16068( 4) - 01-Apr-2021 10:11:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16068 Version: 4 Check-in Time: 01-Apr-2021 10:11:42 STScI Edit Number: 0 Title The most massive low density globular cluster ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Thomas J. Maccarone Texas Tech University Y CoI: Dr. Liliana Elizabeth Rivera University of Alberta N Sandoval CoI: Dr. Craig Heinke University of Alberta N ------------------------------------------------------------------------------------ Abstract We propose to make a Chandra observation of a newly discovered high mass, low density globular cluster. This cluster has properties largely similar to that of Omega Centauri in terms of its stellar mass and its ratio of tidal to core radius, but its characteristic radii are a factor of about 3 larger than Omega Cen's. As a result, this is the first Milky Way cluster for which the stellar density is small enough that dynamical formation and destruction of close binaries will be unimportant, while having a large enough stellar mass that it can be expected to show some interacting binaries anyway. It will be the first object that can be used to characterize the baseline rate of production of these systems in a low metallicity, old stellar population. ------------------------------------------------------------------------------------ Observations Description ------------------------ This proposal is to do a 2*2 mosaic with WFC3. Each observation will have 1000 seconds each in 300X and 606W, and 245 seconds in 814W. We note that in finalizing this proposal, we discovered a typo in the coordinates for the object of interest and have fixed that, which is the reason for the mismatch. ------------------------------------------------------------------------------------ 16068( 4) - 01-Apr-2021 10:11:42 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 FSR1758 STELLAR CLUSTER, RA=17H31M12.0000S +/- 1", J2000 V = 7 +/- 1 GLOBULAR CLUSTER DEC=-39D48'30.00" +/- 1" Reference Frame: ICRS Extended: YES Comments: The apparent magnitude of 7 is integrated over a region somewhat larger than the mosaic we propose to observe. ------------------------------------------------------------------------------------------------------------------------------------ 16068( 4) - 01-Apr-2021 10:11:42 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 16068( 4) - 01-Apr-2021 10:11:42 - [ 4] Visit: 05 Visit Requirements: BETWEEN 01-APR-2021:00:00:00 AND 01-NOV-2021:00:00:00 On Hold Comments: Additional Comments: This is a modification of Visit 01 as an example of using a 3-point dither for the 300X exposures and a 2-point dither for the 606W exposures, in each case replacing the cosmic-ray-split pairs of exposures. The dithers generally give a better result because they can help get rid of bad pixels or columns, and 3-point dithers give better results than 2-point dithers (or CR-split pairs). The revised visit 05 has slightly greater total exposure time in 300x, a bit less in 606W, and the same in 814W. The minimum time is 353 s to fit parallel buffer dumps in during exposures; that's why we use that. Note that if you prefer this example Visit 05 in place of Visit 01, you should replace Visit 01 with it, and then modify Visit 2, 3, and 4 accordingly. Be careful to retain the POSTARGs so that you get your 2x2 mozaic. You may need to cut and paste the X and Y POSTARGs from Visits 2, 3, and 4 that were defined by the mosaic template. You can verify the layout using Aladin's view. 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 FSR1758 WFC3/UVI ACCUM UVIS-CENT F300X FLASH=10 1 353 S POS TARG S ER (1059 S) -73.55487747622576, -79.379823084808; PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 FSR1758 WFC3/UVI ACCUM UVIS-CENT F606W 1 403 S (806 POS TARG S ER S) -73.55487747622576, -79.379823084808; PATTERN 2 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 FSR1758 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=8 1 237 S (237 POS TARG S ER S) -73.55487747622576, -79.379823084808 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 1 none none none 1 N/A S TER FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 2 none none none 1 N/A S TER FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 3 none none none 1 N/A S TER FSR1758 2 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER FSR1758 2 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER 16068( 4) - 01-Apr-2021 10:11:42 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ FSR1758 3 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 16068( 4) - 01-Apr-2021 10:11:42 - [ 6] Visit: 06 Visit Requirements: SAME ORIENT AS 05; BETWEEN 01-APR-2021:00:00:00 AND 01-NOV-2021:00:00:00 On Hold Comments: Additional Comments: This is a modification of Visit 01 as an example of using a 3-point dither for the 300X exposures and a 2-point dither for the 606W exposures, in each case replacing the cosmic-ray-split pairs of exposures. The dithers generally give a better result because they can help get rid of bad pixels or columns, and 3-point dithers give better results than 2-point dithers (or CR-split pairs). The revised visit 05 has slightly greater total exposure time in 300x, a bit less in 606W, and the same in 814W. The minimum time is 353 s to fit parallel buffer dumps in during exposures; that's why we use that. Note that if you prefer this example Visit 05 in place of Visit 01, you should replace Visit 01 with it, and then modify Visit 2, 3, and 4 accordingly. Be careful to retain the POSTARGs so that you get your 2x2 mozaic. You may need to cut and paste the X and Y POSTARGs from Visits 2, 3, and 4 that were defined by the mosaic template. You can verify the layout using Aladin's view. 