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 o˙ yr-1 (considering a lower limit on Lyα escape fraction ∫escLyα ∼ 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.

Joshi, R., Fumagalli, M., Srianand, R., Noterdaeme, P., Petitjean, P., Rafelski, M., et al. (2021). Discovery of a Damped Lyα Galaxy at z ∼ 3 toward the Quasar SDSS J011852+040644. THE ASTROPHYSICAL JOURNAL, 908(2) [10.3847/1538-4357/abd1d5].

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

Fumagalli M.;
2021

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 o˙ yr-1 (considering a lower limit on Lyα escape fraction ∫escLyα ∼ 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.
Articolo in rivista - Articolo scientifico
absorption line systems
English
18-feb-2021
2021
908
2
129
open
Joshi, R., Fumagalli, M., Srianand, R., Noterdaeme, P., Petitjean, P., Rafelski, M., et al. (2021). Discovery of a Damped Lyα Galaxy at z ∼ 3 toward the Quasar SDSS J011852+040644. THE ASTROPHYSICAL JOURNAL, 908(2) [10.3847/1538-4357/abd1d5].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/335703
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