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http://hdl.handle.net/20.500.12386/30801
Titolo: | Evidence for H I replenishment in massive galaxies through gas accretion from the cosmic web | Autori: | KLEINER, DANE Pimbblet, Kevin A. Jones, D. Heath Koribalski, Bärbel S. SERRA, PAOLO |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 466 | Fascicolo: | 4 | Da pagina:: | 4692 | 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 and the Discrete Persistent Structures Extractor to define the filamentary structure of the local cosmic web. H I spectral stacking of H I Parkes all sky survey observations yields the H I fraction for filament galaxies and a field control sample. The H I fraction is measured for different stellar masses and fifth nearest neighbour projected densities (Σ<SUB>5</SUB>) to disentangle what influences cold gas in galaxies. For galaxies with stellar masses log(M<SUB>⋆</SUB>) ≤ 11 M<SUB>☉</SUB> in projected densities 0 ≤ Σ<SUB>5</SUB> < 3 galaxies Mpc<SUP>-2</SUP>, all H I fractions of galaxies near filaments are statistically indistinguishable from the control sample. Galaxies with stellar masses log(M<SUB>⋆</SUB>) ≥ 11 M<SUB>☉</SUB> 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<SUP>-2</SUP>. We suggest that this is evidence for massive galaxies accreting cold gas from the intrafilament medium that 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. | URI: | http://hdl.handle.net/20.500.12386/30801 | URL: | https://academic.oup.com/mnras/article/466/4/4692/2733859 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw3328 | Bibcode ADS: | 2017MNRAS.466.4692K | Fulltext: | open |
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