14351( 3) - 24-Sep-2015 15:10:29 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14351 Version: 3 Check-in Time: 24-Sep-2015 15:10:29 STScI Edit Number: 1 Title The Black Hole Population in Galactic Globular Clusters ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Laura Chomiuk Michigan State University Y CoI: Prof. Jay Strader Michigan State University N CoI: Dr. Craig Heinke University of Alberta N CoI: Dr. James Miller-Jones Curtin University N CoI: Dr. Gregory R. Sivakoff University of Alberta N CoI: Dr. Thomas J. Maccarone Texas Tech University N CoI: Dr. Arash Bahramian University of Alberta N ------------------------------------------------------------------------------------ Abstract We are engaged in a systematic search for stellar-mass black holes (BHs) in Galactic globular clusters, using a combination of deep radio continuum data, high-resolution X-ray observations, and optical images. Here we request 128 ksec of Chandra/ACIS observations to image the seven GCs in our sample with no or minimal archival Chandra data, enabling differentiation between accreting BHs, neutron stars, cataclysmic variables, and background galaxies. We also request two orbits of HST imaging to detect the optical counterpart to a BH candidate in one of these clusters. ------------------------------------------------------------------------------------ Observations Description ------------------------ These observations consistent of broadband imaging of the globular cluster NGC 6712 with WFC3 to characterize the counterpart to a candidate accreting stellar-mass black hole. In the first orbit we take one short exposure and then a 4-point dither in F275W. In the second orbit we observe with F606W and F814W, with most of the time going to an un-equal length 3-point dither in F606W and a 2-point line dither in F814W. This orbit is bracketed by short exposures in the two filters. ------------------------------------------------------------------------------------ 14351( 3) - 24-Sep-2015 15:10:29 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6712 STELLAR CLUSTER, RA=18H53M6.0800S +/- 0.1", J2000 V = 8.69 GLOBULAR CLUSTER DEC=-08D42'23.10" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 14351( 3) - 24-Sep-2015 15:10:29 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 14351( 3) - 24-Sep-2015 15:10:29 - [ 4] Visit: 01 Visit Requirements: ORIENT 155D TO 295 D; ORIENT 335D TO 115 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-6712 WFC3/UVI ACCUM UVIS-CENT F275W FLASH=12 1 30 S (30 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-6712 WFC3/UVI ACCUM UVIS-CENT F275W FLASH=12 1 575 S PATTERN 1 2 S ER (2300 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-6712 WFC3/UVI ACCUM UVIS-CENT F606W FLASH=12 1 7 S (7 S) S ER ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-6712 WFC3/UVI ACCUM UVIS-CENT F606W 1 665 S (665 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-6712 WFC3/UVI ACCUM UVIS-CENT F606W 1 399 S (399 POS TARG 0.092, 0.098 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-6712 WFC3/UVI ACCUM UVIS-CENT F606W 1 399 S (399 POS TARG 0.185, 0.197 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-6712 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-6712 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 POS TARG 0.099, 0.106 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-6712 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=12 1 7 S (7 S) S ER ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6712 1 WFC3/UVI ACCUM UVIS-CEN F275W none none none none 1 N/A S TER NGC-6712 2 WFC3/UVI ACCUM UVIS-CEN F275W 1 none none none 1 N/A S TER NGC-6712 2 WFC3/UVI ACCUM UVIS-CEN F275W 2 none none none 1 N/A S TER NGC-6712 2 WFC3/UVI ACCUM UVIS-CEN F275W 3 none none none 1 N/A S TER 14351( 3) - 24-Sep-2015 15:10:29 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-6712 2 WFC3/UVI ACCUM UVIS-CEN F275W 4 none none none 1 N/A S TER NGC-6712 3 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER NGC-6712 4 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER NGC-6712 5 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER NGC-6712 6 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 2 N/A S TER NGC-6712 7 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 N/A S TER NGC-6712 8 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 N/A S TER NGC-6712 9 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 2 N/A S TER 14351( 3) - 24-Sep-2015 15:10:29 - [ 6] Summary Form for Proposal 14351 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=12, FLASH=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 155D TO 295 D, ORIENT 335D TO 115 D, PATTERN 1 2, POS TARG 0.092, 0.098, POS TARG 0.099, 0.106, POS TARG 0.185, 0.197 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F275W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-6712 ------------------------------------------------------------------------------------------------------------------------------------