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Evidence for HI replenishment in massive galaxies through gas accretion from the cosmic web

Kleiner, Dane; Pimbblet, Kevin A.; Jones, D. Heath; Koribalski, Bärbel S.; Serra, Paolo

Abstract

We examine the H i -to-stellar mass ratio (H i fraction) for galaxies near filament backbones within the nearby Universe (d < 181 Mpc). This work uses the 6 degree Field Galaxy Survey (6dFGS) and the Discrete Persistent Structures Extractor (DisPerSE) to define the filamentary structure of the local cosmic web. H i spectral stacking of H i Parkes All Sky Survey (HIPASS) observations yield the H i fraction for filament galaxies and a field control sample. The H i fraction is measured for different stellar masses and 5th nearest neighbour projected densities (Σ5) to disentangle what influences cold gas in galaxies. For galaxies with stellar masses log(M⋆) ≤ 11 M⊙ in projected densities 0 ≤ Σ5 < 3 galaxies Mpc−2, all H i fractions of galaxies near filaments are statistically indistinguishable from the control sample. Galaxies with stellar masses log(M⋆) ≥ 11 M⊙ have a systematically higher H i fraction near filaments than the control sample. The greatest difference is 0.75 dex, which is 5.5σ difference at mean projected densities of 1.45 galaxies Mpc−2. We suggest that this is evidence for massive galaxies accreting cold gas from the intra-filament medium which can replenish some H i gas. This supports cold mode accretion where filament galaxies with a large gravitational potential can draw gas from the large scale structure.

Journal Article Type Article
Publication Date May 1, 2017
Journal Monthly notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 466
Issue 4
Pages 4692-4710
DOI https://doi.org/10.1093/mnras/stw3328
Keywords Galaxies : evolution; Galaxies : general; Large-scale structure of Universe; Radio lines : galaxies
Publisher URL https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw3328
Additional Information This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2017 Dane Kleiner, Kevin A. Pimbblet, D. Heath Jones, Bärbel S. Koribalski, Paolo Serra; Evidence for H i replenishment in massive galaxies through gas accretion from the cosmic web. Mon Not R Astron Soc 2017; 466 (4): 4692-4710. doi: 10.1093/mnras/stw3328. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Copyright Statement
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society



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