10438( 5) - 09/19/05 09:13 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10438 Version: 5 Check-in Time: 19-Sep-2005 13:12:27 Title The Late Formation of Satellite Galaxies ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 13 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Mary E. Putman University of Michigan CoI: Ms. Emma Ryan-Weber University of Cambridge N CoI: Dr. Gerhardt R. Meurer The Johns Hopkins University N CoI: Dr. Kenneth C. Freeman Australian National University N CoI: Dr. Robert C. Kennicutt Jr. University of Arizona N CoI: Dr. Rachel Webster University of Melbourne N CoI: Dr. Sally Oey University of Michigan N CoI: Dr. Michael Drinkwater University of Queensland N ------------------------------------------------------------------------------------ Abstract Tiny isolated HII regions have been discovered up to 30 kpc from the closest galaxy in the NOAO Survey for Ionization in Neutral Gas Galaxies (SINGG). These halo HII regions can be ionized by only a few OB stars and seem to be most commonly found in interacting systems. They may represent the beginning of the formation of satellite galaxies at low redshift and/or are the source of the numerous intracluster planetary nebula. The halo HII regions are a unique mode of star formation in a low density and low metallicity environment and high resolution HST images are required to identify their underlying stellar populations. Determining the stellar populations of these HII regions will establish whether in-situ star formation is a significant contributor to the stellar content and enrichment of galactic halos and intergalactic space. In particular, ACS/HRC observations are required for their resolution, UV sensitivity, and wide wavelength coverage, allowing young and intermediate age populations to be identified. Parallel ACS/WFC observations will explore the possibility of a further stellar population in the interactive debris. The results of this project have implications on the formation of satellite galaxies, the origin of Galactic halo B stars, IGM ionization and enrichment, and star formation principles. ------------------------------------------------------------------------------------ 10438( 5) - 09/19/05 09:13 - [ 2] Observations Description ------------------------ The HRC will be used to observe the stellar populations of halo HII regions with UV (F250W), V (F555W), and I (F814W) filters. Parallel ACS/WFC observations in V and I will also be completed, either centered on the associated galaxy and/or the galaxy's halo. Each orbit will be split approximately as follows with small dithers between exposures: 5400s in the UV (6 exposures), 2700s in V (4 exposures), and 2700s in I (4 exposures). Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10438( 5) - 09/19/05 09:13 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC1533- UNIDENTIFIED, EMISSION RA=04H10M14.0000S +/- 0.1", J2000 V = V = 25.3 HII1+2 LINE NEBULA, STAR DEC=-56D11'36.00" +/- 0.1" 846.0 Halpha Flux = 1.1 x 10^\{-15\} (HII1) FORMING REGION, OPTICAL and 6.8 x 10^\{-16\} (HII2) erg s^\{-1\} EMITTER cm^\{-2\} Coordinate Source: Other_Source: Halpha images Comments: 21 Mpc from Tonry et al. (2001) 2 NGC1533-HII5 UNIDENTIFIED, EMISSION RA=04H10M15.5000S +/- 0.1", J2000 V = V = 25.9 LINE NEBULA, OPTICAL DEC=-56D06'15.00" +/- 0.1" 901.0 Halpha Flux = 5.0 x 10^\{-16\} erg s^\{- EMITTER, STAR FORMING 1\} cm^\{-2\} REGION Coordinate Source: Other_Source: Halpha images Comments: 21 Mpc from Tonry et al. (2001) 3 ESO149-G003- UNIDENTIFIED, EMISSION RA=23H51M51.3900S +/- 0.1", J2000 V = V = 25.8 HII1 LINE NEBULA, OPTICAL DEC=-52D34'34.20" +/- 0.1" 949.0 Halpha Flux = 6.9 x 10^\{-16\} erg s^\{- EMITTER, STAR