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Title: Prevalence of neutral gas in centres of merging galaxies−II: nuclear H i and multiwavelength properties

Abstract

Abstract Using a sample of 38 radio-loud galaxy mergers at z ≤ 0.2, we confirm the high detection rate (∼84 per cent) of H i 21-cm absorption in mergers, which is significantly higher (∼4 times) than in non-mergers. The distributions of the H i column density [$$N(\rm{H\,{\small I}}$$)] and velocity shift of the absorption with respect to the systemic redshift of the galaxy hosting the radio source in mergers are significantly different from that in non-mergers. We investigate the connection of the nuclear H i gas with various multiwavelength properties of the mergers. While the inferred $$N(\rm{H\,{\small I}}$$) and gas kinematics do not show strong (i.e. ≥3σ level) correlation with galaxy properties, we find that the incidence and $$N(\rm{H\,{\small I}}$$) of absorption tend to be slightly higher at smaller projected separations between the galaxy pairs and among the lower stellar mass-radio galaxies. The incidence, $$N(\rm{H\,{\small I}}$$) and line width of H i absorption increase from the pre-merger to the post-merger stages. The 100 per cent detection rate in post-mergers indicates that the neutral gas in the circumnuclear regions survives the coalescence period and is not yet quenched by the nuclear radio activity.

Authors:
ORCiD logo [1];  [2];  [2]
  1. European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching Near Munich, Germany
  2. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, 411007 Pune, India
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1559097
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 489 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Dutta, R., Srianand, R., and Gupta, N. Prevalence of neutral gas in centres of merging galaxies−II: nuclear H i and multiwavelength properties. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz2178.
Dutta, R., Srianand, R., & Gupta, N. Prevalence of neutral gas in centres of merging galaxies−II: nuclear H i and multiwavelength properties. United Kingdom. doi:10.1093/mnras/stz2178.
Dutta, R., Srianand, R., and Gupta, N. Thu . "Prevalence of neutral gas in centres of merging galaxies−II: nuclear H i and multiwavelength properties". United Kingdom. doi:10.1093/mnras/stz2178.
@article{osti_1559097,
title = {Prevalence of neutral gas in centres of merging galaxies−II: nuclear H i and multiwavelength properties},
author = {Dutta, R. and Srianand, R. and Gupta, N.},
abstractNote = {Abstract Using a sample of 38 radio-loud galaxy mergers at z ≤ 0.2, we confirm the high detection rate (∼84 per cent) of H i 21-cm absorption in mergers, which is significantly higher (∼4 times) than in non-mergers. The distributions of the H i column density [$N(\rm{H\,{\small I}}$)] and velocity shift of the absorption with respect to the systemic redshift of the galaxy hosting the radio source in mergers are significantly different from that in non-mergers. We investigate the connection of the nuclear H i gas with various multiwavelength properties of the mergers. While the inferred $N(\rm{H\,{\small I}}$) and gas kinematics do not show strong (i.e. ≥3σ level) correlation with galaxy properties, we find that the incidence and $N(\rm{H\,{\small I}}$) of absorption tend to be slightly higher at smaller projected separations between the galaxy pairs and among the lower stellar mass-radio galaxies. The incidence, $N(\rm{H\,{\small I}}$) and line width of H i absorption increase from the pre-merger to the post-merger stages. The 100 per cent detection rate in post-mergers indicates that the neutral gas in the circumnuclear regions survives the coalescence period and is not yet quenched by the nuclear radio activity.},
doi = {10.1093/mnras/stz2178},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 489,
place = {United Kingdom},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1093/mnras/stz2178

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