0Assigned ID: 2912
----- Attempting Submission 1 (Wed Mar 23 21:35:08 GMT 2022) -----
HST Phase I Proposal 2912 successfully submitted.
Receipt: # 2912-1
----- Attempting Submission 2 (Fri Mar 25 00:36:17 GMT 2022) -----
HST Phase I Proposal 2912 successfully submitted.
Receipt: # 2912-2
----- Attempting Submission 3 (Fri Mar 25 00:40:26 GMT 2022) -----
HST Phase I Proposal 2912 successfully submitted.
Receipt: # 2912-3
----- Attempting Submission 4 (Fri Mar 25 22:05:13 GMT 2022) -----This pattern is not used in this proposal.Re-submitted, second attempt to incorporate new ACS dither pattern default parameters from the new version of APT.-1077685220----- Attempting Submission 1 (Wed Jul 13 19:09:55 GMT 2022) -----
HST Phase II Proposal 17084 successfully submitted.
Receipt: # 17084-1
----- Attempting Submission 2 (Wed Jul 13 19:26:21 GMT 2022) -----
Your proposal could not be saved.
Submission aborted.
----- Attempting Submission 3 (Thu Aug 25 17:01:39 GMT 2022) -----
----- Attempting Submission 4 (Tue Sep 20 21:10:36 GMT 2022) -----I am keeping the old (deprecated?) ACS-DITHER-BOX pattern in there for reference.Zooming In On Two Strongly Lensed Galaxies During the Epoch of Re-IonizationDeep field observations with the Hubble Space Telescope have revealed several hundred galaxy candidates in the universe's first billion years leading up to re-ionization, but only a small fraction are bright enough (H<24 AB) for detailed, high-S/N spectroscopic follow-up study with the James Webb Space Telescope (JWST). We propose for WFC3/IR + ACS imaging observations of two exceptionally bright (F110W_AB~23.8) z~7 dropout galaxies that were recently identified in archival HST data. Both targets appear as multiply imaged pairs near the cores of massive foreground galaxy clusters, indicating that they are strongly lensed, and therefore highly magnified. While both lensed sources appear as exceptionally bright z~7 galaxies, their intrinsic brightnesses are much smaller. Unlike the brightest high-z galaxies discovered in deep fields, our target source are drawn from the population of faint high-z galaxies that are likely responsible for re-ionization. These lensed sources provide a unique opportunity to performe detailed studies of typical, intrinsically faint, galaxies during the epoch of re-ionization. Our proposed observations will simultaneously achieve three science goals: 1) inform a detailed strong lensing model for each system (necessary to recover their true intrinsic properties), 2) measure the stellar mass and UV spectral slopes of multiple spatially resolved (via lensing magnification) star-forming clumps in each dropout galaxy, and 3) reduce photometric redshift uncertainties for both lensed galaxies by a factor >3x (necessary to plan future spectroscopic observations).The goal of this prorgam is to observed two different targets in F814W with ACS and in F098M+F160W imaging with WFC3/IR. The purpose of the observations are to sample the spectral energy distributions of both foreground cluster galaxies and candidate strongly lensed dropout galaxies at z>6.
Each target will receive two orbits of data. The first orbit for each target will be spent entirely on F814W (ACS) imaging, and the second orbit will be split between the F098M and F160W imaging using WFC3/IR. The observations will be organized into two visits, one for each target. Each visit will contain two orbits (one using ACS the other using WFC3/IR).
This being a 4 orbit program, we are splitting orbits up quite aggressively. Our observations are designed with the biggest priority being that we obtain a minimum of 4 dithered observations in each band, for each target. For ACS/WFC F814W imaging we use the ACS-WFC-DITHER-BOX, and split a single orbit up into 4 equal exposures that use the full target visibility window. For WFC3/IR F098M and F160W we use a pattern composed of a macro-scale dither (a 2pt version of WFC3-IR-DITHER-BLOB) with a sub-pattern that has a small-scale dither (a 2 pt version of WFC3-IR-DITHER-LINE).
For the WFC3/IR imaging we try to maximize the value of NSAMP to improve cosmic ray rejection and minimize readnoise. However, we are packing a lot of exposures (8) into a single orbit and so buffer dumping constraints require us to use longer individual integrations with lower values of NSAMP that would be strictly optimal from a signal-to-noise perspective. That said, our targets are quite bright and so we prioritize having 4 dither points over maximizing NSAMP in our exposures.
Any thoughts/feedback/comments from the instrument experts would be very much welcome!Members of this proposal team have extensive expertise working with massive galaxy clusters and using strong lensing to study the properties of highly magnified galaxies across the entire observable electromagnetic spectrum.
