0 Assigned ID: 1211 ----- Attempting Submission 1 (Fri Oct 02 01:14:36 GMT 2015) ----- SAME POS MAY NOT BE APPROPRIATE SAME POS MAY NOT BE APPROPRIATE POS TARG & PATTERN should be used carefully with ACS ramp or WFC3 quad filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp or WFC3 quad filters as central wavelengths & transmission efficiencies vary within the apertures. The changes in filters with respect to Phase I have been approved by Contact Scientist. 1767735027 ----- Attempting Submission 1 (Sat Dec 12 01:28:35 GMT 2015) ----- A warning about POS-TARG is issued at the moment of submission. We have checked all the offsets and settings, and believe they are compatible with the instrument requirements. Lyman Alpha halo in a confirmed Lyman Continuum leaker The Lyman-alpha (Lya) line is a tool of prime cosmological importance, bright enough to detect galaxies out to extreme redshifts. Spatially resolved studies both at low and high redshift have shown that much of the Lya emission often comes from a diffuse "halo" component extending beyond several galactic radii. The origin of the halos is currently being debated: scattering of Lya radiation produced in star-forming regions, or in situ production of Lya photons. We predict that if the Lya halos are due to scattering of Lya radiation from star-forming regions, then the halos should be missing or weak in galaxies which are transparent to their ionizing Lyman continuum. We have obtained HST time in Cycle 23 to test this hypothesis. At the time of proposal submission, no suitable targets with confirmed Lyman continuum escape were known, we therefore based our classification on their Lya properties. Since then, we have detected Lyman continuum escaping from a compact, star-forming, Green Pea galaxy J0925+1403. In the present proposal, we will image the galaxy in Lya, far-UV continuum, and optical filters in order to probe the extent and radial profile of the Lya halo emission as compared to the other filters. This study will provide a direct test to our predictions, and will complement results of our regular Cycle 23 program GO 14131. This program will image the compact dwarf galaxies J0925+1403 with two ACS/SBC filters to synthesize a Lya bandpass (F150LP and F165LP - 3 orbits), two WFC3/UVIS filters (F475W and F547M - 1 orbit), ACS/WFC F850LP and ACS ramp filter FR853N (1 orbit). This amounts to 5 orbits, organized into 4 visits. The SBC visits should be scheduled so that the SBC HAS NOT BEEN IN USE FOR THE PAST 24 hours to minimize the dark current. We have split the SBC observations into 2 visits to prevent heatup of the detector. The WFC3/UVIS visit utilises a 3 point dither to step over droplets. ACS/WFC is used for ramp filter imaging and F850LP, utilising SMALL pos-targs. Health/safety flag has been raised by the Bright Object Tool (BOT) at ACS/SBC F150LP for a star present in the field of view. It is due to a star at RA=09 25 32.7, DEC=+14 02 40.7 of V=15mag and unknown FUV magnitude. However, its NUV = 20.5 mag, and no warning is issued by the GALEX catalogue. This is proven by the ETC calculation, even if we assume an O5V stellar type (ACS.im.756629). All the other targets present in the field are safe, including the observed galaxy. The same star issues a warning at WFC3 filters to possibly cause a degradation of the science. However, the angular distance between this source and our science target is large (>30"), and the target is compact (1"), therefore we expect no impact. The galaxy that we target is compact (1 arcsec). Our ETC calculations show that the observations are feasible in all the filters, and we attain limiting fluxes appropriate for our scientific goals (for ACS/SBC filters: ACS.im.756748, ACS.im.756749). Central parts of the galaxy are two magnitudes brighter, but will not result in detector saturation. Post-flash values for WFC3/UVIS and ACS/WFC were determined using ETC and were adjusted so as to avoid APT warnings. ISM IN EXTERNAL GALAXIES 3 false false false false SUPPORTED GALAXY DWARF COMPACT STARBURST YES J2000 J2000 FUV=20.71+/-0.05, NUV=20.75+/-0.04 ACS/SBC Imaging No No F150LP ACS/SBC Imaging No No F165LP WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F625W WFC3/UVIS Imaging No No F850LP ACS/WFC RampFilter No No FR853N ACS/WFC RampFilter No No FR656N /private/var/folders/ny/y2rfgxpn4k37g754z2ph3gd00001bc/T/OPVisit1106813305550319893.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. We request that the SBC not be used 24 hours before this visit in order to mitigate the effects of dark current. The SBC observations are split in two visits to prevent heatup (and associated increase in dark current) of detector. 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CASM was run in Phase II mode. We request that the SBC not be used 24 hours before this visit in order to mitigate the effects of dark current. The SBC observations are split in two visits to prevent heatup (and associated increase in dark current) of detector. 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(Tic-Visit :proposal-id 14466 :visit-id "03" :proposal-version -1 :trans-version "20150609" :date "14-Dec-2015 11:00:11.0" :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 106960 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14466 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14466 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2885 :al-overhead-at-end 79 :internal-dur-at-end 153 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3218 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. /private/var/folders/ny/y2rfgxpn4k37g754z2ph3gd00001bc/T/OPVisit7416344591066109524.xml (Tic-Visit :proposal-id 14466 :visit-id "04" :proposal-version -1 :trans-version "20150609" :date "14-Dec-2015 10:58:09.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1421120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14466 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14466 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2885 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3218 :pcs-gap 0 ) true 1 0