Set FLASH = 12 for F336W exposures. -1523700576 ----- Attempting Submission 1 (Sat Oct 11 21:25:27 GMT 2014) ----- ----- Attempting Submission 2 (Mon Jan 05 19:57:46 GMT 2015) ----- ----- Attempting Submission 3 (Tue Jan 06 17:25:36 GMT 2015) ----- X-rays may have contributed to the heating and reionization of the IGM in the early universe. High mass X-ray binaries (HMXB) within small, low-metallicity galaxies are expected to be the main source of X-rays at this time. Since studying these high-redshift galaxies is currently impossible, we turn to local analogs that have the same properties the galaxies in the early are expected to have. A number of recent studies have shown an enhanced number of HMXBs in nearby low metallicity galaxies. We propose to observe a sample of metal-deficient luminous compact galaxies (LCG) in order to determine if the X-ray luminosity is enhanced relative to SFR, thereby providing further evidence to the importance of X-rays in the early universe. We will obtain images in the F606W and F336W filters with the WFC3/UVIS. We will obtain three observations in each filter for cosmic ray and bad pixel rejection. We will obtain a total integration of 1080s in each filter. The F606W filter image will achieve a limiting V-magntiude of 25.9 at a signal to noise ratio of 5. At the distance to the galaxies of about 120 Mpc, this will permit detection of super star clusters with M_V < -9.5 (allowing for an extinction E(B-V) = 0.055 as measured for target #1, E(B-V) = 0.037 for target #2). The F336W filter image will enable us to construct a U-V color-magnitude diagram and constrain the ages of the star cluster via comparison with stellar synthesis models (e.g. Hunter et al.\ 2000, AJ, 120, 2383). We select F336W because of the young age expected for the stars in the clusters. The clusters detected in the F606W image with S/N = 5 will be detected in the F336W image at S/N = 3.7, allowing reasonable constraints on the U-band magnitudes of the dimmer clusters ($\Delta U = \pm 0.3$) and accurate measurements for the brightest clusters. Default false false false false false SUPPORTED GALAXY DWARF COMPACT STAR FORMING REGION STARBURST SHOC486 J2000 GALAXY DWARF COMPACT STAR FORMING REGION STARBURST J2000 POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 1 false 1420564400396 /tmp/OPVisit5120919047896385300.xml The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13940 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "06-Jan-2015 11:13:19.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732496 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13940 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13940 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2849 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0 1420564639946 /tmp/OPVisit5068824783921575239.xml The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13940 :visit-id "02" :proposal-version -1 :trans-version "20140605" :date "06-Jan-2015 11:17:18.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732496 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13940 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13940 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2849 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3226 :pcs-gap 0 ) true 1 0