12369( 13) - 15-Apr-2011 12:42:23 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12369 Version: 13 Check-in Time: 15-Apr-2011 12:42:23 STScI Edit Number: 11 Title Constraining the Transient Black Hole (Bh) Low-Mass X-Ray Binary (Lmxb) Population ------------------------------------------------------------------------------------ Type Cycle GO 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Giuseppina Fabbiano Smithsonian Institution Astrophysical Observatory CoI: Dr. Tassos Fragos Northwestern University N CoI: Dr. Vicky Kalogera Northwestern University N CoI: Dr. Dong-Woo Kim Smithsonian Institution Astrophysical N Observatory CoI: Dr. Andreas Zezas Smithsonian Institution Astrophysical N Observatory CoI: Prof. J. Gallagher III University of Wisconsin - Madison N CoI: Dr. Andrew R. King University of Leicester N CoI: Dr. Jay M. Strader Harvard University N CoI: Prof. Jean P. Brodie University of California - Santa Cruz N ------------------------------------------------------------------------------------ Abstract Observations of X-ray transients have posed crucial constraints to the processes and evolution of accretion disks in LMXB populations. Yet, the data to constrain the transient behavior of the most luminous BH LMXBs does not exist to date. We propose to study this rare component of the LMXB population, by observing the giant Virgo elliptical NGC4649 with ACIS-S (twice for 100 ks each). The extraordinarily rich population of ~58 BH candidates with LX> 2 1038 erg s-1 (40 with LX> 3 1038 erg s-1) of this galaxy provides the ideal sample for this study. ------------------------------------------------------------------------------------ Observations Description ------------------------ The primary observations with ACS/WFC are designed for photometry in F475W and F850LP of globular clusters in the massive elliptical galaxy NGC 4649. These observations complement deep Chandra imaging and the goal is to cross-match X-ray sources with HST-identified clusters. The use of two filters gives color information used to estimate rough metallicities of the clusters. For each filter we use two exposures and a simple line dither to cover the chip gap and correct pixel-level defects and cosmic rays. Given 54 min of visibility per orbit, 34 min are available after overheads for science exposures. Exposure times of 810 sec in F475W and 1200 sec in F850LP give approximately equal signal-to-noise in the two bands. NGC 4649 has one archival ACS pointing. The five additional pointings in this proposal, arranged in a quasi-mosaic, cover the remainder of the Chandra field of view (excepting foreground spiral in the northwest corner). The need to match both Chandra and the existing HST imaging in a mosaic leads to the restrictive orientation requirements. 12369( 13) - 15-Apr-2011 12:42:23 - [ 2] As described in the original proposal, we will make coordinated parallel observations with WFC3/IR in F160W during the latter part of each orbit. This will allow improved metallicity estimates for a subset of clusters. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12369( 13) - 15-Apr-2011 12:42:23 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4649-POS1 GALAXY, ELLIPTICAL RA=12H43M51.9540S +/- 0.1", J2000 V = 1117 V = 10 +/- 0.2 DEC=+11D33'58.27" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4649-POS2 GALAXY, ELLIPTICAL RA=12H43M48.9800S +/- 0.1", J2000 V = 1117 V = 10 +/- 0.2 DEC=+11D31'12.38" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC4649-POS3 GALAXY, ELLIPTICAL RA=12H43M42.6430S +/- 0.1", J2000 V = 1117 V = 10 +/- 0.2 DEC=+11D36'0.18" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC4649-POS4 GALAXY, ELLIPTICAL RA=12H43M35.0660S +/- 0.1", J2000 V = 1117 V = 10 +/- 0.2 DEC=+11D30'43.16" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC4649-POS5 GALAXY, ELLIPTICAL RA=12H43M24.9200S +/- 0.1", J2000 V = 1117 V = 10 +/- 0.2 DEC=+11D33'7.88" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 12369( 13) - 15-Apr-2011 12:42:23 - [ 4] 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 ------------------------------------------------------------------------------------------------------------------------------------ 12369( 13) - 15-Apr-2011 12:42:23 - [ 5] Visit: 01 Visit Requirements: ORIENT 131D TO 133 D; SEQ 01, 02, 03, 04 WITHIN 5 Orbits 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 NGC4649-POS ACS/WFC ACCUM WFCENTER F475W 1 405 S GS ACQ SCENARIO SINGLE; 1 see below PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4649-POS ACS/WFC ACCUM WFCENTER F850LP 1 600 S PATTERN 1 2-3; PAR 3 1 see below WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/IR MULTIAC IR-UVIS-C F160W NSAMP=13, SAMP-SEQ=STEP100 1 DEF CUM ENTER ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC4649-POS1 1 ACS/WFC ACCUM WFCENTER F475W 1 none none none 1 444.0 S NGC4649-POS1 1 ACS/WFC ACCUM