Unsupported characters were found in Abstract and replaced with |*| Scientific Category is a required field. Science Keywords: Select from 2 to 5 items. US Admin CoI is a required field. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. 0 Assigned ID: 1313 ----- Attempting Submission 1 (Tue Dec 29 14:43:19 GMT 2020) ----- joint Be very careful mixing POS TARG and Center_Pattern = Yes Be very careful mixing POS TARG and Center_Pattern = Yes Be very careful mixing POS TARG and Center_Pattern = Yes Be very careful mixing POS TARG and Center_Pattern = Yes Latest submission comments: Swapped the F606W and F814W exposures in visits 01, 02, 03, 04 to minimize Earthshine in the F606W exposures. Previous submission comments: Broke up the previous visit 01 into the new visits 01 and 12 in order to increase scheduling flexibility given SAA-caused limited availability of full CVZ opportunities. Broke the previous visits 02, 03, 04 up into the new visits 02, 03, 04 and 09, 10, 11 in order to increase scheduling flexibility given SAA-caused limited availability of full CVZ opportunities. Adjusted the ORIENT range for visit 08 to the range approved in Change Request 91937. Slightly shifted the target coordinates to optimally center the mosaic. 724919583 ----- Attempting Submission 1 (Wed Jan 20 20:32:15 GMT 2021) ----- HST Phase II Proposal 16488 successfully submitted. Receipt: # 16488-1 ----- Attempting Submission 2 (Tue Jan 26 11:31:02 GMT 2021) ----- HST Phase II Proposal 16488 successfully submitted. Receipt: # 16488-2 ----- Attempting Submission 3 (Thu Jan 28 14:33:37 GMT 2021) ----- ----- Attempting Submission 4 (Fri Mar 12 16:55:57 GMT 2021) ----- HST Phase II Proposal 16488 successfully submitted. Receipt: # 16488-4 ----- Attempting Submission 5 (Mon Mar 15 14:03:38 GMT 2021) ----- HST Phase II Proposal 16488 successfully submitted. Receipt: # 16488-5 ----- Attempting Submission 6 (Wed Mar 17 14:57:39 GMT 2021) ----- We use POS TARG to define the mosaic relative to the center. An XMM-Newton+HST study of an extreme, high-redshift cluster merger We propose XMM-Newton+HST observations of SPT-CLJ2228-5828, a high-redshift (z = 0.73) candidate for a dissociative galaxy cluster merger. It exhibits two major, widely-separated (940 kpc) centers in the galaxy distribution with (noisy) counterparts identified in an initial weak lensing analysis of the cluster. Traced by the SPT Sunyaev Zel'dovich signature, the hot intracluster plasma appears to be located in the middle between the two peaks of the galaxy distribution and mass map, suggesting a violent, dissociative merger. If confirmed, SPT-CLJ2228-5828 would be among the widest dissociated mergers known. These systems are extremely rare, especially at high redshifts, and provide the best conditions for constraints on the dark matter self-interaction cross-section. The requested high-resolution X-ray observations will enable us to to efficiently confirm the dissociated merger nature. Additionally, they will allow us to constrain the cluster X-ray temperature and luminosity to 10%, providing the precision needed to compare its properties to its peers among the rarest violent cluster mergers known. We also request complementary HST observations to substantially improve the mass reconstruction using strong and weak gravitational lensing. This will not only allow us to compute constraints on the dark matter self-interaction from the system, but also to compare the cluster properties to expectations from mass-observable scaling relations. Complementary GMOS multi-object spectroscopy for the cluster has already been approved, yielding the final piece needed for a comprehensive multi-wavelength analysis of this extreme cluster. The observations of SPT-CL-J2228-5828 will incorporate a 2x2 mosaic with ACS in F606W and F814W, plus central observations with WFC3/IR in F140W. All observations will be conducted during Continuous Viewing Zone (CVZ) opportunities. We request permission to "craft" the ACS observations (2 CVZ orbits per pointing), scheduling F606W imaging preferentially when HST is not observing close to Earth's bright limb, keeping the impact of Earthshine low in this filter. Observations will be well dithered, covering the ACS chip gap. The WFC3/IR imaging (1 CVZ orbit) consists of four main overlapping pointings, each containing 3 dithered exposures. A constraint on the overall orientation is required for the WFC3/IR visit to ensure a good coverage (6 exposures) over the inner regions of both cluster cores. Additional peripheral cluster regions will be covered by 3 exposures. The observations are part of a multi-wavelength campaign to characterise the merging cluster SPT-CL-J2228-5828. PI Zohren & CoI Schrabback are experts in weak lensing studies of clusters. CoIs Sharon and Mahler are experts in cluster strong lensing analyses. CoI Zenteno is an expert in optical and spectroscopic cluster studies. CoI Bulbul is an expert in cluster X-ray measurements. CoIs Sommer, Bleem, and Bayliss have experience in a broad range of cluster multi-wavelength investigations, including SZ, X-ray, and optical/NIR measurements. Large Scale Structure of the Universe 6 false false false false false false false SUPPORTED CLUSTER OF GALAXIES GRAVITATIONAL LENS HIGH REDSHIFT CLUSTER RICH CLUSTER J2000 J2000 ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/IR Imaging No No F140W POS-TARG DITHER 3.034 LINE false false 4 85.29 