1. The zCOSMOS redshift survey : evolution of the light in bulges and discs since z ~ 0.8
- Author
-
Luis C. Ho, O. Le Fevre, H. J. McCracken, P. Franzetti, Anton M. Koekemoer, R. Pello, E. Zucca, A. Cappi, A. Cattaneo, Niraj Welikala, A. Iovino, K. Kovavc, Alvio Renzini, J. F. Le Borgne, R. M. Rich, M. Mignoli, B. Garilli, T. Contini, Yoshiaki Taniguchi, Graziano Coppa, Jean-Paul Kneib, Masaomi Tanaka, C. Lopez-Sanjuan, E. Perez Montero, P. Kampczyk, Vincenzo Mainieri, Andrea Cimatti, F. Lamareille, Richard Massey, Marco Scodeggio, Angela Bongiorno, Rongmon Bordoloi, Y. Peng, L. Tresse, L. A. M. Tasca, C. Knobel, S. Bardelli, Duncan Farrah, Kartik Sheth, Christian Maier, D. Vergani, Michele Moresco, O. Cucciati, S. de la Torre, K. Caputi, C. M. Carollo, M. Bolzonella, Lucia Pozzetti, G. Zamorani, C. T. Liu, D. B. Sanders, Simon J. Lilly, Luigi Guzzo, V. Le Brun, O. Ilbert, Astronomy, Tasca, L.A.M., Tresse, L., Le Fèvre, O., Ilbert, O., Lilly, S.J., Zamorani, G., López-Sanjuan, C., Ho, L.C., Bardelli, S., Cattaneo, A., Cucciati, O., Farrah, D., Iovino, A., Koekemoer, A.M., Liu, C.T., Massey, R., Renzini, A., Taniguchi, Y., Welikala, N., Zucca, E., Carollo, C.M., Contini, T., Kneib, J.-P., Mainieri, V., Scodeggio, M., Bolzonella, M., Bongiorno, A., Caputi, K., De La Torre, S., Franzetti, P., Garilli, B., Guzzo, L., Kampczyk, P., Knobel, C., Kovač, K., Lamareille, F., Le Borgne, J.-F., Le Brun, V., Maier, C., Mignoli, M., Pello, R., Peng, Y., Perez Montero, E., Rich, R.M., Tanaka, M., Vergani, D., Bordoloi, R., Cappi, A., Cimatti, A., Coppa, G., Mccracken, H.J., Moresco, M., Pozzetti, L., Sanders, D., and Sheth, K.
- Subjects
Galaxies: fundamental parameter ,FORMING GALAXY ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,MASS ,fundamental parameters. [Galaxies] ,LUMINOSITY FUNCTIONS ,galaxies: bulges ,STAR-FORMATION RATE ,Luminosity ,ADVANCED CAMERA ,bulges [Galaxies] ,Bulge ,distances and redshifts [Galaxies] ,Galaxies: distances and redshift ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Galaxy Astrophysics ,Physics ,FORMATION HISTORY ,Star formation ,Astronomy and Astrophysics ,galaxies: fundamental parameters ,HUBBLE-SPACE-TELESCOPE ,VLT DEEP SURVEY ,Astronomy and Astrophysic ,Redshift survey ,evolution [Galaxies] ,Astrophysics - Astrophysics of Galaxies ,luminosity function [Galaxies] ,Redshift ,Galaxy ,Stars ,galaxies: luminosity function ,Space and Planetary Science ,mass function ,Astrophysics of Galaxies (astro-ph.GA) ,galaxies: luminosity function, mass function ,Astrophysics::Earth and Planetary Astrophysics ,GALAXY FORMATION ,galaxies: distances and redshifts ,Irregular galaxy ,galaxies: evolution ,Galaxies: bulge ,SURVEY COSMOS - Abstract
We studied the chronology of galactic bulge and disc formation by analysing the relative contributions of these components to the B-band rest-frame luminosity density at different epochs. We present the first estimate of the evolution of the fraction of rest-frame B-band light in galactic bulges and discs since redshift z~0.8. We performed a bulge-to-disc decomposition of HST/ACS images of 3266 galaxies in the zCOSMOS-bright survey with spectroscopic redshifts in the range 0.7 < z < 0.9. We find that the fraction of B-band light in bulges and discs is $(26 \pm 4)%$ and $(74 \pm 4)%$, respectively. When compared with rest-frame B-band measurements of galaxies in the local Universe in the same mass range ($10^{9} M_{\odot}\lessapprox M \lessapprox 10^{11.5} M_{\odot}$), we find that the B-band light in discs decreases by ~30% from z~0.7-0.9 to z~0, while the light from the bulge increases by ~30% over the same period of time. We interpret this evolution as the consequence of star formation and mass assembly processes, as well as morphological transformation, which gradually shift stars formed at half the age of the Universe from star-forming late-type/irregular galaxies toearlier types and ultimately into spheroids., Letter to the Editor, 4 pages, 2 figures, accepted for publication in Astronomy and Astrophysics
- Published
- 2014