0 Assigned ID: 651 ----- Attempting Submission 1 (Wed Jan 30 10:56:23 GMT 2019) ----- HST Phase I Proposal 651 (LymanArcs_MidCycle.apt) successfully submitted. Receipt: # 651-1 ----- Attempting Submission 2 (Wed Jan 30 15:31:14 GMT 2019) ----- HST Phase I Proposal 651 (LymanArcs_MidCycle.apt) successfully submitted. Receipt: # 651-2 ----- Attempting Submission 3 (Wed Jan 30 17:46:56 GMT 2019) ----- Resubmission for reobservation of failed visit 03. Visit 63 has minor changes: Larger ~2" dither point spacing, and a different POS TARG shift 306740944 ----- Attempting Submission 1 (Mon Mar 25 13:20:59 GMT 2019) ----- HST Phase II Proposal 15696 (phase2.apt) successfully submitted. Receipt: # 15696-1 ----- Attempting Submission 2 (Fri Mar 29 16:48:05 GMT 2019) ----- HST Phase II Proposal 15696 (phase2.apt) successfully submitted. Receipt: # 15696-2 ----- Attempting Submission 3 (Tue Apr 09 18:12:15 GMT 2019) ----- ----- Attempting Submission 4 (Sun May 12 15:23:54 GMT 2019) ----- Constraints on the physical origins of Lyman-alpha halos at z>4 from giant gravitational arcs Recent deep integral-field spectroscopy observations using VLT/MUSE revealed two high-redshift (z>4) lensed arcs in the galaxy cluster MACS0940. Notably, both lensed galaxies show highly extended Lyman-alpha emission (> 5 arcsec). These are very rare sources indeed, with only three other such systems known to date. However, truly exceptional is the fact that one of these galaxies forms an almost complete Einstein ring, with the Lyman-alpha arc reaching an unrivaled extent of 30 arcsec. Moreover, the MUSE spectroscopy of this object has identified distinct large-scale spatial variations in the Lyman-alpha line profile. While this object is very unusual from an observational perspective, it shares many intrinsic properties with other, typical, unlensed Lyman-alpha emitters, thus providing an unbiased testbed for distinguishing the different scenarios that have been proposed to explain the origin of Lyman-alpha halos: (a) scattering of the Lyman-alpha emission by neutral gas, (b) cold streams feeding the circumgalactic medium (CGM) and shining in Lyman alpha, and/or (c) the presence of satellite galaxies surrounding the main source of emission. Using multi-band HST photometry in the rest-frame UV, we will map the star-formation activity in both Lyman-alpha arcs. By correlating the results with the Lyman-alpha properties observed with MUSE, and leveraging the magnification boost from the galaxy cluster, we will be able to empirically test the different scenarios. Observations of galaxy cluster MACS0940 in three filter bands. F814W (3 orbits), F125W (1 orbit) and F160W (1 orbit). Pointing chosen to cover MUSE 1'x1' FoV within a single WFC chip Roll angle constraints for F814W are required to avoid bright star. Each orbit contains 2 exposures with a small dither. Cosmology Galaxies and the IGM 3 false false false false false false false SUPPORTED CLUSTER OF GALAXIES EINSTEIN RING GRAVITATIONAL LENS J2000 J2000 Primary target (System 1 arc): V-Magnitude = 22.27 +/- 0.1 CLUSTER OF GALAXIES EINSTEIN RING GRAVITATIONAL LENS J2000 J2000 Primary target (System 1 arc): V-Magnitude = 22.27 +/- 0.1 ACS/WFC Imaging No No F814W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W POS-TARG DITHER DITHER 2 3.034 ACS-WFC-DITHER-LINE false false 0.149 3 85.29 POS-TARG ACS-WFC-DITHER-LINE 34.25 3 true POS-TARG DITHER 0.636 LINE false false 2 41.788 WFC3-IR-DITHER-LINE 2 false POS-TARG DITHER 2.088 LINE false false 2 41.788 WFC3-IR-DITHER-LINE 4 false The scheduling data was generated by CASM 27.0. CASM was run in Phase II mode. 1558165253000 111.67883535340388 (Tic-Visit :proposal-id 15696 :visit-id "01" :proposal-version -1 :trans-version "20181130" :date "12-May-2019 17:18:46.0" :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 1705344 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15696 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15696 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2812 :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 3145 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15696 :visit-id "01" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2842 :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 3145 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15696 :visit-id "01" :orbit-number 3 :pcs-time 302 :si-vis-utilization 2842 :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 3145 :pcs-gap 0 ) true 3 0 The scheduling data was generated by CASM 27.0. CASM was run in Phase II mode. 1556712367000 125.15974176811602 (Tic-Visit :proposal-id 15696 :visit-id "02" :proposal-version -1 :trans-version "20181130" :date "12-May-2019 17:18:47.0" :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 522256 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15696 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15696 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2710 :al-overhead-at-end 0 :internal-dur-at-end 652 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3145 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 27.0. CASM was run in Phase II mode. 1556742426000 125.15956008010488 (Tic-Visit :proposal-id 15696 :visit-id "03" :proposal-version -1 :trans-version "20181130" :date "12-May-2019 17:18:34.0" :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 522256 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15696 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15696 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2710 :al-overhead-at-end 0 :internal-dur-at-end 652 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3145 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 27.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15696 :visit-id "63" :proposal-version -1 :trans-version "20181130" :date "12-May-2019 17:14:00.0" :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 522256 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15696 :visit-id "63" :obset-id "63" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15696 :visit-id "63" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2712 :al-overhead-at-end 0 :internal-dur-at-end 652 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3145 :pcs-gap 0 ) false 1 0