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Characterizing the satellites of massive galaxies up to z ∼ 2: young populations to build the outskirts of nearby massive galaxies

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Mármol Queraltó, E. and Trujillo, I. and Villar, V. and Barro, G. and Pérez González, Pablo Guillermo (2013) Characterizing the satellites of massive galaxies up to z ∼ 2: young populations to build the outskirts of nearby massive galaxies. Monthly notices of the Royal Astronomical Society, 429 (1). pp. 792-798. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1093/mnras/sts374




Abstract

The accretion of minor satellites is currently proposed as the most likely mechanism to explain the significant size evolution of the massive galaxies during the last ∼10 Gyr. In this paper, we investigate the rest-frame colours and the average stellar ages of satellites found around massive galaxies (M_star ∼ 10^11 M_⊙) since z ∼ 2. We find that the satellites have bluer colours than their central galaxies. When exploring the stellar ages of the galaxies, we find that the satellites have similar ages to the massive galaxies that host them at high redshifts, while at lower redshifts they are, on average, ≳1.5 Gyr younger. If our satellite galaxies create the envelope of nearby massive galaxies, our results would be compatible with the idea that the outskirts of those galaxies are slightly younger, metal-poorer and with lower [α/Fe] abundance ratios than their inner regions.


Item Type:Article
Additional Information:

© 2012 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
We thank the anonymous referee for a constructive reading of the manuscript that helped us to improve the quality of the paper. Authors are grateful to Alexandre Vazdekis, Elena Ricciardelli and Ignacio Ferreras for fruitful discussions. This work has been supported by the 'Programa Nacional de Astronomía y Astrofísica' of the Spanish Ministry of Science and Innovation under grant AYA2010-21322-C03-02. PGP-G, GB and VV acknowledge support from the Spanish Programa Nacional de Astronomía y Astrofísica under grants AYA2009-10368, AYA2009-07723-E and CSD2006-00070. This work has made use of the Rainbow Cosmological Surveys Database, which is operated by the Universidad Complutense de Madrid (UCM).

Uncontrolled Keywords:Star-forming galaxies; Spectral energy-distributions; Ultra-deep-field; Size evolution; Luminosity function; Elliptic galaxies; Redshift survey; Metallicity gradients; Spatial-distribution; Spitzer/Irac sources
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:38421
Deposited On:06 Jul 2016 16:48
Last Modified:10 Dec 2018 15:05

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