0Assigned ID: 3169
----- Attempting Submission 1 (Fri Mar 25 09:33:30 GMT 2022) -----
HST Phase I Proposal 3169 successfully submitted.
Receipt: # 3169-1
----- Attempting Submission 2 (Fri Mar 25 22:55:02 GMT 2022) -----ORBITAL VISIBILITY OVERRUN
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ORBITAL VISIBILITY OVERRUN0----- Attempting Submission 1 (Sun Jul 10 20:06:47 GMT 2022) -----
----- Attempting Submission 2 (Thu Jul 28 23:46:20 GMT 2022) -----
----- Attempting Submission 3 (Thu Aug 31 05:59:17 GMT 2023) -----These warnings are from already completed visits.Escaping Lyman Continuum from the Overdensities of Extreme Emission Line Galaxies at z~2.2Collectively young massive stars dominate over supermassive black holes in producing the Lyman-continuum (LyC) radiation that reionized the Universe. Yet the direct measurement of such escaping LyC radiation has been challenging. ~50% of galaxies in the reionization epoch reside in protoclusters, hence the knowledge about LyC escaping from overdense environments is crucial. We propose to obtain deep WFC3/UVIS imaging in two massive protocluster fields at z~2.2, efficiently measuring the absolute LyC escape fraction (fesc) of 28 extreme emission line galaxies (EELGs) in total. These EELGs are identified from the existing deep WFC3/G141 slitless spectroscopy of the entire fields, showing prominent [O III]+Hbeta emission with extremely high equivalent width, perfect analogs of currently known galaxies at z~8. Targeting multiple overdensities helps mitigate the line-of-sight variations of intergalactic medium (IGM) transmission. The goals of this proposal are as follows. 1) Measure fesc of these EELGs residing in overdensities to 3-sigma upper limits of 1.6%(0.5%) per galaxy(sightline), to probe the environmental dependence of fesc. 2) Test whether faint galaxies or rare bright galaxies with high fesc dominate the reionization process, and calibrate the observational proxies of LyC leakage for future JWST work. 3) Break the degeneracy between fesc and the LyC production efficiency to measure the production rate of IGM-ionizing photons, constraining if the ionizing budget from EELGs is sufficient for reionization. Exploiting the unique UV capabilities of HST, our program presents a giant leap forward to establish the link between LyC escape and large-scale structure formation.In this program, we obtain in total 38 orbits of WFC3/UVIS imaging in the central regions of two galaxy protoclusters at z~2.2. The entire allocation is equally divided into two pointings (each on one protocluster field) with 18 orbits of F225W and 1 orbit of F475W, to cover the extreme emission line galaxies in these fields identified from existing spectroscopy. We employ some orient constraints to maximize the number of line emitters covered within the WFC3/UVIS footprint. We adopt full-orbit long exposures for the F225W imaging, to minimize the amount of post-flash needed to mitigate the charge transfer inefficiency and hence the background noise caused by the post-flash flux. To reach the desired level of 20 e-/pix recommended by STScI, we still need a post-flash of 10 e- for our F225W exposures, to optimally compensate for the loss of charge transfer efficiency over the entire CCD chips.
To speed up and facilitate the scheduling and executing processes given our full-orbit long F225W exposures and the reduced gyro capabilities of the aging telescope, we design a UVIS-DITHER-LINE-3PT dither pattern with moderate point spacing so that throughout our program, all F225W visits comprise three orbits. As a result, per pointing, we will conduct six F225W visits (each at 3-orbit depth) and one F475W visit (at 1-orbit depth separated into three exposures using the same dither pattern). Moreover, we request that per pointing, at least two out of the six F225W visits have the same telescope orient angle, so there is a chance that the same set of guide stars can be used for multiple visits (and thus >=6 individual exposures), which is highly conducive to straightforward astrometric alignment and cosmic ray flagging through median stacking.
The best-case scenario is that per pointing all three pairs of F225W visits have exactly the same orient. But if not possible given scheduling constraints, we request that the three pairs of F225W visits per pointing have orients with +/-180 or +/- 90 deg offsets in between, to maximize the overlapping spatial coverage of these visits to secure the maximum depth of the largest area in the sky, crucial to our science goals. In addition, for each pointing, the 1-orbit F475W visit should have orient identical to either one of the orients of the three pairs of the F225W visits, for the sake of maximum overlap in spatial coverage.Our team members have extensive experience on HST ultraviolet imaging (UVUDF, UVCANDELS, GO-13349, etc.), reduction and analysis of large and complex data sets, as well as the physical mechanisms of LyC escape.
The PI, Wang, is a core member of the UVCANDELS project (GO-15647) and the GLASS project (GO-13459), as well as the PI of the MAMMOTH-Grism program (GO-16276).
