Discovery of a Damped Lyα Galaxy at z ∼ 3 toward the Quasar SDSS J011852+040644

Creators: Joshi, Ravi; Fumagalli, Michele; Srianand, Raghunathan; Noterdaeme, Pasquier; Petitjean, Patrick; Rafelski, Marc; Mackenzie, Ruari; Li, Qiong; Cai, Zheng; Martin, D. Christopher; Zou, Siwei; Wu, Xue-Bing; Jiang, Linhua; Ho, Luis C.

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Abstract

We report the detection of the host galaxy of a damped Lyα system (DLA) with log N(H i) [cm⁻²] = 21.0 ± 0.10 at z ≈ 3.0091 toward the background quasar SDSS J011852+040644 using the Palomar Cosmic Web Imager at the Hale (P200) telescope. We detect Lyα emission in the dark core of the DLA trough at a 3.3σ confidence level, with Lyα luminosity of L(Lyα) = (3.8 ± 0.8) × 10⁴² erg s⁻¹, corresponding to a star formation rate of ≳2 M_⊙ yr⁻¹ (considering a lower limit on Lyα escape fraction f_(esc)^(Lyα) ~2%) as typical for Lyman break galaxies at these redshifts. The Lyα emission is blueshifted with respect to the systemic redshift derived from metal absorption lines by 281 ± 43 km s−1. The associated galaxy is at very small impact parameter of ⩽12 kpc from the background quasar, which is in line with the observed anticorrelation between column density and impact parameter in spectroscopic searches tracing the large-scale environments of DLA host galaxies.

Additional Information

© 2021. The American Astronomical Society. Received 2019 September 4; revised 2020 November 10; accepted 2020 December 4; published 2021 February 18. We thank the anonymous referee for useful comments. This research uses data obtained through the Telescope Access Program (TAP). This work was supported by the National Key R&D Program of China (2016YFA0400702, 2016YFA0400703), the National Science Foundation of China (11473002, 11721303, 11533001) and China Postdoctoral Science Foundation Grants (2018M630024, 2019T120011). M.F. acknowledges support by the Science and Technology Facilities Council [grant No. ST/P000541/1]. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 757535). This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 757535). This work has been supported by Fondazione Cariplo, grant No. 2018-2329. P.N. acknowledges support from the French Agence Nationale de la Recherche under grant No. ANR-17-CE31-0011-01. Observations obtained with the Hale Telescope at Palomar Observatory were obtained as part of an agreement between the National Astronomical Observatories, Chinese Academy of Sciences, and the California Institute of Technology. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS website is www.sdss.org. SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, the Chilean Participation Group, the French Participation Group, Harvard-Smithsonian Center for Astrophysics, Instituto de Astrofísica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, Lawrence Berkeley National Laboratory, Leibniz Institut für Astrophysik Potsdam (AIP), Max-Planck-Institut für Astronomie (MPIA Heidelberg), Max-Planck-Institut für Astrophysik (MPA Garching), Max-Planck-Institut für Extraterrestrische Physik (MPE), National Astronomical Observatories of China, New Mexico State University, New York University, University of Notre Dame, Observatário Nacional/MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autónoma de México, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University.

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