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Evolution of the star formation histories of BLAST galaxies

Dye, Simon, Eales, Stephen Anthony, Moncelsi, Lorenzo and Pascale, Enzo 2010. Evolution of the star formation histories of BLAST galaxies. Monthly Notices of the Royal Astronomical Society: Letters 407 (1) , L69-L73. 10.1111/j.1745-3933.2010.00907.x

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We have measured star formation histories (SFHs) and stellar masses of galaxies detected by the Balloon-borne Large Aperture Submillimetre Telescope (BLAST) over ∼9 deg2 centred on the Chandra Deep Field-South. We have applied the recently developed SFH reconstruction method of Dye et al. to optical, near-infrared and mid-infrared photometry of 92 BLAST galaxies. We find significant differences between the SFHs of low-mass (≲1011 M⊙) and high-mass (≳1011 M⊙) systems. On average, low-mass systems exhibit a dominant late burst of star formation which creates a large fraction of their stellar mass. Conversely, high-mass systems tend to have a significant amount of stellar mass that formed much earlier. We also find that the high-mass SFHs evolve more strongly than the low-mass SFHs. These findings are consistent with the phenomenon of downsizing observed in optically selected samples of galaxies.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies: evolution; galaxies: star formation; submillimetre: galaxies
Additional Information: Pdf uploaded in accordance with publisher's policy at (accessed 20/02/2014).
Publisher: Royal Astronomical Society
ISSN: 17453925
Date of First Compliant Deposit: 30 March 2016
Last Modified: 06 Dec 2017 22:24

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