Co-I Teplitz is the PI of two treasury programs (e.g. UVUDF and UVCANDELS), as well as several medium/large HST programs, aimed at detecting the escaping LyC flux using cutting-edge UV instrumentations onboard HST (e.g. GO-10872, 11236, etc.)
Co-I Fan is the PI of a lot of HST programs, including GO-13349, which uses several UVIS filters to observe LyC flux from galaxies at z~2-2.5.
Co-I Cai is the PI of several HST programs, including GO-15266, which obtains the WFC3/F160W imaging of the field targeted by this proposal.
Co-I Colbert is the PI of GO-14123, which employs the ACS/SBC to target the escaping LyC flux from galaxies at z~1.5.
Co-I Alavi is the co-PI of GO-15940, which uses the same filter setting of UVIS/F225W covering the six Hubble Frontier Fields.
Co-I Malkan has been leading the large WISPs project over several years, and is particularly efficient at managing large collaborative groups.
Co-I Henry is the PI of several HST programs, and has great expertise in LyC escaping mechanisms.
Co-Is Bian, Zheng, Shi and Li have institutional access to ground-based telescopes and solid background in the theoretical interpretation of LyC escape.
We have organized ourselves into 6 working groups: 1) Data reduction and imaging mosaics (Wang, Li, Shi, Alavi); 2) Photometric catalogs (Wang, Alavi, Shi, Cai, Li); 3) fesc measurement of individual LyC galaxies (Wang, Alavi, Bian, Fan, Teplitz); 4) Stacking analysis to derive upper limits on fesc (Alavi, Bian, Wang, Colbert, Teplitz); 5) Physical interpretation of the environmental dependence of fesc (Henry, Bian, Wang, Teplitz, Fan) 6) Ground based follow-up of confirmed LyC leakers (Bian, Fan, Malkan, Zheng, Shi). Several team members will lead follow-up observations of the confirmed LyC leaking galaxies, with their institutional access to Keck, VLT, LBT, MMT, WIYN, Palomar, CFHT and other large ground-based telescopes.GalaxiesLarge Scale Structure of the Universe6falsefalsetruefalsefalsefalsefalsefalseSUPPORTEDCLUSTER OF GALAXIESHIGH REDSHIFT CLUSTERJ2000J2000CLUSTER OF GALAXIESHIGH REDSHIFT CLUSTERJ2000J2000CLUSTER OF GALAXIESHIGH REDSHIFT CLUSTERJ2000J2000CLUSTER OF GALAXIESHIGH REDSHIFT CLUSTERJ2000J2000WFC3/UVISImagingNoNoF225WWFC3/UVISImagingNoNoF475WWFC3/UVISImagingNoNoF225WWFC3/UVISImagingNoNoF475WPOS-TARGDITHER0.135LINEfalsefalse346.84WFC3-UVIS-DITHER-LINE-3PT3falseHst Same orient constraint links visits (01 02 03 04 05 06 07)The scheduling data was generated by CASM 31.1.CASM was run in Phase II mode./private/var/folders/c1/lll0dc_165x5dd5dj2f1vgqc0000gn/T/OPVisit12460012019683707832.xmlIf there is an over-subscription in the scheduling windows or problems assigning a single orient for all 19 orbits (visits 01-07), please contact the PI immediately to discuss the possibilities and requirements to use the +/-180 or +/- 90 deg orient offsets for a subset of visits.1685860054000113.5(Tic-Visit
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PI prefers the orient of 293.5 deg. To ensure timely execution of this visit, which is the only F475W imaging in this field, we created a new target which opens the schedulability window in late 2023 to early 2024. Please help schedule the repeat of this visit during this window. If not possible, then please contact the PI to discuss the possibility to revert back to the original setting of this visit, such that it can be scheduled in mid-2024.(Tic-Visit
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(Tic-Obset
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(Tic-Orbit
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:proposal-id 17159
:visit-id "10"
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(Tic-Obset
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(Tic-Orbit
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(Tic-Orbit
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(Tic-Orbit
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)true33Hst Same orient constraint links visits (08 09 10 11 12 13 14)The scheduling data was generated by CASM 31.1.CASM was run in Phase II mode./private/var/folders/c1/lll0dc_165x5dd5dj2f1vgqc0000gn/T/OPVisit18150135140872746809.xmlIf there is an over-subscription in the scheduling windows or problems assigning a single orient for all 19 orbits (visits 08-14), please contact the PI immediately to discuss the possibilities and requirements to use the +/-180 or +/- 90 deg orient offsets for a subset of visits.1692176204000103.10001(Tic-Visit
:proposal-id 17159
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:proposal-version -1
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(Tic-Obset
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)
(Tic-Orbit
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(Tic-Orbit
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(Tic-Orbit
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)true33Hst Same orient constraint links visits (08 09 10 11 12 13 14)The scheduling data was generated by CASM 31.1.CASM was run in Phase II mode./private/var/folders/c1/lll0dc_165x5dd5dj2f1vgqc0000gn/T/OPVisit12818236955129428307.xmlIf there is an over-subscription in the scheduling windows or problems assigning a single orient for all 19 orbits (visits 08-14), please contact the PI immediately to discuss the possibilities and requirements to use the +/-180 or +/- 90 deg orient offsets for a subset of visits.1692250327000103.10001(Tic-Visit
