Science Keywords: Select from 2 to 5 items. Science Keywords is a required field. 0 Assigned ID: 1108 ----- Attempting Submission 1 (Thu May 28 16:42:46 GMT 2020) ----- Joint NRAO/HST Proposal loading New HST user here, I definitely appreciate a set of expert eyes on this setup! 674205851 ----- Attempting Submission 1 (Fri Jun 26 18:06:01 GMT 2020) ----- We have discovered spectacular vast molecular gas reservoirs extending tens of kpc outside of two high-redshift post-starburst galaxies as part of an ongoing ALMA CO survey of such objects. While the host galaxies are only 3-5kpc in size, nearly half the total CO luminosity in each system extends 25-45kpc from the hosts. This discovery was unexpected and both the scale and magnitude of the extended gas features are unprecedented at any redshift. The origin of the vast CO is unclear, but may be related to AGN outflows, tidal stripping, and/or environmental effects. We propose a low-cost, high-impact VLA+HST campaign to determine the origins of the remarkable gas features and their broader implications for galaxy evolution, including galactic feedback, the formation of extended stellar halos, and metal enrichment of the circumgalactic medium. The VLA data are designed to characterize the presence and effects of AGN - existing data cannot even rule out radio-loud AGN activity - while the HST data are needed to discover stellar tidal debris and/or close merging companions. Together these datasets can uniquely determine the origin of the incredible molecular gas features we have found and place this unexpected discovery in broader context. This observing program will acquire 1-orbit depth WFC3-IR / F110W imaging of two z~0.6 post-starburst galaxies. The goal is to spatially resolve the galaxies themselves and search for tidal stellar streams, nearby companions, and other faint / low surface brightness emission. We will observe in four dither positions using the WFC3-IR-DITHER-BOX pattern in order to properly sample the PSF. We use a slighly larger dither pattern than the default, corresponding to pixel positions of (0,0), (10.0,3.5), (6.5,10.0), and (-3.5,6.5), because some bad pixels come in clumps. We do not attempt to dither over the IR blobs or the death star dead spot. To maximize our dynamic range, we will use STEP50 with NSAMP=15 at each dither position. We use a second exposure at a single dither position with NSAMP=14 to fill out the orbit. not required Galaxies 6 false false false false false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY INTERACTING GALAXY TIDAL TAIL J2000 J2000 GALAXY HIGH REDSHIFT GALAXY INTERACTING GALAXY TIDAL TAIL J2000 J2000 WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F110W POS-TARG DITHER 1.42 LINE 0.919 false false 76.301 4 17.370 WFC3-IR-DITHER-BOX-MIN 2 false 1593185695564 /private/var/folders/52/vbdzw9k52wq88x3d8zhdmdz40000gn/T/OPVisit2484331588528512960.xml The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 16201 :visit-id "01" :proposal-version -1 :trans-version "20200518" :date "26-Jun-2020 10:34:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1375296 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16201 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16201 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2737 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) true 1 0 1593185618511 /private/var/folders/52/vbdzw9k52wq88x3d8zhdmdz40000gn/T/OPVisit752715269605839985.xml The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 16201 :visit-id "02" :proposal-version -1 :trans-version "20200518" :date "26-Jun-2020 10:33:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1375296 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16201 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16201 :visit-id "02" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2737 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3157 :pcs-gap 0 ) true 1 0