Galaxy and Mass Assembly (GAMA): Impact of the Group Environment on Galaxy Star Formation

S. Barsanti; 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

doi:10.3847/1538-4357/aab61a

Galaxy and Mass Assembly (GAMA): Impact of the Group Environment on Galaxy Star Formation

S. Barsanti^*, 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

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

39 Citations (Scopus)

1 Downloads (Pure)

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.

Original language	English
Article number	71
Number of pages	18
Journal	Astrophysical Journal
Volume	857
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aab61a
Publication status	Published - 16 Apr 2018

Keywords

Galaxies: evolution
Galaxies: groups: general
Galaxies: kinematics and dynamics
Galaxies: star formation

Access to Document

10.3847/1538-4357/aab61a

Barsanti_2018_AJ_Groupenvironment_AAM
© 2018. The American Astronomical Society. All rights reserved. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/1538-4357/aab61a
Accepted author manuscript, 3.2 MB

Cite this

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. (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

@article{9dc391aaf47b4df4ba31b37b0843f2ae,

title = "Galaxy and Mass Assembly (GAMA): Impact of the Group Environment on Galaxy Star Formation",

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.",

keywords = "Galaxies: evolution, Galaxies: groups: general, Galaxies: kinematics and dynamics, Galaxies: star formation",

author = "S. Barsanti and Owers, {M. S.} and S. Brough and Davies, {L. J. M.} and Driver, {S. P.} and Gunawardhana, {M. L. P.} and Holwerda, {B. W.} and J. Liske and J. Loveday and Pimbblet, {K. A.} and Robotham, {A. S. G.} and Taylor, {E. N.}",

note = "MSO acknowledges the funding support from the Australian Research Council through a Future Fellowship (FT140100255). SB acknowledges funding support from the Australian Research Council through a Future Fellowship (FT140101166).",

year = "2018",

month = apr,

day = "16",

doi = "10.3847/1538-4357/aab61a",

language = "English",

volume = "857",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

TY - JOUR

T1 - Galaxy and Mass Assembly (GAMA)

T2 - Impact of the Group Environment on Galaxy Star Formation

AU - Barsanti, S.

AU - Owers, M. S.

AU - Brough, S.

AU - Davies, L. J. M.

AU - Driver, S. P.

AU - Gunawardhana, M. L. P.

AU - Holwerda, B. W.

AU - Liske, J.

AU - Loveday, J.

AU - Pimbblet, K. A.

AU - Robotham, A. S. G.

AU - Taylor, E. N.

N1 - MSO acknowledges the funding support from the Australian Research Council through a Future Fellowship (FT140100255). SB acknowledges funding support from the Australian Research Council through a Future Fellowship (FT140101166).

PY - 2018/4/16

Y1 - 2018/4/16

N2 - 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.

AB - 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.

KW - Galaxies: evolution

KW - Galaxies: groups: general

KW - Galaxies: kinematics and dynamics

KW - Galaxies: star formation

UR - https://arxiv.org/abs/1803.05076

U2 - 10.3847/1538-4357/aab61a

DO - 10.3847/1538-4357/aab61a

M3 - Article

SN - 0004-637X

VL - 857

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 71

ER -

Galaxy and Mass Assembly (GAMA): Impact of the Group Environment on Galaxy Star Formation

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this