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

Dutta, R.; Srianand, R.; Gupta, N.

doi:10.1093/mnras/stz2178

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

Journal Article · 07 August 2019 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stz2178 · OSTI ID:1559097

^[1]; Srianand, R. ^[2]; Gupta, N. ^[2]

European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching Near Munich, Germany
Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, 411007 Pune, India

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.

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Sponsoring Organization:: USDOE

OSTI ID:: 1559097

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 489; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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