10765( 2) - 10/12/05 13:20 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10765 Version: 2 Check-in Time: 12-Oct-2005 17:20:06 Title The Discrete X-ray Source Population in NGC~5253, our nearest post-starburst ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 14 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Andreas Zezas Smithsonian Institution Astrophysical Observatory CoI: Dr. Vicky Kalogera Northwestern University N CoI: Prof. John S. Gallagher III University of Wisconsin - Madison N CoI: Dr. Giuseppina Fabbiano Smithsonian Institution Astrophysical N Observatory CoI: Dr. Daniela Calzetti Space Telescope Science Institute N CoI: Dr. Andrea H. Prestwich Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract We propose a 140ksec ACIS-S and HST-ACS observations of NGC5253, our nearest post- starburst galaxy. This observation, together with archival data, will yield a sensitivity limit of 5x10^35 erg\s allowing us to detect for the first time in an evolved star-burst galaxy, the vast majority of active HMXBs. Our major goal is to compare the various X-ray source populations (distinguished from their X-ray and optical properties) and associate them with the evolutionary stage of the starburst. By combining these data with observations of other nearby star-forming galaxies which with NGC~5253 form a starburst age sequence, we will investigate the variations of the XRB populations (and their XLF) as a function of the starburst age. This way we will test XRB population synthesis models. ------------------------------------------------------------------------------------ 10765( 2) - 10/12/05 13:20 - [ 2] Observations Description ------------------------ We will observe NGC5253 in three filters (F435W, F555W, F814W) with exposures of 880sec, 1200sec and 1150sec respectively. We use a 2-point dither patern in order to remove cosmic rays and obtain some exposure over the chip gap. We observe two fields offset from the galaxy nucleus in order to cover the whole galaxy. The two fields overlap in the central part of the galaxy to provide deeper coverage. Each exposure has been adjusted in order for the observations to fit in the three orbits. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10765( 2) - 10/12/05 13:20 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5253- GALAXY, STARBURST, RA=13H39M59.0000S +/- 0.1", J2000 V = 10.99 FIELD1 MAGELLANIC IRREGULAR DEC=-31D37'40.50" +/- 0.1" Coordinate Source: GSC_SURVEY_PLATE 2 NGC5253- GALAXY, STARBURST, RA=13H39M52.0000S +/- 0.1", J2000 V = 10.99 FIELD2 MAGELLANIC IRREGULAR DEC=-31D39'8.00" +/- 0.1" Coordinate Source: GSC_SURVEY_PLATE 10765( 2) - 10/12/05 13:20 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 10765( 2) - 10/12/05 13:20 - [ 5] Visit: 01 Visit Priority: 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5253-FIE ACS/WFC ACCUM WFCENTER F555W CR-SPLIT=NO 1 600 S PATTERN 1 1-3 LD1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5253-FIE ACS/WFC ACCUM WFCENTER F435W CR-SPLIT=NO 1 360 S LD1 see below ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5253-FIE ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO 1 500 S LD1 see below ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC5253-FIE ACS/WFC ACCUM WFCENTER F555W CR-SPLIT=NO 1 600 S PATTERN 1 4-6 LD2 see below ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC5253-FIE ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO 1 500 S LD2 see below ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC5253-FIE ACS/WFC ACCUM WFCENTER F435W CR-SPLIT=NO 1 360 S LD2 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC5253-FIELD1 1 ACS/WFC ACCUM WFCENTER F555W 1 none none none 1 N/A NGC5253-FIELD1 1 ACS/WFC ACCUM WFCENTER F555W 2 none none none 1 N/A NGC5253-FIELD1 2 ACS/WFC ACCUM WFCENTER F435W 1 none none none 1 N/A NGC5253-FIELD1 2 ACS/WFC ACCUM WFCENTER F435W 2 none none none 2 520.0 S NGC5253-FIELD1 3 ACS/WFC ACCUM WFCENTER F814W 1 none none none 1 585.0 S NGC5253-FIELD1 3 ACS/WFC ACCUM WFCENTER F814W 2 none none none 2 575.0 S NGC5253-FIELD2 4 ACS/WFC ACCUM WFCENTER F555W 1 none none none 2 600.0 S NGC5253-FIELD2 4 ACS/WFC ACCUM WFCENTER F555W 2 none none none 3 600.0 S NGC5253-FIELD2 5 ACS/WFC ACCUM WFCENTER F814W 1 none none none 2 460.0 S NGC5253-FIELD2 5 ACS/WFC ACCUM WFCENTER F814W 2 none none none 3 740.0 S NGC5253-FIELD2 6 ACS/WFC ACCUM WFCENTER F435W 1 none none none 3 N/A NGC5253-FIELD2 6 ACS/WFC ACCUM WFCENTER F435W 2 none none none 3 519.0 S 10765( 2) - 10/12/05 13:20 - [ 6] Summary Form for Proposal 10765 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1-3 PATTERN 1 4-6 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F435W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC5253-FIELD1 NGC5253-FIELD2 ------------------------------------------------------------------------------------------------------------------------------------