H2 molecular gas absorption-selected systems trace CO molecular gas-rich galaxy overdensities

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  • stab1668

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  • Klitsch, Anne
  • Céline Péroux
  • Martin A. Zwaan
  • Annalisa De Cia
  • Cédric Ledoux
  • Sebastian Lopez
Absorption-selected galaxies offer an effective way to study low-mass galaxies at high redshift. However, the physical properties of the underlying galaxy population remain uncertain. In particular, the multiphase circumgalactic medium is thought to hold key information on gas flows into and out of galaxies that are vital for galaxy evolution models. Here, we present ALMA observations of CO molecular gas in host galaxies of H2-bearing absorbers. In our sample of six absorbers, we detect molecular gas-rich galaxies in five absorber fields, although we did not target high-metallicity (>50 per cent solar) systems for which previous studies reported the highest detection rate. Surprisingly, we find that the majority of the absorbers are associated with multiple galaxies rather than single haloes. Together with the large impact parameters, these results suggest that the H2-bearing gas seen in absorption is not part of an extended disc, but resides in dense gas pockets in the circumgalactic and intragroup medium....
OriginalsprogEngelsk
TidsskriftMonthly Notices of the Royal Astronomical Society
Vol/bind506
Udgave nummer1
Sider (fra-til)514-522
Antal sider9
ISSN0035-8711
DOI
StatusUdgivet - 1 sep. 2021

ID: 280890300