S. Barsanti
Galaxy and Mass Assembly (GAMA): Impact of the Group Environment on Galaxy Star Formation
Barsanti, S.; Owers, M.S.; Brough, S.; Davies, L.J.M.; Driver, S.P.; Gunawardhana, M.L.P.; Holwerda, B.W.; Liske, J.; Loveday, J.; Pimbblet, K.A.; Robotham, A.S.G.; Taylor, E.N.
Authors
M.S. Owers
S. Brough
L.J.M. Davies
S.P. Driver
M.L.P. Gunawardhana
B.W. Holwerda
J. Liske
J. Loveday
K.A. Pimbblet
A.S.G. Robotham
E.N. Taylor
Abstract
We explore how the group environment may affect the evolution of star-forming galaxies. We select 1197 Galaxy And Mass Assembly 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 1012 ≤ (M 200/M ⊙) < 1014. 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 toward 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.
Citation
Barsanti, S., Owers, M., Brough, S., Davies, L., Driver, S., Gunawardhana, M., …Taylor, E. (2018). Galaxy and Mass Assembly (GAMA): Impact of the Group Environment on Galaxy Star Formation. Astrophysical Journal, 857(1), Article 71. https://doi.org/10.3847/1538-4357/aab61a
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 9, 2018 |
Online Publication Date | Apr 16, 2018 |
Publication Date | Apr 16, 2018 |
Deposit Date | Apr 26, 2018 |
Publicly Available Date | Apr 26, 2018 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 857 |
Issue | 1 |
Article Number | 71 |
DOI | https://doi.org/10.3847/1538-4357/aab61a |
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Copyright Statement
© 2018. The American Astronomical Society. All rights reserved.
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