Abstract
We explore the radial distribution of star formation in galaxies in the SAMI Galaxy Survey as a function of their Local Group environment. Using a sample of galaxies in groups (with halo masses less than ≃ 1014M⊙) from the Galaxy And Mass Assembly Survey, we find signatures of environmental quenching in high-mass groups (MG ≥ 1012.5M⊙). The mean integrated specific star formation rate (sSFR) of star-forming galaxies in high-mass groups is lower than for galaxies in low-mass groups or those that are ungrouped, with Δlog(sSFR/yr-1) = 0.45 ± 0.07. This difference is seen at all galaxy stellar masses. In high-mass groups, starforming galaxies more massive than M∗ ∼ 1010M⊙ have centrally concentrated star formation. These galaxies also lie below the star formation main sequence, which suggests they may be undergoing outside-in quenching. Lower mass galaxies in high-mass groups do not show evidence of concentrated star formation. In groups less massive than MG = 1012.5M⊙, we do not observe these trends. In this regime, we find a modest correlation between centrally concentrated star formation and an enhancement in the total star formation rate, consistent with triggered star formation in these galaxies.
| Original language | English |
|---|---|
| Pages (from-to) | 2851-2870 |
| Number of pages | 20 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 483 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Jan 2019 |
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The SAMI Galaxy Survey : Observing the environmental quenching of star formation in GAMA groups. / Schaefer, A. L.; Croom, S. M.; Scott, N.; Brough, S.; Allen, J. T.; Bekki, K.; Bland-Hawthorn, J.; Bloom, J. V.; Bryant, J. J.; Cortese, L.; Davies, L. J.M.; Federrath, C.; Fogarty, L. M.R.; Green, A. W.; Groves, B.; Hopkins, A. M.; Konstantopoulos, I. S.; López-Sánchez, A. R.; Lawrence, J. S.; McElroy, R. E.; Medling, A. M.; Owers, M. S.; Pracy, M. B.; Richards, S. N.; Robotham, A. S.G.; Van De Sande, J.; Tonini, C.; Yi, S. K.
In: Monthly Notices of the Royal Astronomical Society, Vol. 483, No. 3, 01.01.2019, p. 2851-2870.Research output: Contribution to journal › Review article
TY - JOUR
T1 - The SAMI Galaxy Survey
T2 - Observing the environmental quenching of star formation in GAMA groups
AU - Schaefer, A. L.
AU - Croom, S. M.
AU - Scott, N.
AU - Brough, S.
AU - Allen, J. T.
AU - Bekki, K.
AU - Bland-Hawthorn, J.
AU - Bloom, J. V.
AU - Bryant, J. J.
AU - Cortese, L.
AU - Davies, L. J.M.
AU - Federrath, C.
AU - Fogarty, L. M.R.
AU - Green, A. W.
AU - Groves, B.
AU - Hopkins, A. M.
AU - Konstantopoulos, I. S.
AU - López-Sánchez, A. R.
AU - Lawrence, J. S.
AU - McElroy, R. E.
AU - Medling, A. M.
AU - Owers, M. S.
AU - Pracy, M. B.
AU - Richards, S. N.
AU - Robotham, A. S.G.
AU - Van De Sande, J.
AU - Tonini, C.
AU - Yi, S. K.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - We explore the radial distribution of star formation in galaxies in the SAMI Galaxy Survey as a function of their Local Group environment. Using a sample of galaxies in groups (with halo masses less than ≃ 1014M⊙) from the Galaxy And Mass Assembly Survey, we find signatures of environmental quenching in high-mass groups (MG ≥ 1012.5M⊙). The mean integrated specific star formation rate (sSFR) of star-forming galaxies in high-mass groups is lower than for galaxies in low-mass groups or those that are ungrouped, with Δlog(sSFR/yr-1) = 0.45 ± 0.07. This difference is seen at all galaxy stellar masses. In high-mass groups, starforming galaxies more massive than M∗ ∼ 1010M⊙ have centrally concentrated star formation. These galaxies also lie below the star formation main sequence, which suggests they may be undergoing outside-in quenching. Lower mass galaxies in high-mass groups do not show evidence of concentrated star formation. In groups less massive than MG = 1012.5M⊙, we do not observe these trends. In this regime, we find a modest correlation between centrally concentrated star formation and an enhancement in the total star formation rate, consistent with triggered star formation in these galaxies.
AB - We explore the radial distribution of star formation in galaxies in the SAMI Galaxy Survey as a function of their Local Group environment. Using a sample of galaxies in groups (with halo masses less than ≃ 1014M⊙) from the Galaxy And Mass Assembly Survey, we find signatures of environmental quenching in high-mass groups (MG ≥ 1012.5M⊙). The mean integrated specific star formation rate (sSFR) of star-forming galaxies in high-mass groups is lower than for galaxies in low-mass groups or those that are ungrouped, with Δlog(sSFR/yr-1) = 0.45 ± 0.07. This difference is seen at all galaxy stellar masses. In high-mass groups, starforming galaxies more massive than M∗ ∼ 1010M⊙ have centrally concentrated star formation. These galaxies also lie below the star formation main sequence, which suggests they may be undergoing outside-in quenching. Lower mass galaxies in high-mass groups do not show evidence of concentrated star formation. In groups less massive than MG = 1012.5M⊙, we do not observe these trends. In this regime, we find a modest correlation between centrally concentrated star formation and an enhancement in the total star formation rate, consistent with triggered star formation in these galaxies.
KW - Galaxies: evolution
KW - Galaxies: groups: general
KW - Galaxies: interactions
KW - Galaxies: star formation
KW - Galaxies: structure
UR - http://www.scopus.com/inward/record.url?scp=85063587208&partnerID=8YFLogxK
U2 - 10.1093/mnras/sty3258
DO - 10.1093/mnras/sty3258
M3 - Review article
VL - 483
SP - 2851
EP - 2870
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 3
ER -