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Galaxy And Mass Assembly (GAMA): Linking star formation histories and stellar mass growth

Bauer, Amanda E.; Hopkins, Andrew M.; Gunawardhana, Madusha; Taylor, Edward N.; Baldry, Ivan; Bamford, Steven P.; Bland-Hawthorn, Joss; Brough, Sarah; Brown, Michael J. I.; Cluver, Michelle E.; Colless, Matthew; Conselice, Christopher J.; Croom, Scott; Driver, Simon; Foster, Caroline; Jones, D. Heath; Lara-Lopez, Maritza A.; Liske, Jochen; López-Sánchez, Ángel R.; Loveday, Jon; Norberg, Peder; Owers, Matt S.; Pimbblet, Kevin; Robotham, Aaron; Sansom, Anne E.; Sharp, Rob

Authors

Amanda E. Bauer

Andrew M. Hopkins

Madusha Gunawardhana

Edward N. Taylor

Ivan Baldry

Steven P. Bamford

Joss Bland-Hawthorn

Sarah Brough

Michael J. I. Brown

Michelle E. Cluver

Matthew Colless

Christopher J. Conselice

Scott Croom

Simon Driver

Caroline Foster

D. Heath Jones

Maritza A. Lara-Lopez

Jochen Liske

Ángel R. López-Sánchez

Jon Loveday

Peder Norberg

Matt S. Owers

Aaron Robotham

Anne E. Sansom

Rob Sharp



Abstract

WWe present evidence for stochastic star formation histories in low-mass (M * < 10 10 M ⊙ ) galaxies from observations within the Galaxy And Mass Assembly (GAMA) survey. For ̃73 000 galaxies between 0.05 < z < 0.32, we calculate star formation rates (SFR) and specific star formation rates (SSFR = SFR/M * ) from spectroscopic Hα measurements and apply dust corrections derived from Balmer decrements. We find a dependence of SSFR on stellar mass, such that SSFRs decrease with increasing stellar mass for star-forming galaxies, and for the full sample, SSFRs decrease as a stronger function of stellar mass. We use simple parametrizations of exponentially declining star formation histories to investigate the dependence on stellar mass of the star formation time-scale and the formation redshift. We find that parametrizations previously fit to samples of z ̃ 1 galaxies cannot recover the distributions of SSFRs and stellar masses observed in the GAMA sample between 0.05 < z < 0.32. In particular, a large number of low-mass (M * < 10 10 M ⊙ ) galaxies are observed to have much higher SSFRs than can be explained by these simple models over the redshift range of 0.05 < z < 0.32, even when invoking mass-dependent staged evolution. For such a large number of galaxies to maintain low stellar masses, yet harbour such high SSFRs, requires the late onset of a weak underlying exponentially declining star formation history with stochastic bursts of star formation superimposed. ©2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Journal Article Type Article
Publication Date Sep 1, 2013
Journal Monthly notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 434
Issue 1
Pages 209-221
APA6 Citation Bauer, A. E., Hopkins, A. M., Gunawardhana, M., Taylor, E. N., Baldry, I., Bamford, S. P., …Sharp, R. (2013). Galaxy And Mass Assembly (GAMA): Linking star formation histories and stellar mass growth. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 434(1), 209-221. https://doi.org/10.1093/mnras/stt1011
DOI https://doi.org/10.1093/mnras/stt1011
Keywords Galaxies: evolution; Galaxies: formation; Galaxies: general; Galaxies: starburst; Galaxies: star formation; Galaxies: stellar content
Publisher URL https://academic.oup.com/mnras/article/434/1/209/993396
Copyright Statement ©2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

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Copyright Statement
©2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society



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