Galaxy And Mass Assembly (GAMA): The group H i mass as a function of halo mass

Ajay Dev, Simon P. Driver, Martin Meyer, Sambit Roychowdhury, Jonghwan Rhee, Adam R.H. Stevens, Claudia Del P. Lagos, Joss Bland-Hawthorn, Barbara Catinella, A. M. Hopkins, Jonathan Loveday, Danail Obreschkow, Steven Phillipps, Aaron S.G. Robotham

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We determine the atomic hydrogen (H i) to halo mass relation (HIHM) using Arecibo Legacy Fast ALFA survey H i data at the location of optically selected groups from the Galaxy And Mass Assembly (GAMA) survey. We make direct H i detections for 37 GAMA groups. Using H i group spectral stacking of 345 groups, we study the group H i content as a function of halo mass across a halo mass range of 1011-1014.7 M⊙. We also correct our results for Eddington bias. We find that the group H i mass generally rises as a function of halo mass from 1.3% of the halo mass at to 0.4% at with some indication of flattening towards the high-mass end. Despite the differences in optical survey limits, group catalogues, and halo mass estimation methods, our results are consistent with previous group H i-stacking studies. Our results are also consistent with mock observations from shark and IllustrisTNG.

Original languageEnglish
Pages (from-to)2693-2709
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 1 Aug 2023


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