11517( 6) - 22-Apr-2008 12:23:44 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11517 Version: 6 Check-in Time: 22-Apr-2008 12:23:44 STScI Edit Number: 0 Title A >10000 solar mass black hole ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO/DD 16 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Peter Jonker Smithsonian Institution Astrophysical Observatory CoI: Dr. Manuel Torres Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract The X-ray source XMMUJ134736.6+173403 has recently been discovered serendipitously. Its X-ray position coincides with two interacting galaxies, one of which is a Seyfert II. The X-ray variability and spectrum rule out an association with the Seyfert II. Carpano et al. (2008) suggest that the source is a foreground quiescent low-mass X-ray binary (unrelated to the galaxy-pair). Our recent optical photometry rules out such a scenario since the counterpart to the low-mass X-ray binary should have been detected. Furthermore, we find an extended source in the XMM error circle. Optical spectroscopy shows emission lines, such as those found in ULX nebulae, redshifted to the same redshift as that of the pair of interacting galaxies. Swift/UVOT observations show that the spectrum of the emission nebula is very blue. If this emission nebula is indeed associated with the X-ray source it implies that the X-ray source is a ULX. We propose here to obtain an ACS/SBC image to accurately determine the magnitude and the extend of the nebula and to investigate if the ULX/nebula emission can be responsible for the observed X-ray emission by extending the SED to ~1300 angstrom. ------------------------------------------------------------------------------------ Observations Description ------------------------ We request a short HST ACS observation using the F122M filter in order to: -Extend the SED down to 1300 A. A further brightening of the nebula in comparison with the Seyfert II in the F122M band would strengthen the association of the X-ray source with a ULX and the nebula. -Determine the size of the nebula accurately. We determined the exposure time using the UVOT UVW2 flux estimate. We extrapolated the SED to 1300 A, from this we find that a 4x600 s exposure would give us a SN of >10. Real Time Justification ----------------------- Calibration Justification ------------------------- 11517( 6) - 22-Apr-2008 12:23:44 - [ 2] Additional Comments ------------------- ------------------------------------------------------------------------------------ 11517( 6) - 22-Apr-2008 12:23:44 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 XMMUJ134736. GALAXY, EMISSION LINE RA=13H47M36.8050S +/- 0.25", J2000 V = 22 +/- 1 F(1900)=8.6E-17 6+173403 NEBULA, INTERACTING DEC=+17D34'2.80" +/- 0.25" GALAXY Reference Frame: ICRS Comments: ------------------------------------------------------------------------------------------------------------------------------------ 11517( 6) - 22-Apr-2008 12:23:44 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-SBC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.179 Line_Spacing 0.116 Coordinate_Frame POS-TARG Pattern_Orient 20.02 Angle_Between_Sides 63.65 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 11517( 6) - 22-Apr-2008 12:23:44 - [ 5] Visit: 01 Visit Priority: Visit Requirements: BEFORE 19-MAY-2008:00:00:00 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 XMMUJ134736 ACS/SBC ACCUM SBC F122M 1 600 S PATTERN 2 1 .6+173403 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ XMMUJ134736.6+17340 1 ACS/SBC ACCUM SBC F122M 1 none none none 1 632.0 S 3 XMMUJ134736.6+17340 1 ACS/SBC ACCUM SBC F122M 2 none none none 1 632.0 S 3 XMMUJ134736.6+17340 1 ACS/SBC ACCUM SBC F122M 3 none none none 1 632.0 S 3 XMMUJ134736.6+17340 1 ACS/SBC ACCUM SBC F122M 4 none none none 1 632.0 S 3 11517( 6) - 22-Apr-2008 12:23:44 - [ 6] Summary Form for Proposal 11517 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures SBC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 19-MAY-2008:00:00:00, PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F122M ------------------------------------------------------------------------------------------------------------------------------------ Target Names XMMUJ134736.6+173403 ------------------------------------------------------------------------------------------------------------------------------------