Cameron, E. and Carollo, C. M. and Oesch, P. and Aller, M. C. and Bschorr, T. and Cerulo, P. and Aussel, H. and Capak, P. and Le Floc'h, E. and Ilbert, O. and Kneib, J.-P. and Koekemoer, A. and Leauthaud, A. and Lilly, S. J. and Massey, R. and McCracken, H. J. and Rhodes, J. and Salvato, M. and Sanders, D. B. and Scoville, N. and Sheth, K. and Taniguchi, Y. and Thompson, D. (2010) Bars in early- and late-type discs in COSMOS. Monthly Notices of the Royal Astronomical Society, 409 (1). pp. 346-354. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20110106-100103588
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We investigate the (large-scale) bar fraction in a mass-complete sample of M > 10^(10.5) 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 (10^(10.5) < M < 10^(11) 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 > 10^(11) 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 10^(10.5) < M < 10^(11) M_⊙ discs is built up by a factor of ~2 over the redshift interval explored, while for M > 10^(11) 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).
|Additional Information:||© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 July 6; Received 2010 July 6; in original form 2010 January 11. Article first published online: 30 Aug. 2010.|
|Subject Keywords:||galaxies: evolution; galaxies: formation; galaxies: structure|
|Official Citation:||Cameron, E., Carollo, C. M., Oesch, P., Aller, M. C., Bschorr, T., Cerulo, P., Aussel, H., Capak, P., Le Floc'h, E., Ilbert, O., Kneib, J.-P., Koekemoer, A., Leauthaud, A., Lilly, S. J., Massey, R., McCracken, H. J., Rhodes, J., Salvato, M., Sanders, D. B., Scoville, N., Sheth, K., Taniguchi, Y. and Thompson, D. (2010), Bars in early- and late-type discs in COSMOS. Monthly Notices of the Royal Astronomical Society, 409: 346–354. doi: 10.1111/j.1365-2966.2010.17314.x|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||06 Jan 2011 20:35|
|Last Modified:||26 Dec 2012 12:49|
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