FORMING 1\} cm^\{-2\} REGION Coordinate Source: Other_Source: Halpha images Comments: 6.5 Mpc from velocity 4 NGC4388-HII1 UNIDENTIFIED, EMISSION RA=12H25M31.9000S +/- 0.1", J2000 V = V = 27.2 LINE NEBULA, OPTICAL DEC=+12D43'47.70" +/- 0.1" 2670.0 Halpha Flux = 3.9 x 10^\{-16\} erg s^\{- EMITTER, STAR FORMING 1\} cm^\{-2\} REGION Coordinate Source: Other_Source: Gerhard et al. 2002 Comments: 17 Mpc from Tonry et al. (2001) 10438( 5) - 09/19/05 09:13 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-HRC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.198 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 44.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10438( 5) - 09/19/05 09:13 - [ 5] Visit: 01 Visit Priority: Visit Requirements: PCS MODE FINE; SCHED 30%; ORIENT 328.7D TO 350.8 D On Hold Comments: Additional Comments: Orientation chosen to observe region of HI debris and halo HII regions 4 and 5 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC1533-HII ACS/HRC ACCUM HRC F555W CR-SPLIT=2 1 1430 S PATTERN 1 1 1+2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC1533-HII ACS/HRC ACCUM HRC F250W CR-SPLIT=3 1 2904 S PATTERN 1 2 1+2 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC1533-HII ACS/HRC ACCUM HRC F814W CR-SPLIT=2 1 1446 S PATTERN 1 3 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC1533-HII1+2 1 ACS/HRC ACCUM HRC F555W 1 none none 1 1 N/A NGC1533-HII1+2 1 ACS/HRC ACCUM HRC F555W 1 none none 2 1 N/A NGC1533-HII1+2 1 ACS/HRC ACCUM HRC F555W 2 none none 1 1 N/A NGC1533-HII1+2 1 ACS/HRC ACCUM HRC F555W 2 none none 2 1 N/A NGC1533-HII1+2 2 ACS/HRC ACCUM HRC F250W 1 none none 1 2 N/A NGC1533-HII1+2 2 ACS/HRC ACCUM HRC F250W 1 none none 2 2 N/A NGC1533-HII1+2 2 ACS/HRC ACCUM HRC F250W 1 none none 3 2 N/A NGC1533-HII1+2 2 ACS/HRC ACCUM HRC F250W 2 none none 1 3 N/A NGC1533-HII1+2 2 ACS/HRC ACCUM HRC F250W 2 none none 2 3 N/A NGC1533-HII1+2 2 ACS/HRC ACCUM HRC F250W 2 none none 3 3 N/A NGC1533-HII1+2 3 ACS/HRC ACCUM HRC F814W 1 none none 1 4 N/A NGC1533-HII1+2 3 ACS/HRC ACCUM HRC F814W 1 none none 2 4 N/A NGC1533-HII1+2 3 ACS/HRC ACCUM HRC F814W 2 none none 1 4 N/A NGC1533-HII1+2 3 ACS/HRC ACCUM HRC F814W 2 none none 2 4 N/A 10438( 5) - 09/19/05 09:13 - [ 6] Visit: 02 Visit Priority: Visit Requirements: PCS MODE FINE; SCHED 30%; ORIENT 250.0D TO 290.0 D On Hold Comments: Additional Comments: Orientation chosen to observe the center of NGC 1533 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC1533-HII ACS/HRC ACCUM HRC F555W CR-SPLIT=2 1 1430 S PATTERN 1 1 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC1533-HII ACS/HRC ACCUM HRC F250W CR-SPLIT=3 1 2904 S PATTERN 1 2 5 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC1533-HII ACS/HRC ACCUM HRC F814W CR-SPLIT=2 1 1446 S PATTERN 1 3 5 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC1533-HII5 1 ACS/HRC ACCUM HRC F555W 1 none none 1 1 N/A NGC1533-HII5 1 ACS/HRC ACCUM HRC F555W 1 none none 2 1 N/A NGC1533-HII5 1 ACS/HRC ACCUM HRC F555W 2 none none 1 1 N/A NGC1533-HII5 1 ACS/HRC ACCUM HRC F555W 2 none none 2 1 N/A NGC1533-HII5 2 ACS/HRC ACCUM HRC F250W 1 none none 1 2 N/A NGC1533-HII5 2 ACS/HRC ACCUM HRC F250W 1 none none 2 2 N/A NGC1533-HII5 2 ACS/HRC ACCUM HRC F250W 1 none none 3 2 N/A NGC1533-HII5 2 ACS/HRC ACCUM HRC F250W 2 none none 1 3 N/A NGC1533-HII5 2 ACS/HRC ACCUM HRC F250W 2 none none 2 3 N/A NGC1533-HII5 2 ACS/HRC ACCUM HRC F250W 2 none none 3 3 N/A NGC1533-HII5 3 ACS/HRC ACCUM HRC F814W 1 none none 1 4 N/A NGC1533-HII5 3 ACS/HRC ACCUM HRC F814W 1 none none 2 4 N/A NGC1533-HII5 3 ACS/HRC ACCUM HRC F814W 2 none none 1 4 N/A NGC1533-HII5 3 ACS/HRC ACCUM HRC F814W 2 none none 2 4 N/A 10438( 5) - 09/19/05 09:13 - [ 7] Visit: 03 Visit Priority: