A Remarkable Wide Separation Lensed Quasar

Place holder proposal - PI has been taken out by Covid day in the past 24 hours . 1501058003 Assigned ID: 4713 ----- Attempting Submission 1 (Wed May 24 22:10:08 GMT 2023) ----- HST Phase I Proposal 4713 successfully submitted. Receipt: # 4713-1 ----- Attempting Submission 2 (Wed May 24 22:14:50 GMT 2023) ----- 0 ----- Attempting Submission 1 (Mon Sep 11 17:53:38 GMT 2023) ----- A Remarkable Wide Separation Lensed Quasar We propose broadband HST imaging of a newly discovered wide-separation lensed quasar (WSLQ). There are only 7 WSLQs in the literature from 20 years of searching, and this new WSLQ is spectacular. The lensing cluster at z=0.42 is the most massive WSLQ lens found to date and is lensing a low luminosity quasar at z=1.524; initial ground-based imaging and spectroscopy shows four other obvious multiply-imaged sources, one of which is a second multiply-imaged AGN (obscured in this case, but readily apparent from emmission lines) at z=1.939. Both lensed AGN have multiply-imaged companion galaxies, and the foreground quasar shows numerous MgII absorbers - one of which matches one of the spectroscopically confirmed companions. Remarkably, the host galaxy of the quasar is also evident in ground-based NIR imaging, and so HST resolution will allow for a probe of quasar feedback in the host from color gradients. The scientific possibilities with this new discovery are manifold; we propose here a modest 8-orbit imaging program to acquire the data necessary to immediately build a robust strong lens model, which will rapidly unlock the potential of this new discovery. This is a 5-band imaging program of a newly discoverd wide-separation lensed quasar. The 8 allocated orbits are split into three 2-orbit visits for observations in 3 ACS filters, plus one 2-orbit visits for observations in 2 WFC3-IR filters. The ACS observations have the strong-lensing center centered on Chip 1, which keeps the entire region of high magnification (in which objects of interest appear) within one chip regardless of roll angle. Across two orbits (for each filter) we use a total of 8 exposures, with a 2-point ACS-WFC-DITHER-LINE to span the chip gap between orbits, and a 4-point ACS-WFC-DITHER-BOX within each orbit to sample the PSF and reject outliers of various sorts. No post-flash is neede in any of these observations. The WFC3-IR observations are centered on the single decector, sufficient to map the whole region of high lensing magnification regardless of roll angle. Each filter gets 6 integrations; we've choseen to do a manual postarg for each orbit that replicates the WFC3-IR-DITHER-BLOB pattern in order to have maximum control over NSAMP/SAMPSEQ value and optimize orbit packing. This is coupled with the WFC3-IR-DITHER-LINE-3PT pattern within each filter in each orbit for PSF sampling. stuff Galaxies Supermassive Black Holes and Active Galaxies 6 false false false false false false false false SUPPORTED CLUSTER OF GALAXIES GRAVITATIONAL LENS RICH CLUSTER J2000 J2000 ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/IR Imaging No No F105W WFC3/IR Imaging No No F125W POS-TARG DITHER DITHER 4 3.034 ACS-WFC-DITHER-BOX false 69.02 false 0.1856 0.2637 2 85.29 POS-TARG ACS-WFC-DITHER-LINE 20.7 1

true

POS-TARG DITHER 0.605 LINE false false 3 41.788 WFC3-IR-DITHER-LINE-3PT 3

false

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