12756( 2) - 01-Sep-2011 15:47:14 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12756 Version: 2 Check-in Time: 01-Sep-2011 15:47:14 STScI Edit Number: 0 Title X-raying the spectacular star-forming trail behind IC 3418 ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Ming Sun The University of Virginia CoI: Ms. Aeree Y Chung Yonsei University N CoI: Dr. Elke Roediger Jacobs University Bremen N CoI: Dr. Craig L. Sarazin The University of Virginia N CoI: Dr. Paul E. J. Nulsen Smithsonian Institution Astrophysical N Observatory CoI: Dr. William R. Forman Smithsonian Institution Astrophysical N Observatory CoI: Dr. Christine Forman-Jones Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract The ICM has long been proposed to play a vital role in galaxy evolution in clusters, through stripping of the cold gas. Studies of gaseous tails behind cluster late-type galaxies have shed light on the energy transfer in the multi-phase gas, demonstrated by the recent discoveries of X-ray tails, intracluster star formation and ULXs in the stripped gas. It is now known that star formation indeed happens commonly in the stripped ISM, but a lot of detail is still unknown. We propose a 35 ks ACIS-S observation of a dwarf galaxy with a remarkable star-forming trail in the Virgo cluster. Its proximity provides an unprecedented opportunity to study the evolution of the stripped gas, intracluster X-ray binaries and star formation. Joint HST and EVLA data observations are also requested. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use WFC3 and ACS to study the dwarf galaxy IC 3418 and its star-forming trail in the Virgo cluster. The WFC3 F275W data in one orbit will be used to study the young star clusters in the galaxy and the gaseous tail. We will also get the F475W and F814W data. The data will be compared with the similar data we have for ESO 137-001 and ESO 137-002 in A3627. Real Time Justification ----------------------- Calibration Justification ------------------------- 12756( 2) - 01-Sep-2011 15:47:14 - [ 2] Additional Comments ------------------- ------------------------------------------------------------------------------------ 12756( 2) - 01-Sep-2011 15:47:14 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 IC-3418-POS1 GALAXY, DWARF RA=12H29M43.8060S +/- 0.1", J2000 V = 15 SPHEROIDAL, FILAMENT, DEC=+11D24'6.16" +/- 0.1" KNOT, LSB, STAR FORMING REGION Reference Frame: ICRS Comments: Position 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 IC-3418-POS2 GALAXY, DWARF RA=12H29M51.8400S +/- 0.1", J2000 V = 15 SPHEROIDAL, FILAMENT, DEC=+11D22'32.31" +/- 0.1" KNOT, LSB, STAR FORMING REGION Reference Frame: ICRS Comments: Position 2 ------------------------------------------------------------------------------------------------------------------------------------ 12756( 2) - 01-Sep-2011 15:47:14 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-MOS-DITH-LINE Pattern_Purpose MOSAIC Number_Of_Points 3 Point_Spacing 2.4 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.754 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 3.011 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12756( 2) - 01-Sep-2011 15:47:14 - [ 5] Visit: 01 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 IC-3418-POS ACS/WFC ACCUM WFC F814W 1 339 S PATTERN 2 1-2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 IC-3418-POS ACS/WFC ACCUM WFC F475W 1 728 S 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 IC-3418-POS WFC3/UVI ACCUM UVIS-FIX F275W 1 882 S PATTERN 1 3 1 S ------------------------------------------------------------------------------------------------------------------------------------ 4 IC-3418-POS WFC3/UVI ACCUM UVIS-FIX F275W 1 882 S PATTERN 1 4 2 S ------------------------------------------------------------------------------------------------------------------------------------ 5 IC-3418-POS ACS/WFC ACCUM WFC F814W 1 339 S PATTERN 2 5-6 2 ------------------------------------------------------------------------------------------------------------------------------------ 6 IC-3418-POS ACS/WFC ACCUM WFC F475W 1 728 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ IC-3418-POS1 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A IC-3418-POS1 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A IC-3418-POS1 2 ACS/WFC ACCUM WFC F475W 1 none none none 1 N/A IC-3418-POS1 2 ACS/WFC ACCUM WFC F475W 2 none none none 1 N/A IC-3418-POS1 3 WFC3/UVI ACCUM UVIS-FIX F275W 1 none none none 2 N/A S IC-3418-POS1 3 WFC3/UVI ACCUM UVIS-FIX F275W 2 none none none 2 N/A S IC-3418-POS1 3 WFC3/UVI ACCUM UVIS-FIX F275W 3 none none none 2 N/A S IC-3418-POS2 4 WFC3/UVI ACCUM UVIS-FIX F275W 1 none none none 3 N/A S IC-3418-POS2 4 WFC3/UVI ACCUM UVIS-FIX F275W 2 none none none 3 N/A S IC-3418-POS2 4 WFC3/UVI ACCUM UVIS-FIX F275W 3 none none none 3 N/A S IC-3418-POS2 5 ACS/WFC ACCUM WFC F814W 1 none none none 4 N/A IC-3418-POS2 5 ACS/WFC ACCUM WFC F814W 2 none none none 4 N/A 12756( 2) - 01-Sep-2011 15:47:14 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ IC-3418-POS2 6 ACS/WFC ACCUM WFC F475W 1 none none none 4 N/A IC-3418-POS2 6 ACS/WFC ACCUM WFC F475W 2 none none none 4 N/A 12756( 2) - 01-Sep-2011 15:47:14 - [ 7] Summary Form for Proposal 12756 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-FIX, WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 3, PATTERN 1 4, PATTERN 2 1-2, PATTERN 2 5-6 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F275W, F475W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names IC-3418-POS1, IC-3418-POS2 ------------------------------------------------------------------------------------------------------------------------------------