Visit Requirements: PCS MODE FINE; SCHED 30% 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 ESO149-G003 ACS/HRC ACCUM HRC F555W CR-SPLIT=2 1 1398 S PATTERN 1 1 -HII1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ESO149-G003 ACS/HRC ACCUM HRC F250W CR-SPLIT=3 1 2955 S PATTERN 1 2 -HII1 ------------------------------------------------------------------------------------------------------------------------------------ 3 ESO149-G003 ACS/HRC ACCUM HRC F814W CR-SPLIT=2 1 1454 S PATTERN 1 3 -HII1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ESO149-G003-HII1 1 ACS/HRC ACCUM HRC F555W 1 none none 1 1 N/A ESO149-G003-HII1 1 ACS/HRC ACCUM HRC F555W 1 none none 2 1 N/A ESO149-G003-HII1 1 ACS/HRC ACCUM HRC F555W 2 none none 1 1 N/A ESO149-G003-HII1 1 ACS/HRC ACCUM HRC F555W 2 none none 2 1 N/A ESO149-G003-HII1 2 ACS/HRC ACCUM HRC F250W 1 none none 1 2 N/A ESO149-G003-HII1 2 ACS/HRC ACCUM HRC F250W 1 none none 2 2 N/A ESO149-G003-HII1 2 ACS/HRC ACCUM HRC F250W 1 none none 3 2 N/A ESO149-G003-HII1 2 ACS/HRC ACCUM HRC F250W 2 none none 1 3 N/A ESO149-G003-HII1 2 ACS/HRC ACCUM HRC F250W 2 none none 2 3 N/A ESO149-G003-HII1 2 ACS/HRC ACCUM HRC F250W 2 none none 3 3 N/A ESO149-G003-HII1 3 ACS/HRC ACCUM HRC F814W 1 none none 1 4 N/A ESO149-G003-HII1 3 ACS/HRC ACCUM HRC F814W 1 none none 2 4 N/A ESO149-G003-HII1 3 ACS/HRC ACCUM HRC F814W 2 none none 1 4 N/A ESO149-G003-HII1 3 ACS/HRC ACCUM HRC F814W 2 none none 2 4 N/A 10438( 5) - 09/19/05 09:13 - [ 8] Visit: 04 Visit Priority: Visit Requirements: PCS MODE FINE; SCHED 30%; ORIENT 120.0D TO 220.0 D On Hold Comments: Additional Comments: Orientation chosen to observe the east half of the disk and halo of NGC 4388 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4388-HII ACS/HRC ACCUM HRC F555W CR-SPLIT=2 1 1298 S PATTERN 1 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4388-HII ACS/HRC ACCUM HRC F250W CR-SPLIT=3 1 2754 S PATTERN 1 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC4388-HII ACS/HRC ACCUM HRC F814W CR-SPLIT=2 1 1352 S PATTERN 1 3 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC4388-HII1 1 ACS/HRC ACCUM HRC F555W 1 none none 1 1 N/A NGC4388-HII1 1 ACS/HRC ACCUM HRC F555W 1 none none 2 1 N/A NGC4388-HII1 1 ACS/HRC ACCUM HRC F555W 2 none none 1 1 N/A NGC4388-HII1 1 ACS/HRC ACCUM HRC F555W 2 none none 2 1 N/A NGC4388-HII1 2 ACS/HRC ACCUM HRC F250W 1 none none 1 2 N/A NGC4388-HII1 2 ACS/HRC ACCUM HRC F250W 1 none none 2 2 N/A NGC4388-HII1 2 ACS/HRC ACCUM HRC F250W 1 none none 3 2 N/A NGC4388-HII1 2 ACS/HRC ACCUM HRC F250W 2 none none 1 3 N/A NGC4388-HII1 2 ACS/HRC ACCUM HRC F250W 2 none none 2 3 N/A NGC4388-HII1 2 ACS/HRC ACCUM HRC F250W 2 none none 3 3 N/A NGC4388-HII1 3 ACS/HRC ACCUM HRC F814W 1 none none 1 4 N/A NGC4388-HII1 3 ACS/HRC ACCUM HRC F814W 1 none none 2 4 N/A NGC4388-HII1 3 ACS/HRC ACCUM HRC F814W 2 none none 1 4 N/A NGC4388-HII1 3 ACS/HRC ACCUM HRC F814W 2 none none 2 4 N/A 10438( 5) - 09/19/05 09:13 - [ 9] Summary Form for Proposal 10438 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures HRC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/HRC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2 CR-SPLIT=3 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE; SCHED 30%; ORIENT 328.7D TO 350.8 D PATTERN 1 1 PATTERN 1 2 PATTERN 1 3 PCS MODE FINE; SCHED 30%; ORIENT 250.0D TO 290.0 D PCS MODE FINE; SCHED 30% PCS MODE FINE; SCHED 30%; ORIENT 120.0D TO 220.0 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F250W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC1533-HII1+2 NGC1533-HII5 ESO149-G003-HII1 NGC4388-HII1 ------------------------------------------------------------------------------------------------------------------------------------