Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 504, Issue 2, Pages 3058-3073Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab1064
Keywords
galaxies: bulges; galaxies: evolution; galaxies: formation; galaxies: structure
Categories
Funding
- Spanish Ministerio de Economia y Competitividad (MINECO) [AYA2017-83204-P]
- Programa Operativo FEDER Andalucia 2014-2020
- Andalucian Office for Economy and Knowledge
- European Regional Development Fund (ERDF)
- ConaCyt [CB-285080]
- Spanish Ministry of Science [ICTS-2009-10]
- Centro Astronomico Hispano-Aleman
- PAPIIT [IN100519]
- Spanish Ministry of Economy and Competitiveness (MINECO) [AYA201677237-C3-1-P, RTI2018-096188-B-I00]
- [FC-2016-01-1916]
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The study reveals differences in the mass-size relation between bulges and discs in high-mass galaxies, as well as a correlation between the Sersic index of bulges and both galaxy and bulge mass. The results support an inside-out formation of nearby non-barred galaxies and suggest that early properties of bulges influence the future evolution of the galaxy.
This series of papers aims at understanding the formation and evolution of non-barred disc galaxies. We use the new spectro-photometric decomposition code, C2D, to separate the spectral information of bulges and discs of a statistically representative sample of galaxies from the CALIFA survey. Then, we study their stellar population properties analysing the structure-independent datacubes with the PIPE3D algorithm. We find a correlation between the bulge-to-total (B/T) luminosity (and mass) ratio and galaxy stellar mass. The B/T mass ratio has only a mild evolution with redshift, but the bulge-to-disc (B/D) mass ratio shows a clear increase of the disc component since redshift z < 1 for massive galaxies. The mass-size relation for both bulges and discs describes an upturn at high galaxy stellar masses (log(M-star/M-circle dot) > 10.5). The relation holds for bulges but not for discs when using their individual stellar masses. We find a negligible evolution of the mass-size relation for both the most massive (log(M-star,M-b,M-d/M-circle dot) > 10) bulges and discs. For lower masses, discs show a larger variation than bulges. We also find a correlation between the Sersic index of bulges and both galaxy and bulge stellar mass, which does not hold for the disc mass. Our results support an inside-out formation of nearby non-barred galaxies, and they suggest that (i) bulges formed early-on and (ii) they have not evolved much through cosmic time. However, we find that the early properties of bulges drive the future evolution of the galaxy as a whole, and particularly the properties of the discs that eventually form around them.
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