POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE POS TARG OUTSIDE OF APERTURE This submission corresponds to the setting for the ORIENT range 89-91deg, which can be scheduled in the time windows 2019.328:16:21:14- 2019.328:22:45:40 and 2019.330:16:01:01- 2019.330:22:25:43. Compared to the previous submission we reduced NSAMP in Exposure 5 of each visit from 8 to 7, in order to stay within the orbit allocation. 875045235 ----- Attempting Submission 2 (Thu Jul 18 10:40:08 GMT 2019) ----- ----- Attempting Submission 3 (Fri Sep 27 13:13:14 GMT 2019) ----- ----- Attempting Submission 4 (Mon Oct 07 20:15:09 GMT 2019) ----- We use POS TARG to create the mosaic and dither positions. Deep Sunyaev-Zel'dovich (SZ) surveys are discovering massive galaxy clusters out to redshifts z>1. These powerful samples probe the cosmological growth of structure at an epoch well before dark energy started to dominate the cosmic expansion. In order to derive competitive cosmological constraints from these clusters we first need to tightly constrain their absolute mass scale, requiring deep weak lensing (WL) follow-up observations for a large number of targets. This is within the reach of an HST Large Program (LP) if the observations are carefully designed. We have identified a suitable observing strategy that is both efficient and yields well-controlled systematics. To prepare for a future LP proposal we propose a pilot investigation that allows us to demonstrate this new strategy and study one of the most extreme objects in the distant Universe: According to its SZ signature SPT-CLJ2106-5844 (z=1.132) constitutes the single most massive SZ-discovered cluster at z>1 known to date. An existing 2x2 ACS F606W mosaic provides WL shape measurements out to the virial radius, but needs to be complemented with a matching WFC3/IR mosaic in F105W and F160W to robustly select the distant background galaxies carrying the WL signal. Continuous Viewing Zone (CVZ) opportunities and a background-minimizing exposure sequence allow us to obtain the required 8-pointing, 2-filter WFC3/IR mosaic to the required depth in 4 CVZ orbits only. The new observations are expected to tighten the previous WL mass constraints of the cluster by a factor ~2.2. This also allows us to quantify how well the cluster mass agrees with the expected mass range for the most massive high-z clusters. This program aims to obtain an 8 pointing WFC3/IR mosaic in F105W+F160W that covers the outer parts of the massive galaxy cluster SPT-CL-J2106-5844, thereby complementing WFC3/IR observations that have already been obtained for the cluster core by other programs. The WFC3/IR mosaic should be aligned such that it provides good overlap with an existing ACS/WFC 2x2 mosaic in F606W. In combination, the three band observations will facilitate an efficient photometric selection of high-redshift background galaxies for weak lensing measurements. To reach the target depth in a minimum number of orbits the observations will employ continuous viewing zone (CVZ) opportunities that are available for the target. Their increased orbital visibility allows us to reach the depth requirements for two WFC3/IR pointings and both filters in a single CVZ orbit. For this, we request permission to craft the orbits, scheduling the F105W imaging, whose depth is key for the weak lensing source selection, during the half of the orbit when HST is in Earth's shadow. This keeps the background contributions from coronal Helium I emission and earth shine low. F160W is not affected by coronal Helium I emission and only moderately affected by earth shine, which is why the required F160W depth can be reached during the remaining half of the orbit. This observing strategy provides an exposure time of 1009s in F160W (959s in F105W) in each pointing, split into three exposures each. In order to maximize the overlap with the ACS data, the exact WFC3 pointings and orientations need to be adjusted, depending on the CVZ opportunity in which the observations are scheduled. This phase 2 submission (with 89d<ORIENT<91d) corresponds to the CVZ opportunity occurring in the time windows 2019.328:16:21:14- 2019.328:22:45:40 and 2019.330:16:01:01- 2019.330:22:25:43, which provides good overlap with the ACS mosaic and moderate zodiacal background. PI Schrabback has led several previous weak lensing studies, including both ground-based observations (Schrabback et al. 2015, 2018b) and HST data (Schrabback et al. 2007, 2010, 2018a). In particular, Schrabback et al. (2018a) present an HST weak lensing analysis of 13 distant galaxy clusters from SPT (including the initial analysis for our target SPT-CLJ2106-5844), which provided a key ingredient to the latest SPT cluster cosmology analysis (Bocquet et al. 2018). So far, the PI has been the PI of 3 HST weak lensing programs: the results from program 13493 were published in Thoelken et al. (2018), led by a PhD student under the PIs supervision. Initial results from program 13412 have been published in Bleem et al. (2015), McDonald et al. (2016), and Bayliss et al. (2016), and a larger weak lensing analysis paper is currently in preparation. The analysis for program 14677 (which targets clusters at even higher redshifts) is currently being conducted by PhD student Hannah Zohren under the PIs supervision. Further extensive experience in cluster weak lensing studies is provided by CoIs Hoekstra (who is also leading the Euclid weak lensing science working group) and von der Linden (e.g. Hoekstra et al. 2007, 2011a, 2011b, 2013, 2015; von der Linden et al. 2014a,b). CoIs Sharon and Mahler are experts in strong lensing cluster studies. In a second step they will combine our weak lensing measurements with strong lensing constraints from the cluster core, providing a further refined mass reconstruction and analysis. CoI Bleem is chairing the SPT cluster science working group (the PI and the other CoIs are members), also preparing the samples for our envisaged future Large Program proposal. CoI Brodwin is an expert in multi-wavelength cluster evolution studies. He will employ the proposed 3 filter mosaic to investigate the properties of cluster galaxies out to the virial radius. 6 false false false false false false false SUPPORTED CLUSTER OF GALAXIES GRAVITATIONAL LENS HIGH REDSHIFT CLUSTER RICH CLUSTER J2000 J2000 WFC3/IR Imaging No No F140W 1570478746812 Hst Same orient constraint links visits (01 02 03 04) The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2019/hst_wl_proposal_cycle27/OP-cache/15883_3exp_v3-v01.xml (Tic-Visit :proposal-id 15883 :visit-id "01" :proposal-version -1 :trans-version "20190514" :date "07-Oct-2019 22:05:45.0" :trans-errors '(:WARNINGS 12 :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 1775712 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15883 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 15883 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 4780 :al-overhead-at-end 0 :internal-dur-at-end 557 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 1570478749036 Hst Same orient constraint links visits (01 02 03 04) The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2019/hst_wl_proposal_cycle27/OP-cache/15883_3exp_v3-v02.xml (Tic-Visit :proposal-id 15883 :visit-id "02" :proposal-version -1 :trans-version "20190514" :date "07-Oct-2019 22:05:48.0" :trans-errors '(:WARNINGS 12 :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 1775712 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15883 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 15883 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 4782 :al-overhead-at-end 0 :internal-dur-at-end 557 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 1570478750996 Hst Same orient constraint links visits (01 02 03 04) The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. /home/schrabba/repositories/sptoir/2019/hst_wl_proposal_cycle27/OP-cache/15883_3exp_v3-v03.xml (Tic-Visit :proposal-id 15883 :visit-id "03" :proposal-version -1 :trans-version "20190514" :date "07-Oct-2019 22:05:50.0" :trans-errors '(:WARNINGS 12 :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 1775712 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15883 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 15883 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 4784 :al-overhead-at-end 0 :internal-dur-at-end 557 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) true 1 0 1570478752972 Hst Same orient constraint links visits (01 02 03 04) The scheduling data was generated by CASM 27.2. 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