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Andromeda's Parachute: A Bright Quadruply Lensed Quasar at z = 2.377

Rubin, Kate H. R. and O’Meara, John M. and Cooksey, Kathy L. and Matuszewski, Mateusz and Rizzi, Luca and Doppmann, Greg and Kwok, Shui and Martin, D. Christopher and Moore, Anna M. and Morrissey, Patrick and Neill, James D. (2018) Andromeda's Parachute: A Bright Quadruply Lensed Quasar at z = 2.377. Astrophysical Journal, 859 (2). Art. No. 146. ISSN 1538-4357. doi:10.3847/1538-4357/aaaeb7.

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We present Keck Cosmic Web Imager spectroscopy of the four putative images of the lensed quasar candidate J014710+463040 recently discovered by Berghea et al. The data verify the source as a quadruply lensed, broad absorption-line quasar having z_s = 2.377 ± 0.007. We detect intervening absorption in the Fe II λλ2586, 2600, Mg II λλ2796, 2803, and/or C IV λλ1548, 1550 transitions in eight foreground systems, three of which have redshifts consistent with the photometric-redshift estimate reported for the lensing galaxy (z_L ≈ 0.57). The source images probe these absorbers over transverse physical scales of ≈0.3–22 kpc, permitting assessment of the variation in metal-line equivalent width W_r as a function of sight-line separation. We measure differences in W_(r,2796) of <40% across most of the sight-line pairs subtending 8–22 kpc, suggestive of a high degree of spatial coherence for the Mg II-absorbing material. W_(r,2600) varies by >50% over the same scales across the majority of sight-line pairs, while C IV absorption exhibits a wide range in W_(r,1548) differences of ≈5%–80% within transverse distances of 3 kpc. These spatial variations are consistent with those measured in intervening absorbers detected toward lensed quasars drawn from the literature, in which W_(r,2796) and W_(r,1548) vary by ≤20% in 35 ± 7% and 47 ± 6% of sight lines separated by <10 kpc, respectively. J014710+463040 is one of only a handful of z > 2 quadruply lensed systems for which all four source images are very bright (r = 15.4–17.7 mag) and are easily separated in ground-based seeing conditions. As such, it is an ideal candidate for higher-resolution spectroscopy probing the spatial variation in the kinematic structure and physical state of intervening absorbers.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Rubin, Kate H. R.0000-0001-6248-1864
O’Meara, John M.0000-0002-7893-1054
Rizzi, Luca0000-0003-0882-2327
Martin, D. Christopher0000-0002-8650-1644
Moore, Anna M.0000-0002-2894-6936
Morrissey, Patrick0000-0001-8177-1023
Neill, James D.0000-0002-0466-1119
Additional Information:© 2018 The American Astronomical Society. Received 2017 July 17; revised 2018 February 5; accepted 2018 February 9; published 2018 June 1. K.L.C. acknowledges support from NSF grant AST-1615296. The authors wish to thank Jessica Werk and Dylan Nelson for illuminating discussions of these results, and we thank Jessica Werk for her reading and critique of this manuscript. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. Finally, the authors dedicate this work to the memory of Jerry Nelson, without whom the immense contributions to science made by the Keck Observatory would not be possible. Facility: Keck:II (KCWI). -
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:gravitational lensing: strong – intergalactic medium – quasars: absorption lines – techniques: imaging spectroscopy
Issue or Number:2
Record Number:CaltechAUTHORS:20180601-125613333
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Official Citation:Kate H. R. Rubin et al 2018 ApJ 859 146
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86744
Deposited By: Tony Diaz
Deposited On:01 Jun 2018 20:19
Last Modified:15 Nov 2021 20:41

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