11012( 4) - 03/21/07 15:43 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11012 Version: 4 Check-in Time: 21-Mar-2007 19:43:32 STScI Edit Number: 0 Title NGC 4190-ULX1: The forgotten ULX ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 15 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Timothy Paul Roberts University of Durham CoI: Mr. Roy Erik Kilgard Smithsonian Institution Astrophysical N Observatory CoI: Dr. Andrew J. Levan The University of Warwick N CoI: Dr. Michael R. Goad University of Leicester N CoI: Ms. Ann-Marie Stobbart University of Leicester N CoI: Dr. Martin Ward University of Leicester N ------------------------------------------------------------------------------------ Abstract Although it ranks amongst the nearest (at d ~ 3 Mpc) and brightest (fx ~ 2e-12 erg/cm^2/s) ULXs, NGC 4190-ULX1 has not yet been observed in the modern era of X-ray astronomy. We propose to remedy this omission with three new observations designed to probe its underlying nature. Firstly, we will obtain a high precision X-ray position of the ULX using HRC-I. This will be used to identify an unique counterpart in new HST/ACS imaging, plausibly the first step towards deriving a dynamical mass function for this source. Finally, we will use an ACIS-S observation to derive the first high quality X-ray diagnostics (spectrum, light curve) of this ULX, with the aim of providing an interim assessment of the nature of the compact object underlying its extreme X-ray emission. ------------------------------------------------------------------------------------ 11012( 4) - 03/21/07 15:43 - [ 2] Observations Description ------------------------ We request observations of NGC 4190 X1 with the aim of identifying the optical counterpart of this nearby ULX. Given the loss of ACS we will now conduct these observations with WFPC2 using the F300W, F450W and F606W filters. We will place the target at the WFALL aperture (i.e. at the corner of WF3) and conduct a standard 4 point dither pattern. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11012( 4) - 03/21/07 15:43 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4190-X1 UNIDENTIFIED, ACCRETION RA=12H13M45.4000S +/- 10", J2000 V = 24.0+/-2.0 DISK, X-RAY EMITTER DEC=+36D37'55.00" +/- 10" Reference Frame: Other: ROSAT 11012( 4) - 03/21/07 15:43 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFPC2-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.559017 Line_Spacing 0.559017 Coordinate_Frame POS-TARG Pattern_Orient 26.56505 Angle_Between_Sides 143.130102 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 11012( 4) - 03/21/07 15:43 - [ 5] Visit: 02 Visit Priority: 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 NGC4190-X1 WFPC2 IMAGE WFALL F300W CR-SPLIT=NO 1 1100 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4190-X1 WFPC2 IMAGE WFALL F450W CR-SPLIT=NO 1 1100 S PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC4190-X1 WFPC2 IMAGE WFALL F606W 1 400 S PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC4190-X1 1 WFPC2 IMAGE WFALL F300W 1 none none none 1 N/A NGC4190-X1 1 WFPC2 IMAGE WFALL F300W 2 none none none 1 N/A NGC4190-X1 1 WFPC2 IMAGE WFALL F300W 3 none none none 2 N/A NGC4190-X1 1 WFPC2 IMAGE WFALL F300W 4 none none none 2 N/A NGC4190-X1 2 WFPC2 IMAGE WFALL F450W 1 none none none 3 N/A NGC4190-X1 2 WFPC2 IMAGE WFALL F450W 2 none none none 3 N/A NGC4190-X1 2 WFPC2 IMAGE WFALL F450W 3 none none none 4 N/A NGC4190-X1 2 WFPC2 IMAGE WFALL F450W 4 none none none 4 N/A NGC4190-X1 3 WFPC2 IMAGE WFALL F606W 1 none none none 5 N/A NGC4190-X1 3 WFPC2 IMAGE WFALL F606W 2 none none none 5 N/A NGC4190-X1 3 WFPC2 IMAGE WFALL F606W 3 none none none 5 N/A NGC4190-X1 3 WFPC2 IMAGE WFALL F606W 4 none none none 5 N/A 11012( 4) - 03/21/07 15:43 - [ 6] Summary Form for Proposal 11012 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFALL ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1; PATTERN 1 2; PATTERN 1 3; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F300W F450W F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC4190-X1 ------------------------------------------------------------------------------------------------------------------------------------