Prof. M. Bayliss is an expert on multi-wavelength studies of star formation, gravitational lensing, and galaxy clusters. He has worked with imaging and spectroscopic data from the X-ray to the near infrared, and is an experienced user of Hubble, Chandra, and numerous 6-10m class ground based telescopes. Prof. Bayliss has led 5 HST observing programs, all studies of highly magnified strong lensing systems, and will serve as the overall project lead. All CoIs below will also contribute to some or all of: data reduction, analysis, and paper-writing.
Prof. Michael Gladders is a galaxy cluster and strong lensing expert, with extensive experience in data handling and analysis (spectroscopic and photometric) and a publication record of currently 196 refereed papers. He has built two instruments for the Magellan telescopes, and is an active user of many of the world's largest telescopes, and HST. His research group at the University of Chicago is focused on exploiting emerging galaxy cluster and strong lensing samples to answer questions about galaxy and structure formation and evolution.
Prof. Sharon leads the lensing analysis of several ongoing lensing survey. Sharon and her research group, including Remolina Gonzalez and Mahler, have ample experience in lens modeling and analysis of cluster lenses of all scales (including Frontier Fields, Johnson et al. 2014, Remolina Gonzalez et al. 2018; RELICS, Cerny et al. 2018, Paterno-Mahler et al. 2018; and SGAS, Sharon et al. 2019)
Co-I Kim is a postdoc at the University of Cincinnati working with PI Bayliss, and is an expert on the properties of extreme emission line galaxies in the low-redshift universe, which are thought to be analogs of the galaxies that re-ionized the universe (i.e. the targets of this proposal).
Co-I Roberson is a graduate student at the University of Cincinnati working with PI Bayliss, and has experience working on SED model analyses of high redshift star-forming galaxies.
Co-I Navarre is a graduate student at the University of Cincinnati working with PI Bayliss, and has experience analyzing the emission line properties of high redshift star-forming galaxies.
Dr. Mahler is an expert in strong lensing with ample experience in modeling the HFF clusters (Mahler et al. 2018) is part of the LENSTOOL development team, and is an expert in MUSE IFU spectroscopy analysis.
Dr. L. Bleem is an expert on multi-wavelength analysis and modeling of massive galaxy clusters.
Prof. Brodwin is an expert on multi-wavelength studies of massive galaxy clusters, with particular expertise on the highest redshift galaxy clusters.
Co-I Khullar is a graduate student at the University of Chicago with expertise in SED modeling and analysis of faint galaxy spectroscopy and HST imaging.
Co-I Dr. Ansarinejad has experience with SED fitting and measuring source sizes and star formation rates of z>6 sub-mm galaxies, based on analysis of multi-wavelength observations from HST, WHT and ALMA.
CoI Napier is a graduate student at the University of Michigan with experience generating strong lensing models of massive galaxy clusters.
Co-I Calzadilla is a graduate student at the Massachusetts Institute of Technology with expertise analyzing multi-wavelength observations of galaxy clusters, including the South Pole Telescope clusters acting as the lenses for our proposed targets.
Co-I Floyd is a graduate student at the University of Missouri-Kansas City with expertise analyzing the galaxy populations in massive galaxy clusters, including the South Pole Telescope clusters acting as the lenses for our proposed targets.Galaxies6falsefalsefalsefalsefalsefalsefalseSUPPORTEDGALAXYGRAVITATIONAL LENSHIGH REDSHIFT GALAXYJ2000J2000F110W = 23.8GALAXYGRAVITATIONAL LENSHIGH REDSHIFT GALAXYJ2000J2000F110W = 23.8ACS/WFCImagingNoNoF814WWFC3/IRImagingNoNoF098MWFC3/IRImagingNoNoF160WACS/WFCImagingNoNoF814WWFC3/IRImagingNoNoF098MWFC3/IRImagingNoNoF160WPOS-TARGDITHERDITHER25.183WFC3-IR-DITHER-LINEfalsetrue0.636241.859POS-TARGWFC3-IR-DITHER-BLOB41.7883truePOS-TARGDITHER0.262This is the old (deprecated?) ACS-DITHER-BOX pre-defined pattern.LINE0.192falsefalse68.14418.39ACS-WFC-DITHER-BOX4falsePOS-TARGDITHER0.2637LINE0.1856falsefalse69.02420.7ACS-WFC-DITHER-BOX5false/private/var/folders/pk/m_8hyd3n6cb56rq6lfp0c_xc0000gn/T/OPVisit5350493986940055154.xmlThe scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.(Tic-Visit
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