The SAMI Galaxy Survey: observing the environmental quenching of star formation in GAMA groups
Article
Article Title | The SAMI Galaxy Survey: observing the environmental quenching of star formation in GAMA groups |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Schaefer, A. L., S. M. Croom, 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. and Yi, S. K. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 483 (3), pp. 2851-2870 |
Number of Pages | 20 |
Year | 2019 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/sty3258 |
Web Address (URL) | https://academic.oup.com/mnras/article/483/3/2851/5222676 |
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 1014 M) from the Galaxy And Mass Assembly Survey, we find signatures of environmental quenching in high-mass groups (MG > 1012.5 M). 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 log(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∗ ∼ 1010 M 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 = 1012.5 M, 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. |
Keywords | galaxies: evolution; galaxies: interactions; galaxies: star formation; galaxies: structure; galaxies: groups: general |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510102. Astronomical instrumentation |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Sydney |
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia | |
University of Wisconsin-Madison, United States | |
University of New South Wales | |
Macquarie University | |
University of Western Australia | |
Australian National University | |
Atlassian, Australia | |
Max Planck Institute for Astronomy, Germany | |
University of Toledo, United States | |
NASA Ames Research Center, United States | |
University of St Andrews, United Kingdom | |
University of Melbourne | |
Yonsei University, Korea |
https://research.usq.edu.au/item/z75w3/the-sami-galaxy-survey-observing-the-environmental-quenching-of-star-formation-in-gama-groups
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