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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 |
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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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Data from : The SAMI Galaxy Survey: observing the environmental quenching of star formation in GAMA groups
Schaefer, A. L. (Creator), Croom, S. M. (Creator), Scott, N. (Creator), Brough, S. (Creator), Allen, J. T. (Creator), Bekki, K. (Creator), Bland-Hawthorn, J. (Creator), Bloom, J. V. (Creator), Bryant, J. J. (Creator), Cortese, L. (Creator), Davies, L. (Creator), Federrath, C. (Creator), Fogarty, L. M. R. (Creator), Green, A. W. (Creator), Groves, B. (Creator), Hopkins, A. M. (Creator), Konstantopoulos, I. S. (Creator), López-Sánchez, Á. R. (Creator), Lawrence, J. S. (Creator) & McElroy, R. (Creator), SAO/NASA Astrophysics Data System (ADS), Mar 2019
DOI: 10.1093/mnras/sty3258, https://ui.adsabs.harvard.edu/abs/2019MNRAS.483.2851S/abstract and one more link, https://ui.adsabs.harvard.edu/link_gateway/2019MNRAS.483.2851S/SIMBAD (show fewer)
Dataset
Projects
- 1 Active
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ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions
Kewley, L., Wyithe, S., Sadler, E., Staveley-Smith, L., Glazebrook, K., Jackson, C., Bland-Hawthorn, J., Asplund, M., Power, C. & Driver, S.
1/01/17 → 31/12/23
Project: Research