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

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.

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


Authors

Ravi Joshi

Raghunathan Srianand

Pasquier Noterdaeme

Patrick Petitjean

Marc Rafelski

Ruari Mackenzie

Qiong Li

Zheng Cai

D. Christopher Martin

Siwei Zou

Xue-Bing Wu

Linhua Jiang

Luis C. Ho



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 LLyα = (3.8 ± 0.8) × 1042 erg s−1 , corresponding to a star formation rate of 2 Me yr−1 (considering a lower limit on Lyα escape fraction ~a f esc Ly 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.

Citation

Joshi, R., Fumagalli, M., Srianand, R., Noterdaeme, P., Petitjean, P., Rafelski, M., …Ho, L. C. (2021). Discovery of a Damped Lyα Galaxy at z ∼ 3 toward the Quasar SDSS J011852+040644. Astrophysical Journal, 908(2), Article 129. https://doi.org/10.3847/1538-4357/abd1d5

Journal Article Type Article
Acceptance Date Dec 4, 2020
Online Publication Date Feb 18, 2021
Publication Date 2021-02
Deposit Date Jan 7, 2022
Publicly Available Date Jan 10, 2022
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 908
Issue 2
Article Number 129
DOI https://doi.org/10.3847/1538-4357/abd1d5

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© 2021. The American Astronomical Society. All rights reserved





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