15615( 3) - 14-Dec-2018 19:43:32 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15615 Version: 3 Check-in Time: 14-Dec-2018 19:43:32 STScI Edit Number: 0 Title Using Star Formation in NGC 2276 as an X-ray Binary Chronometer ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Paul H Sell University of Crete Y CoI: Dr. K Anastasopoulou University of Crete N CoI: Dr. Andreas Zezas Smithsonian Institution Astrophysical N Observatory CoI: Dr. Ewan O'Sullivan Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract We propose joint Chandra/HST observations (Chandra: 150 ks) of NGC 2276 to obtain a complete picture of its luminous high-mass X-ray binary (HMXB) population. Interaction of NGC 2276 with the intergalac- tic medium has ignited a recent, asymmetric burst of star formation. There is tantalizing evidence in existing observations that this asymmetry is also seen in the luminosity distributions of HMXBs. Because the star formation rate and metallicity are similar across the galaxy, this galaxy provides a unique envi- ronment to test differences in the HMXB populations with age. This way we will directly test population synthesis models that predict specific timescales for the formation rate of HMXBs in different ages. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of this program is to study the age distribution of bright X-ray binaries by matching them to their nearby host star clusters. We will measure the ages of star clusters using SED fitting of five WFC3-UVIS bands, one orbit each: F275W, F336W, F438W, F555W, and F814W. We image the entire galaxy in one pointing per filter regardless of the roll angle, though we use a standard 4-point dither pattern to fill in chip gaps, subsample the PSF, reject cosmic rays and bad columns, etc. The APT gives a low background warning (for mitigating CTE losses) for our UV filters: F275W, F336W, F438W. Using a previous HST observation, we have determined that the NGC2276 galactic background in our regions of interest will be at least double that in the blank sky background. Accordingly, we have added post-flash to our F275W and F336W observations but do not need post-flash for our F438W observations. In summary when taking into account overheads and visibility, this results in 718 seconds per exposure for F814W, F555W, and F438W and 714 seconds per exposure for F336W and F275W. ------------------------------------------------------------------------------------ 15615( 3) - 14-Dec-2018 19:43:32 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC2276 GALAXY, ACCRETION DISK, RA=07H27M33.4000S, J2000 V = 11.3 SPIRAL, STAR FORMING DEC=+85D45'29.50" REGION, STARBURST Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. The center of the field was adjusted in order to ensure full coverage of the galaxy regardless of roll angle. ------------------------------------------------------------------------------------------------------------------------------------ 15615( 3) - 14-Dec-2018 19:43:32 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-MOS-DITH-LINE WFC3-UVIS-MOS-DITH-LINE Pattern_Purpose MOSAIC DITHER Number_Of_Points 2 2 Point_Spacing 2.4 0.119 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.754 33.606 Angle_Between_Sides Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ 15615( 3) - 14-Dec-2018 19:43:32 - [ 4] Visit: 01 (NGC2276-F814W) 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 NGC2276 WFC3/UVI ACCUM UVIS-CENT F814W 1 703 S PATTERN 1 1 S ER (2812 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F814W 1 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F814W 1 2 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F814W 2 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F814W 2 2 none none 1 N/A S TER 15615( 3) - 14-Dec-2018 19:43:32 - [ 5] Visit: 02 (NGC2276-F555W) 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 NGC2276 WFC3/UVI ACCUM UVIS-CENT F555W 1 703 S PATTERN 1 1 S ER (2812 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F555W 1 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F555W 1 2 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F555W 2 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F555W 2 2 none none 1 N/A S TER 15615( 3) - 14-Dec-2018 19:43:32 - [ 6] Visit: 03 (NGC2276-F438W) 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 NGC2276 WFC3/UVI ACCUM UVIS-CENT F438W 1 703 S PATTERN 1 1 S ER (2812 S) Comments: The regions of the target galaxy background will have >=12 e-/pix in this filter. No post-flash is needed. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F438W 1 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F438W 1 2 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F438W 2 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F438W 2 2 none none 1 N/A S TER 15615( 3) - 14-Dec-2018 19:43:32 - [ 7] Visit: 04 (NGC2276-F336W) 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 NGC2276 WFC3/UVI ACCUM UVIS-CENT F336W FLASH=8 1 699 S PATTERN 1 1 S ER (2796 S) Comments: A post-flash has been added so that the regions of interest on the galaxy will have >=12 e-/pix. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F336W 1 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F336W 1 2 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F336W 2 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F336W 2 2 none none 1 N/A S TER 15615( 3) - 14-Dec-2018 19:43:32 - [ 8] Visit: 05 (NGC2276-F275W) 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 NGC2276 WFC3/UVI ACCUM UVIS-CENT F275W FLASH=9 1 699 S PATTERN 1 1 S ER (2796 S) Comments: A post-flash has been added so that the regions of interest on the galaxy will have >=12 e-/pix. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F275W 1 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F275W 1 2 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F275W 2 1 none none 1 N/A S TER NGC2276 1 WFC3/UVI ACCUM UVIS-CEN F275W 2 2 none none 1 N/A S TER 15615( 3) - 14-Dec-2018 19:43:32 - [ 9] Summary Form for Proposal 15615 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=8, FLASH=9 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F275W, F336W, F438W, F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC2276 ------------------------------------------------------------------------------------------------------------------------------------