----- Attempting Submission 2 (Thu Nov 20 19:52:58 GMT 2008) ----- Ultra Luminous X-ray sources (ULX) have luminosities many times the Eddington limit for a stellar black hole and are associated with massive star formation. This is illustrated by the Chandra image of the Cartwheel, a collisional ring galaxy. The bulk of the X-ray luminosity is produced by 16 ULX co-incident with the outer ring of star formation. We request Chandra and HST time to image another collisional ring galaxy NGC 922. NGC 922 is similar to the Cartwheel, except that it is nearly three times closer and has higher metallicity. We will (1) detect fainter sources than was possible for the Cartwheel, (2) use archival HST data and our new Halpha images to associate X-ray sources with tracers of star formation and (3) study the effect of metallicity on the formation of ULX.

This proposal involves H-alpha line and continuum imaging of the nearby collisional ring galaxy NGC 922. The F665N filter is used to image the redshifted H-alpha line and the F621 filter used to image the continuum. We requre at least 5000s in the line filter and 1500s in the continuum. One of our science goals is to determine the positions of bright X-ray sources relative to the H-alpha ring. We therefore opt to use the UVIS-CENTER aperture and a LINE dither to fill in the chip gaps (as well as eliminate hot pixels and cosmic ray hits). 12 false 0.0 0.0 false false false false false SUPPORTED GALAXY INTERACTING GALAXY RING SPIRAL STARBURST This object was generated by the targetselector and retrieved from the NED database. J2000 00 00 0.0000 +00 00 0.00 J2000 POS-TARG DITHER DITHER 2 2.0 WFC3-UVIS-DITHER-LINE false false 0.145 2 46.84 POS-TARG LINE 46.84 1 true The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /private/tmp/OPVisit34011.xml 1227206393321 (Tic-Visit :proposal-id 11836 :visit-id "01" :proposal-version -1 :trans-version "20080807" :date "20-Nov-2008 13:39:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2309952 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11836 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11836 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2925 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11836 :visit-id "01" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3063 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11836 :visit-id "01" :orbit-number 3 :pcs-time 195 :si-vis-utilization 3063 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) true 3 0