WFCENTER F475W 2 none none none 1 444.0 S NGC4649-POS1 2 ACS/WFC ACCUM WFCENTER F850LP 1 none none none 1 639.0 S NGC4649-POS1 2 ACS/WFC ACCUM WFCENTER F850LP 2 none none none 1 639.0 S ANY 3 WFC3/IR MULTIAC IR-UVIS- F160W 1 none none none 1 N/A CUM CENTER ANY 3 WFC3/IR MULTIAC IR-UVIS- F160W 2 none none none 1 N/A CUM CENTER 12369( 13) - 15-Apr-2011 12:42:23 - [ 6] Visit: 02 Visit Requirements: ORIENT 106D TO 108 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 NGC4649-POS ACS/WFC ACCUM WFCENTER F475W 1 405 S GS ACQ SCENARIO SINGLE; 2 see below PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4649-POS ACS/WFC ACCUM WFCENTER F850LP 1 600 S PATTERN 1 2-3; PAR 3 2 see below WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/IR MULTIAC IR-UVIS-C F160W NSAMP=13, SAMP-SEQ=STEP100 1 DEF CUM ENTER ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC4649-POS2 1 ACS/WFC ACCUM WFCENTER F475W 1 none none none 1 444.0 S NGC4649-POS2 1 ACS/WFC ACCUM WFCENTER F475W 2 none none none 1 444.0 S NGC4649-POS2 2 ACS/WFC ACCUM WFCENTER F850LP 1 none none none 1 639.0 S NGC4649-POS2 2 ACS/WFC ACCUM WFCENTER F850LP 2 none none none 1 639.0 S ANY 3 WFC3/IR MULTIAC IR-UVIS- F160W 1 none none none 1 N/A CUM CENTER ANY 3 WFC3/IR MULTIAC IR-UVIS- F160W 2 none none none 1 N/A CUM CENTER 12369( 13) - 15-Apr-2011 12:42:23 - [ 7] Visit: 03 Visit Requirements: ORIENT 124D TO 126 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 NGC4649-POS ACS/WFC ACCUM WFCENTER F475W 1 405 S GS ACQ SCENARIO ONEB1B3; 3 see below PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4649-POS ACS/WFC ACCUM WFCENTER F850LP 1 600 S PATTERN 1 2-3; PAR 3 3 see below WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/IR MULTIAC IR-UVIS-C F160W NSAMP=13, SAMP-SEQ=STEP100 1 DEF CUM ENTER ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC4649-POS3 1 ACS/WFC ACCUM WFCENTER F475W 1 none none none 1 444.0 S NGC4649-POS3 1 ACS/WFC ACCUM WFCENTER F475W 2 none none none 1 444.0 S NGC4649-POS3 2 ACS/WFC ACCUM WFCENTER F850LP 1 none none none 1 639.0 S NGC4649-POS3 2 ACS/WFC ACCUM WFCENTER F850LP 2 none none none 1 639.0 S ANY 3 WFC3/IR MULTIAC IR-UVIS- F160W 1 none none none 1 N/A CUM CENTER ANY 3 WFC3/IR MULTIAC IR-UVIS- F160W 2 none none none 1 N/A CUM CENTER 12369( 13) - 15-Apr-2011 12:42:23 - [ 8] Visit: 04 Visit Requirements: ORIENT 106D TO 108 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 NGC4649-POS ACS/WFC ACCUM WFCENTER F475W 1 405 S GS ACQ SCENARIO SINGLE; 4 see below PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4649-POS ACS/WFC ACCUM WFCENTER F850LP 1 600 S PATTERN 1 2-3; PAR 3 4 see below WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY WFC3/IR MULTIAC IR-UVIS-C F160W NSAMP=13, SAMP-SEQ=STEP100 1 DEF CUM ENTER ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC4649-POS ACS/WFC ACCUM WFCENTER F475W 1 405 S GS ACQ SCENARIO ONEB1B3; 5 see below PATTERN 1 4 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC4649-POS ACS/WFC ACCUM WFCENTER F850LP 1 600 S PATTERN 1 5-6; PAR 6 5 see below WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFC3/IR MULTIAC IR-UVIS-C F160W NSAMP=13, SAMP-SEQ=STEP100 1 DEF CUM ENTER ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC4649-POS4 1 ACS/WFC ACCUM WFCENTER F475W 1 none none none 1 444.0 S NGC4649-POS4 1 ACS/WFC ACCUM WFCENTER F475W 2 none none none 1 444.0 S NGC4649-POS4 2 ACS/WFC ACCUM WFCENTER F850LP 1 none none none 1 639.0 S NGC4649-POS4 2 ACS/WFC ACCUM WFCENTER F850LP 2 none none none 1 639.0 S ANY 3 WFC3/IR MULTIAC IR-UVIS- F160W 1 none none none 1 N/A CUM CENTER ANY 3 WFC3/IR MULTIAC IR-UVIS- F160W 2 none none none 1 N/A CUM CENTER NGC4649-POS5 4 ACS/WFC ACCUM WFCENTER F475W 1 none none none 2 444.0 S NGC4649-POS5 4 ACS/WFC ACCUM WFCENTER F475W 2 none none none 2 444.0 S NGC4649-POS5 5 ACS/WFC ACCUM WFCENTER F850LP 1 none none none 2 639.0 S NGC4649-POS5 5 ACS/WFC ACCUM WFCENTER F850LP 2 none none none 2 639.0 S ANY 6 WFC3/IR MULTIAC IR-UVIS- F160W 1 none none none 2 N/A CUM CENTER ANY 6 WFC3/IR MULTIAC IR-UVIS- F160W 2 none none none 2 N/A CUM CENTER 12369( 13) - 15-Apr-2011 12:42:23 - [ 9] Summary Form for Proposal 12369 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-UVIS-CENTER, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=13, SAMP-SEQ=STEP100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO ONEB1B3, GS ACQ SCENARIO SINGLE, ORIENT 106D TO 108 D, ORIENT 124D TO 126 D, ORIENT 131D TO 133 D, PAR 3 WITH 2, PAR 6 WITH 5, PATTERN 1 1, PATTERN 1 2-3, PATTERN 1 4, PATTERN 1 5-6, SEQ 01, 02, 03, 04 WITHIN 5 Orbits ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F475W, F850LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names ANY, NGC4649-POS1, NGC4649-POS2, NGC4649-POS3, NGC4649-POS4, NGC4649-POS5 ------------------------------------------------------------------------------------------------------------------------------------