----- Submission 1 (Fri Oct 07 22:59:02 GMT 2005) ----- Assigned ID: 1024 ----- Submission 1 (Thu Aug 25 22:43:57 GMT 2005) ----- Phase I Proposal 1024 (HST_observations) successfully submitted. This is a phase I submission for HST observations awarded through Chandra Cycle-7 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.

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. GALAXIES 12 false 0.0 false false false false false SUPPORTED GALAXY STARBURST MAGELLANIC IRREGULAR J2000 00 00 0.0000 +00 00 0.00 J2000 GALAXY STARBURST MAGELLANIC IRREGULAR J2000 00 00 0.0000 +00 00 0.00 J2000 POS-TARG DITHER 3.011 LINE false false 2 85.28 ACS-WFC-DITHER-LINE 1 false /tmp/OPVisit23356.xml 1128725628426 (Tic-Visit :proposal-id 10765 :visit-id "01" :proposal-version -1 :trans-version "20050323" :date "07-Oct-2005 18:53:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 3410688 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10765 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10765 :visit-id "01" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2904 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3283 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10765 :visit-id "01" :orbit-number 2 :pcs-time 367 :si-vis-utilization 2913 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3283 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10765 :visit-id "01" :orbit-number 3 :pcs-time 367 :si-vis-utilization 2916 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3283 :pcs-gap 0 ) true 3 0 /tmp/OPVisit50093.xml 1128547131837