Science Keywords: Select from 2 to 5 items. Science Keywords is a required field. 0 Assigned ID: 1508 ----- Attempting Submission 1 (Fri Aug 11 17:02:04 GMT 2017) ----- Joint Chandra/HST Proposal loads This is a re-subsmission with a new visit (#55) added to replace the failed first attemp at observing visit #2. 836692682 ----- Attempting Submission 1 (Mon Sep 11 17:54:36 GMT 2017) ----- ----- Attempting Submission 2 (Fri Feb 08 18:14:35 GMT 2019) ----- ----- Attempting Submission 3 (Tue Mar 19 15:42:22 GMT 2019) ----- Does the Brightest Strongly Lensed Galaxy Contain An AGN? We have recently discovered the brightest lensed galaxy known. Rest-frame UV through optical spectra reveal a wealth of spectral diagnostics, providing a unique window on the physical conditions of star formation at the epoch when most stars formed. The major caveat is that at present, we do not know whether this lensed galaxy hosts an AGN that is contributing substantially to the ionizing photon flux, effectively throwing off the nebular line diagnostics. We propose a 40 ks Chandra observation to definitively constrain the X-ray luminosity of an active nucleus, supported by a joint 6 orbit observation with HST to perform complementary UV narrow-band mapping and imaging to support strong lens modeling to interpret the geometry of the lens. The HST data being collected for this program includes optical and near-infrared imaging of the brightest strongly lensed galaxy currently known using the Wide-Field Camera 3 Infrared channel (WFC3/IR). We will collect four imaging bands, spanning the optical through NIR.. The data collected in this program will be combined with imaging in four additional broadband filters and one narrow/medium-band filter, as well as WFC3 prism spectroscopy, from a separate HST program, GO-15101. These HST data will be analyzed jointly with scheduled Chandra X-ray observations of the giant arc, as well as extensive ground-based data. Massive Black Holes And Their Host Galaxies 6 false false false false false false false SUPPORTED GALAXY STARBURST YES J2000 J2000 R=17.82, z=17.38, J=16.75, Ks=15.43 (Vega) WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F606W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F098M POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 4 false POS-TARG DITHER 0.605 LINE false false 3 41.788 WFC3-IR-DITHER-LINE-3PT 5 false POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 6 false The scheduling data was generated by CASM 27.0. 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