Bars in early- and late-type discs in COSMOS
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Date
2010-11
Publication Type
Journal Article
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yes
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Abstract
We investigate the (large-scale) bar fraction in a mass-complete sample of M > 1010.5 M disc galaxies at 0.2 < z < 0.6 in the Cosmological Evolution Survey (COSMOS) field. The fraction of barred discs strongly depends on mass, disc morphology and specific star formation rate (SSFR). At intermediate stellar mass (1010.5 < M < 1011 M) the bar fraction in early-type discs is much higher, at all redshifts, by a factor of 2, than that in late-type discs. This trend is reversed at higher stellar mass (M > 1011 M), where the fraction of bars in early-type discs becomes significantly lower, at all redshifts, than that in late-type discs. The bar fractions for galaxies with low and high SSFRs closely follow those of the morphologically selected early- and late-type populations, respectively. This indicates a close correspondence between morphology and SSFR in disc galaxies at these earlier epochs. Interestingly, the total bar fraction in 1010.5 < M < 1011 M discs is built up by a factor of 2 over the redshift interval explored, while for M > 1011 M discs it remains roughly constant. This indicates that, already by z 0.6, spectral and morphological transformations in the most massive disc galaxies have largely converged to the familiar Hubble sequence that we observe in the local Universe, while for intermediate-mass discs this convergence is ongoing until at least z 0.2. Moreover, these results highlight the importance of employing mass-limited samples for quantifying the evolution of barred galaxies. Finally, the evolution of the barred galaxy populations investigated does not depend on the large-scale environmental density (at least, on the scales which can be probed with the available photometric redshifts).
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published
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Journal / series
Volume
409 (1)
Pages / Article No.
346 - 354
Publisher
Oxford University Press
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Subject
Galaxies: evolution; Galaxies: formation; Galaxies: structure
Organisational unit
03612 - Carollo, Marcella (ehemalig) / Carollo, Marcella (former)
03613 - Lilly, Simon (emeritus) / Lilly, Simon (emeritus)
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher
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Is new version of: http://hdl.handle.net/20.500.11850/72189