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 FSR1758 WFC3/UVI ACCUM UVIS-CENT F300X FLASH=10 1 353 S POS TARG S ER (1059 S) 73.55487747622576, -69.09290691519202; PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 FSR1758 WFC3/UVI ACCUM UVIS-CENT F606W 1 403 S (806 POS TARG S ER S) 73.55487747622576, -69.09290691519202; PATTERN 2 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 FSR1758 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=8 1 237 S (237 POS TARG S ER S) 73.55487747622576, -69.09290691519202 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 1 none none none 1 N/A S TER FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 2 none none none 1 N/A S TER FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 3 none none none 1 N/A S TER FSR1758 2 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER FSR1758 2 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER 16068( 4) - 01-Apr-2021 10:11:42 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ FSR1758 3 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 16068( 4) - 01-Apr-2021 10:11:42 - [ 8] Visit: 07 Visit Requirements: SAME ORIENT AS 05; BETWEEN 01-APR-2021:00:00:00 AND 01-NOV-2021:00:00:00 On Hold Comments: Additional Comments: This is a modification of Visit 01 as an example of using a 3-point dither for the 300X exposures and a 2-point dither for the 606W exposures, in each case replacing the cosmic-ray-split pairs of exposures. The dithers generally give a better result because they can help get rid of bad pixels or columns, and 3-point dithers give better results than 2-point dithers (or CR-split pairs). The revised visit 05 has slightly greater total exposure time in 300x, a bit less in 606W, and the same in 814W. The minimum time is 353 s to fit parallel buffer dumps in during exposures; that's why we use that. Note that if you prefer this example Visit 05 in place of Visit 01, you should replace Visit 01 with it, and then modify Visit 2, 3, and 4 accordingly. Be careful to retain the POSTARGs so that you get your 2x2 mozaic. You may need to cut and paste the X and Y POSTARGs from Visits 2, 3, and 4 that were defined by the mosaic template. You can verify the layout using Aladin's view. 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 FSR1758 WFC3/UVI ACCUM UVIS-CENT F300X FLASH=10 1 353 S POS TARG S ER (1059 S) -73.55487747622576, 69.09290691519202; PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 FSR1758 WFC3/UVI ACCUM UVIS-CENT F606W 1 403 S (806 POS TARG S ER S) -73.55487747622576, 69.09290691519202; PATTERN 2 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 FSR1758 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=8 1 237 S (237 POS TARG S ER S) -73.55487747622576, 69.09290691519202 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 1 none none none 1 N/A S TER FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 2 none none none 1 N/A S TER FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 3 none none none 1 N/A S TER FSR1758 2 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER FSR1758 2 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER 16068( 4) - 01-Apr-2021 10:11:42 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ FSR1758 3 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 16068( 4) - 01-Apr-2021 10:11:42 - [ 10] Visit: 08 Visit Requirements: SAME ORIENT AS 05; BETWEEN 01-APR-2021:00:00:00 AND 01-NOV-2021:00:00:00 On Hold Comments: Additional Comments: This is a modification of Visit 01 as an example of using a 3-point dither for the 300X exposures and a 2-point dither for the 606W exposures, in each case replacing the cosmic-ray-split pairs of exposures. The dithers generally give a better result because they can help get rid of bad pixels or columns, and 3-point dithers give better results than 2-point dithers (or CR-split pairs). The revised visit 05 has slightly greater total exposure time in 300x, a bit less in 606W, and the same in 814W. The minimum time is 353 s to fit parallel buffer dumps in during exposures; that's why we use that. Note that if you prefer this example Visit 05 in place of Visit 01, you should replace Visit 01 with it, and then modify Visit 2, 3, and 4 accordingly. Be careful to retain the POSTARGs so that you get your 2x2 mozaic. You may need to cut and paste the X and Y POSTARGs from Visits 2, 3, and 4 that were defined by the mosaic template. You can verify the layout using Aladin's view. 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 FSR1758 WFC3/UVI ACCUM UVIS-CENT F300X FLASH=10 1 353 S POS TARG S ER (1059 S) 73.55487747622576, 79.379823084808; PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 FSR1758 WFC3/UVI ACCUM UVIS-CENT F606W 1 403 S (806 POS TARG S ER S) 73.55487747622576, 79.379823084808; PATTERN 2 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 FSR1758 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=8 1 237 S (237 POS TARG S ER S) 73.55487747622576, 79.379823084808 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 1 none none none 1 N/A S TER FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 2 none none none 1 N/A S TER FSR1758 1 WFC3/UVI ACCUM UVIS-CEN F300X 3 none none none 1 N/A S TER FSR1758 2 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER FSR1758 2 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER 16068( 4) - 01-Apr-2021 10:11:42 - [ 11] 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 | ------------------------------------------------------------------------------------------------------------------------------------ FSR1758 3 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER 16068( 4) - 01-Apr-2021 10:11:42 - [ 12] Summary Form for Proposal 16068 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, FLASH=8 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-APR-2021:00:00:00 AND 01-NOV-2021:00:00:00, PATTERN 1 1, PATTERN 2 2, POS TARG -73.55487747622576, -79.379823084808, POS TARG -73.55487747622576, 69.09290691519202, POS TARG 73.55487747622576, -69.09290691519202, POS TARG 73.55487747622576, 79.379823084808, SAME ORIENT AS 05 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F300X, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names FSR1758 ------------------------------------------------------------------------------------------------------------------------------------