14183( 4) - 26-Aug-2015 20:46:34 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14183 Version: 4 Check-in Time: 26-Aug-2015 20:46:34 STScI Edit Number: 0 Title The intermediate-age cluster GLIMPSE-C01 ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Blagoy Rangelov George Washington University Y CoI: Dr. Oleg Y. Kargaltsev George Washington University N CoI: Dr. George G. Pavlov The Pennsylvania State University N ------------------------------------------------------------------------------------ Abstract We propose multi-band HST observations of the most massive intermediate-age star cluster in the Galaxy GLIMPSE-C01. Considering the cluster's age, an unusually large number of X-ray sources has been detected in a previous Chandra program. In addition, extended X-ray emission was detected around GLIMPSE-C01 to spatially coincide with IR emission, indicating an ongoing interaction between the cluster and its environment. There is little information about the X-ray source population in intermediate age clusters. We will investigate the X-ray source population in GLIMPSE-C01 using our multiwavelength classification method to determine the nature of the X-ray sources in the cluster. This will enable us to study the X-ray binary evolution and history of the sources in GLIMPSE-C01. We request only one HST orbit to achieve this goal. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose 1 HST orbit to study GLIMPSE-C01 - massive intermediate-age star cluster with half-light radius of 36". We will use the high dynamic range of WFC3/IR to study both the brightest as well as the faintest stars in GLIMPSE-C01. We will use both WFC3/UVIS and WFC3/IR to observe in four filters covering the range from 850 to 1600 Angstrom. All 3 exposures with WFC3/IR will use WFC3-IR-DITHER-LINE dither pattern with the pointing on the geometric center of the detector (Apeture = IR-FIX). The F127M exposure will be executed in mode NSAMP=15, SAM-SEQ=STEP25 for total of 548.47 s (2x 274.235 s). The other two IR exposures, F139M and F153M, will be executed in mode NSAMP=11, SAM-SEQ=STEP50 for total of 595.465 s (2x 299.232 s). The WFC3/UVIS exposure will use WFC3-UVIS-DITHER-LINE dither pattern. The two sub-exposures are split into 190 s and 350 s. We do not use CR-SPLITs to avoid the loss of observation time due to buffer dump. The Aperture will be set to UVIS1-FIX so that the star cluster falls on the geometric center of CCD1 and therefore the chip gap is avoided to prevent the loss of any significant to the program objects of falling onto the gap. The choice of dither patterns and the read sequences (for the IR detector) is dictated by the tradeoff between minimizing time loss due to the data dumps and reading the detector as fast as possible while constraining everything to be within a single orbit. ------------------------------------------------------------------------------------ 14183( 4) - 26-Aug-2015 20:46:34 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GLIMPSE-C01 STELLAR CLUSTER, RA=18H48M49.7000S, J2000 V = 21 +/- 1 GLOBULAR CLUSTER DEC=-01D29'50.00" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 14183( 4) - 26-Aug-2015 20:46:34 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 1.2 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-IR-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.636 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 14183( 4) - 26-Aug-2015 20:46:34 - [ 4] Visit: 01 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GLIMPSE-C01 WFC3/IR MULTIAC IR-FIX F127M NSAMP=15, SAMP-SEQ=STEP25 1 DEF PATTERN 2 1 CUM (548.47 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GLIMPSE-C01 WFC3/IR MULTIAC IR-FIX F139M NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 2 2 CUM (598.465 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GLIMPSE-C01 WFC3/IR MULTIAC IR-FIX F153M NSAMP=11, SAMP-SEQ=STEP50 1 DEF PATTERN 2 3 CUM (598.465 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GLIMPSE-C01 WFC3/UVI ACCUM UVIS1-FIX F814W CR-SPLIT=NO, FLASH=8 1 540 S POS TARG 0, S see below -16.27545972231495; (540 S) PATTERN 1 4 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GLIMPSE-C01 1 WFC3/IR MULTIAC IR-FIX F127M 1 none none none 1 N/A CUM GLIMPSE-C01 1 WFC3/IR MULTIAC IR-FIX F127M 2 none none none 1 N/A CUM GLIMPSE-C01 2 WFC3/IR MULTIAC IR-FIX F139M 1 none none none 1 N/A CUM GLIMPSE-C01 2 WFC3/IR MULTIAC IR-FIX F139M 2 none none none 1 N/A CUM GLIMPSE-C01 3 WFC3/IR MULTIAC IR-FIX F153M 1 none none none 1 N/A CUM GLIMPSE-C01 3 WFC3/IR MULTIAC IR-FIX F153M 2 none none none 1 N/A CUM GLIMPSE-C01 4 WFC3/UVI ACCUM UVIS1-FI F814W 1 none none none 1 190 S S X GLIMPSE-C01 4 WFC3/UVI ACCUM UVIS1-FI F814W 2 none none none 1 350 S S X 14183( 4) - 26-Aug-2015 20:46:34 - [ 5] Summary Form for Proposal 14183 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, UVIS1-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, FLASH=8, NSAMP=11, NSAMP=15, SAMP-SEQ=STEP25, SAMP-SEQ=STEP50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 4, PATTERN 2 1, PATTERN 2 2, PATTERN 2 3, POS TARG 0, -16.27545972231495 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F127M, F139M, F153M, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GLIMPSE-C01 ------------------------------------------------------------------------------------------------------------------------------------