependences on Hubble type (e.g., a bulge vs. disk origin for red GCs). For half of our GCs we will be able to measure individual sizes. By providing a much-needed comparative benchmark, these data will allow researchers to better exploit the large existing HST database of GCs in E/S0 galaxies. ------------------------------------------------------------------------------------ 9766( 6) - 02/03/04 10:35 - [ 2] Observations Description ------------------------ Three edge-on spiral galaxies, spanning Sa-Sc, will be imaged in B (F435W) and I (F814W) using ACS/WFC to study their globular cluster (GC) systems. We will obtain two pointings per galaxy, symmetric around the bulge and aligned along the disk. We will measure cluster sizes to at least 0.5 mag beyond the peak of the GCLF (at M_V ~ -7.4) and detect GCs 2-3 mag past the peak. Exposure times were chosen to acheive comparable S/N in both filters. For each pointing, we will use a 2-point line dither pattern to correct for cosmic rays and hot pixels. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 9766( 6) - 02/03/04 10:35 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC3957-POS1 GALAXY, SPIRAL RA=11H54M1.7S +/- 0.1", DEC=- J2000 V = V = 13.1 19D32'40.87" +/- 0.1" 1637.0 Coordinate Source: Other_Source: HST PHASE 2 DSS IMAGE 2 NGC3957-POS2 GALAXY, SPIRAL RA=11H54M3.19S +/- 0.1", DEC=- J2000 V = V = 13.1 19D35'36.08" +/- 0.1" 1637.0 Coordinate Source: Other_Source: HST PHASE 2 DSS IMAGE 3 NGC2683-POS1 GALAXY, SPIRAL RA=08H52M46.94S +/- 0.1", J2000 V = V = 9.8 DEC=+33D26'23.25" +/- 0.1" 411.0 Coordinate Source: Other_Source: HST PHASE 2 DSS IMAGE 4 NGC2863-POS2 GALAXY, SPIRAL RA=08H52M37.08S +/- 0.1", J2000 V = V = 9.8 DEC=+33D24'6.86" +/- 0.1" 411.0 Coordinate Source: Other_Source: HST PHASE 2 DSS IMAGE 5 NGC5170-POS1 GALAXY, SPIRAL RA=13H29M44.95S +/- 0.1", DEC=- J2000 V = V = 11.1 17D57'1.4" +/- 0.1" 1503.0 Coordinate Source: Other_Source: HST PHASE 2 DSS IMAGE 6 NGC5170-POS2 GALAXY, SPIRAL RA=13H29M54.48S +/- 0.1", DEC=- J2000 V = V = 11.1 17D58'39.26" +/- 0.1" 1503.0 Coordinate Source: Other_Source: HST PHASE 2 DSS IMAGE 9766( 6) - 02/03/04 10:35 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.146 Coordinate_Frame POS-TARG Pattern_Orient 47.17 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 9766( 6) - 02/03/04 10:35 - [ 5] Visit: 01 Visit Priority: Visit Requirements: ORIENT 80.0D TO 82.0 D On Hold Comments: Additional Comments: Visit 01. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC3957-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 1230 S PATTERN 1 1-3 1 C ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC3957-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 630 S 1 C ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC3957-POS ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 470 S 1 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 01 1 1 none none none 1 tbd 01 1 2 none none none 2 tbd 01 2 1 none none none 1 tbd 01 2 2 none none none 2 tbd 01 3 1 none none none 1 tbd 01 3 2 none none none 2 tbd 9766( 6) - 02/03/04 10:35 - [ 6] Visit: 02 Visit Priority: Visit Requirements: ORIENT 80.0D TO 82.0 D On Hold Comments: Additional Comments: Visit 02. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC3957-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 1230 S PATTERN 1 1-3 2 C ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC3957-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 630 S 2 C ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC3957-POS ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 470 S 2 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 02 1 1 none none none 1 tbd 02 1 2 none none none 2 tbd 02 2 1 none none none 1 tbd 02 2 2 none none none 2 tbd 02 3 1 none none none 1 tbd 02 3 2 none none none 2 tbd 9766( 6) - 02/03/04 10:35 - [ 7] Visit: 03 Visit Priority: Visit Requirements: ORIENT 32.0D TO 34.0 D On Hold Comments: Additional Comments: Visit 03. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5170-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 1230 S PATTERN 1 1-3 1 C ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5170-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 630 S 1 C ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5170-POS ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 470 S 1 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 03 1 1 none none none 1 tbd 03 1 2 none none none 2 tbd 03 2 1 none none none 1 tbd 03 2 2 none none none 2 tbd 03 3 1 none none none 1 tbd 03 3 2 none none none 2 tbd 9766( 6) - 02/03/04 10:35 - [ 8] Visit: 04 Visit Priority: Visit Requirements: ORIENT 32.0D TO 34.0 D On Hold Comments: Additional Comments: Visit 04. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5170-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 1230 S PATTERN 1 1-3 2 C ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5170-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 630 S 2 C ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5170-POS ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 470 S 2 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 04 1 1 none none none 1 tbd 04 1 2 none none none 2 tbd 04 2 1 none none none 1 tbd 04 2 2 none none none 2 tbd 04 3 1 none none none 1 tbd 04 3 2 none none none 2 tbd 9766( 6) - 02/03/04 10:35 - [ 9] Visit: 05 Visit Priority: Visit Requirements: ORIENT 130.0D TO 132.0 D On Hold Comments: Additional Comments: Visit 05. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC2683-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 565 S PATTERN 1 1-2 1 C ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC2683-POS ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 150 S 1 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 05 1 1 none none none 1 tbd 05 1 2 none none none 1 tbd 05 2 1 none none none 1 tbd 05 2 2 none none none 1 tbd 9766( 6) - 02/03/04 10:35 - [ 10] Visit: 06 Visit Priority: Visit Requirements: ORIENT 130.0D TO 132.0 D On Hold Comments: Additional Comments: Visit 06. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC2863-POS ACS/WF ACCUM WFC F435W CR-SPLIT=NO 1 565 S PATTERN 1 1-2 2 C ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC2863-POS ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 150 S 2 C ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 06 1 1 none none none 1 tbd 06 1 2 none none none 1 tbd 06 2 1 none none none 1 tbd 06 2 2 none none none 1 tbd 9766( 6) - 02/03/04 10:35 - [ 11] Summary Form for Proposal 9766 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 80.0D TO 82.0 D PATTERN 1 1-3 ORIENT 32.0D TO 34.0 D ORIENT 130.0D TO 132.0 D PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F435W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC3957-POS1 NGC3957-POS2 NGC5170-POS1 NGC5170-POS2 NGC2683-POS1 NGC2863-POS2 ------------------------------------------------------------------------------------------------------------------------------------