ACS-WFC-DITHER-LINE 1 false POS-TARG DITHER DITHER 4 5.183 WFC3-IR-DITHER-BOX-MIN false 74.653 true 0.365 0.572 3 81.859 POS-TARG WFC3-IR-DITHER-BLOB 18.528 3 false Hst Same orient constraint links visits (01 02 03 04 09 10 11 12) The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2021/hst/16488_phase2/OP-cache/16488_p2_fallbackall_swap_filters_visits_1-4-v01.xml (Tic-Visit :proposal-id 16488 :visit-id "01" :proposal-version -1 :trans-version "20200619" :date "17-Mar-2021 15:38:04.0" :trans-errors '(:WARNINGS 0 :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 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16488 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16488 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 4983 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 09 10 11 12) The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2021/hst/16488_phase2/OP-cache/16488_p2_fallbackall_swap_filters_visits_1-4-v12.xml (Tic-Visit :proposal-id 16488 :visit-id "12" :proposal-version -1 :trans-version "20200619" :date "17-Mar-2021 15:38:06.0" :trans-errors '(:WARNINGS 0 :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 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16488 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16488 :visit-id "12" :orbit-number 1 :pcs-time 383 :si-vis-utilization 4983 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 09 10 11 12) The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2021/hst/16488_phase2/OP-cache/16488_p2_fallbackall_swap_filters_visits_1-4-v02.xml (Tic-Visit :proposal-id 16488 :visit-id "02" :proposal-version -1 :trans-version "20200619" :date "17-Mar-2021 15:38:08.0" :trans-errors '(:WARNINGS 0 :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 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16488 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16488 :visit-id "02" :orbit-number 1 :pcs-time 383 :si-vis-utilization 4983 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 09 10 11 12) The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2021/hst/16488_phase2/OP-cache/16488_p2_fallbackall_swap_filters_visits_1-4-v03.xml (Tic-Visit :proposal-id 16488 :visit-id "03" :proposal-version -1 :trans-version "20200619" :date "17-Mar-2021 15:38:10.0" :trans-errors '(:WARNINGS 0 :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 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16488 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16488 :visit-id "03" :orbit-number 1 :pcs-time 383 :si-vis-utilization 4983 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 09 10 11 12) The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2021/hst/16488_phase2/OP-cache/16488_p2_fallbackall_swap_filters_visits_1-4-v04.xml (Tic-Visit :proposal-id 16488 :visit-id "04" :proposal-version -1 :trans-version "20200619" :date "17-Mar-2021 15:38:12.0" :trans-errors '(:WARNINGS 0 :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 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16488 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16488 :visit-id "04" :orbit-number 1 :pcs-time 383 :si-vis-utilization 4983 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 09 10 11 12) The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2021/hst/16488_phase2/OP-cache/16488_p2_fallbackall_swap_filters_visits_1-4-v09.xml (Tic-Visit :proposal-id 16488 :visit-id "09" :proposal-version -1 :trans-version "20200619" :date "12-Mar-2021 17:28:10.0" :trans-errors '(:WARNINGS 0 :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 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16488 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16488 :visit-id "09" :orbit-number 1 :pcs-time 383 :si-vis-utilization 4983 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 09 10 11 12) The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2021/hst/16488_phase2/OP-cache/16488_p2_fallbackall_swap_filters_visits_1-4-v10.xml (Tic-Visit :proposal-id 16488 :visit-id "10" :proposal-version -1 :trans-version "20200619" :date "12-Mar-2021 17:28:36.0" :trans-errors '(:WARNINGS 0 :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 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16488 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16488 :visit-id "10" :orbit-number 1 :pcs-time 383 :si-vis-utilization 4983 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 09 10 11 12) The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2021/hst/16488_phase2/OP-cache/16488_p2_fallbackall_swap_filters_visits_1-4-v11.xml (Tic-Visit :proposal-id 16488 :visit-id "11" :proposal-version -1 :trans-version "20200619" :date "12-Mar-2021 17:28:37.0" :trans-errors '(:WARNINGS 0 :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 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16488 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16488 :visit-id "11" :orbit-number 1 :pcs-time 383 :si-vis-utilization 4983 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 16488 :visit-id "08" :proposal-version -1 :trans-version "20200619" :date "27-Jan-2021 16:25:15.0" :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 3029168 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16488 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16488 :visit-id "08" :orbit-number 1 :pcs-time 383 :si-vis-utilization 4649 :al-overhead-at-end 0 :internal-dur-at-end 614 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0