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Evolution of the star formation histories of BLAST galaxies

Dye, Simon, Eales, Stephen Anthony ORCID:, Moncelsi, Lorenzo and Pascale, Enzo ORCID: 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: 17 May 2023 04:17

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