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The zCOSMOS redshift survey: evolution of the light in bulges and discs since z ~ 0.8

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.

The zCOSMOS redshift survey: evolution of the light in bulges and discs since z ~ 0.8 Thumbnail


Authors

L.A.M. Tasca

L. Tresse

O. Le Fèvre

O. Ilbert

S.J. Lilly

G. Zamorani

C. López-Sanjuan

L.C. Ho

S. Bardelli

A. Cattaneo

O. Cucciati

D. Farrah

A. Iovino

A.M. Koekemoer

C.T. Liu

A. Renzini

Y. Taniguchi

N. Welikala

E. Zucca

C.M. Carollo

T. Contini

J.-P. Kneib

V. Mainieri

M. Scodeggio

M. Bolzonella

A. Bongiorno

K. Caputi

S. de la Torre

P. Franzetti

B. Garilli

L. Guzzo

P. Kampczyk

C. Knobel

K. Kovač

F. Lamareille

J.-F. Le Borgne

V. Le Brun

C. Maier

M. Mignoli

R. Pello

Y. Peng

E. Perez Montero

R.M. Rich

M. Tanaka

D. Vergani

R. Bordoloi

A. Cappi

A. Cimatti

G. Coppa



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 ± 4)% and (74 ± 4)%, respectively. When compared with rest-frame B-band measurements of galaxies in the local Universe in the same mass range (), 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 to earlier types and ultimately into spheroids.

Citation

Tasca, L., Tresse, L., Le Fèvre, O., Ilbert, O., Lilly, S., Zamorani, G., …Coppa, G. (2014). The zCOSMOS redshift survey: evolution of the light in bulges and discs since z ~ 0.8. Astronomy & Astrophysics, 564, Article L12. https://doi.org/10.1051/0004-6361/201423699

Journal Article Type Article
Acceptance Date Mar 13, 2014
Publication Date Apr 9, 2014
Deposit Date Jun 30, 2014
Publicly Available Date Aug 5, 2014
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 564
Article Number L12
DOI https://doi.org/10.1051/0004-6361/201423699
Keywords Galaxies: bulges, Galaxies: evolution, Galaxies: luminosity function, mass function, Galaxies: distances and redshifts, Galaxies: fundamental parameters.

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Copyright Statement
Reproduced with permission from Astronomy & Astrophysics, © ESO, 2014.





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