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Galaxy and mass assembly (GAMA): impact of the group environment on galaxy star formation

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journal contribution
posted on 2023-06-19, 09:44 authored by S Barsanti, M S Owers, S Brough, L J M Davies, S P Driver, M L P Gunawardhana, B W Holwerda, J Liske, Jonathan LovedayJonathan Loveday, K A Pimbblet, A S G Robotham, E N Taylor
We explore how the group environment may affect the evolution of star-forming galaxies. We select 1197 Galaxy And Mass Assembly (GAMA) groups at 0.05=z=0.2 and analyze the projected phase space (PPS) diagram, i.e. the galaxy velocity as a function of projected group-centric radius, as a local environmental metric in the low-mass halo regime 10 12 =(M200/M?)<10^14. We study the properties of star-forming group galaxies, exploring the correlation of star formation rate (SFR) with radial distance and stellar mass. We find that the fraction of star-forming group members is higher in the PPS regions dominated by recently accreted galaxies, whereas passive galaxies dominate the virialized regions. We observe a small decline in specific SFR of star-forming galaxies towards the group center by a factor ~1.2 with respect to field galaxies. Similar to cluster studies, we conclude for low-mass halos that star-forming group galaxies represent an infalling population from the field to the halo and show suppressed star formation.

History

Publication status

  • Published

File Version

  • Published version

Journal

Astrophysical Journal

ISSN

0004-637X

Publisher

Institute of Physics

Issue

71

Volume

857

Page range

1-18

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-03-19

First Open Access (FOA) Date

2018-04-26

First Compliant Deposit (FCD) Date

2018-03-16

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