12375( 2) - 13-Sep-2010 13:38:56 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12375 Version: 2 Check-in Time: 13-Sep-2010 13:38:56 STScI Edit Number: 0 Title Optical Counterpart of the ULX in NGC 247 ------------------------------------------------------------------------------------ Type Cycle GO 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Hua Feng Tsinghua University CoI: Dr. Philip Kaaret University of Iowa Y ------------------------------------------------------------------------------------ Abstract A recent XMM-Newton observation revealed a highly interesting ultraluminous X-ray source (ULX) in NGC 247. It is similar to Galactic black hole binaries (BHBs) at the thermal dominant state while the cool, ultraluminous disk suggests the presence of an intermediate mass black hole. ULXs are rarely found in the thermal dominant state and this source would provide us a precious laboratory to study the connection between ULXs and Galactic BHBs. We propose Chandra and HST observations of the source to accurately measure its X-ray position, identify a unique optical counterpart, and search for optical nebulosity. Identification of the optical counterpart will help constrain its evolutionary history and physical nature. ------------------------------------------------------------------------------------ Observations Description ------------------------ Searching for the optical counterpart of NGC 247 ULX Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12375( 2) - 13-Sep-2010 13:38:56 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC247ULXUP UNIDENTIFIED, X-RAY RA=00H46M56.3700S +/- 0.1", J2000 V = 21 EMITTER DEC=-20D44'27.94" +/- 0.1" Reference Frame: ICRS Comments: ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC247ULXDN UNIDENTIFIED, X-RAY RA=00H46M59.3770S +/- 0.1", J2000 V = 21 EMITTER DEC=-20D47'1.75" +/- 0.1" Reference Frame: ICRS Comments: ------------------------------------------------------------------------------------------------------------------------------------ 12375( 2) - 13-Sep-2010 13:38:56 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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 ------------------------------------------------------------------------------------------------------------------------------------ 12375( 2) - 13-Sep-2010 13:38:56 - [ 4] Visit: 01 Visit Requirements: ORIENT 345.0D TO 10.0 D 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 NGC247ULXDN ACS/WFC ACCUM WFCENTER F658N 1 600 S PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC247ULXDN ACS/WFC ACCUM WFCENTER F435W 1 452 S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC247ULXDN ACS/WFC ACCUM WFCENTER F606W 1 423 S PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC247ULXUP ACS/WFC ACCUM WFCENTER F606W 1 423 S PATTERN 1 4 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC247ULXDN 1 ACS/WFC ACCUM WFCENTER F658N 1 none none none 1 N/A NGC247ULXDN 1 ACS/WFC ACCUM WFCENTER F658N 2 none none none 1 N/A NGC247ULXDN 2 ACS/WFC ACCUM WFCENTER F435W 1 none none none 1 N/A NGC247ULXDN 2 ACS/WFC ACCUM WFCENTER F435W 2 none none none 1 N/A NGC247ULXDN 3 ACS/WFC ACCUM WFCENTER F606W 1 none none none 2 N/A NGC247ULXDN 3 ACS/WFC ACCUM WFCENTER F606W 2 none none none 2 N/A NGC247ULXUP 4 ACS/WFC ACCUM WFCENTER F606W 1 none none none 2 N/A NGC247ULXUP 4 ACS/WFC ACCUM WFCENTER F606W 2 none none none 2 N/A 12375( 2) - 13-Sep-2010 13:38:56 - [ 5] Summary Form for Proposal 12375 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 345.0D TO 10.0 D, PATTERN 1 1-2, PATTERN 1 3, PATTERN 1 4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F435W, F606W, F658N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC247ULXDN, NGC247ULXUP ------------------------------------------------------------------------------------------------------------------------------------