:proposal-id 17159
:visit-id "12"
:proposal-version -1
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(Tic-Obset
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)
(Tic-Orbit
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(Tic-Orbit
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(Tic-Orbit
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)true33Hst Same orient constraint links visits (08 09 10 11 12 13 14)The scheduling data was generated by CASM 31.1.CASM was run in Phase II mode./private/var/folders/c1/lll0dc_165x5dd5dj2f1vgqc0000gn/T/OPVisit11323339906593283908.xmlIf there is an over-subscription in the scheduling windows or problems assigning a single orient for all 19 orbits (visits 08-14), please contact the PI immediately to discuss the possibilities and requirements to use the +/-180 or +/- 90 deg orient offsets for a subset of visits.1692318748000103.10001(Tic-Visit
:proposal-id 17159
:visit-id "13"
:proposal-version -1
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(Tic-Obset
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)
(Tic-Orbit
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(Tic-Orbit
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(Tic-Orbit
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)true33Hst Same orient constraint links visits (51 52 53)The scheduling data was generated by CASM 31.1.CASM was run in Phase II mode./Users/wangxin/Dropbox/proposals/MAMMOTH-LyC/phaseII_230831/OP-cache/17159_230825-v51.xml*IMPORTANT*
PI prefers the orient of 283.1 deg. To ensure timely execution of this visit, we created a new target which opens the schedulability window in early 2024. Please help schedule the repeat of this visit during this window. If not possible, then please contact the PI to discuss the possibility to revert back to the original setting of this visit, such that it can be scheduled in mid-2024.(Tic-Visit
:proposal-id 17159
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(Tic-Obset
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)
(Tic-Orbit
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(Tic-Orbit
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(Tic-Orbit
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)true30Hst Same orient constraint links visits (51 52 53)The scheduling data was generated by CASM 31.1.CASM was run in Phase II mode./Users/wangxin/Dropbox/proposals/MAMMOTH-LyC/phaseII_230831/OP-cache/17159_230825-v52.xmlTo ensure timely execution of this visit, we created a new target which opens the schedulability window in early 2024. Please help schedule the repeat of this visit during this window. If not possible, then please contact the PI to discuss the possibility to revert back to the original setting of this visit, such that it can be scheduled in mid-2024.(Tic-Visit
:proposal-id 17159
:visit-id "52"
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:trans-version "20230627"
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(Tic-Obset
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(Tic-Orbit
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(Tic-Orbit
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)
(Tic-Orbit
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:pcs-gap 0
)true30Hst Same orient constraint links visits (51 52 53)The scheduling data was generated by CASM 31.1.CASM was run in Phase II mode./Users/wangxin/Dropbox/proposals/MAMMOTH-LyC/phaseII_230831/OP-cache/17159_230825-v53.xmlTo ensure timely execution of this visit, we created a new target which opens the schedulability window in early 2024. Please help schedule the repeat of this visit during this window. If not possible, then please contact the PI to discuss the possibility to revert back to the original setting of this visit, such that it can be scheduled in mid-2024.(Tic-Visit
:proposal-id 17159
:visit-id "53"
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:trans-version "20230627"
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(Tic-Obset
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)
(Tic-Orbit
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:low-sky "N"
:pcs-visibility 3179
:pcs-gap 0
)true10Hst Same orient constraint links visits (08 09 10 11 12 13 14)The scheduling data was generated by CASM 31.1.CASM was run in Phase II mode./private/var/folders/c1/lll0dc_165x5dd5dj2f1vgqc0000gn/T/OPVisit1810412792254484939.xmlIf there is an over-subscription in the scheduling windows or problems assigning a single orient for all 19 orbits (visits 08-14), please contact the PI immediately to discuss the possibilities and requirements to use the +/-180 or +/- 90 deg orient offsets for a subset of visits.1689540485000103.10000000000002(Tic-Visit
:proposal-id 17159
:visit-id "14"
:proposal-version -1
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(Tic-Obset
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)
(Tic-Orbit
:proposal-id 17159
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)true11