Constraints on the evolutionary mechanisms of massive galaxies since z ~ 1 from their velocity dispersions
Entity
UAM. Departamento de Física TeóricaPublisher
Oxford University PressDate
2015-01-01Citation
10.1093/mnras/stv1579
Monthly Notices of the Royal Astronomical Society 453.1 (2015): 704-720
ISSN
0035-8711 (print); 1365-2966 (online)DOI
10.1093/mnras/stv1579Funded by
LPdA was partially supported by the FPI Program by Spanish Ministry of Science and Innovation. JFB acknowledges the support from the FP7 Marie Curie Actions of the European Commission, via the Initial Training Network DAGAL under REA grant agreement number 289313. This work has been supported by the Programa Nacional de Astronomía y Astrofísica of the Spanish Ministry of Science and Innovation under the grants AYA2009-11137, AYA2012-30717, AYA2012-31277 and AYA2013-48226-C3-1-PProject
info:eu-repo/grantAgreement/EC/FP7/289313; Gobierno de España. AYA2009-11137; Gobierno de España. AYA2012-30717; Gobierno de España. AYA2012-31277; Gobierno de España. AYA2013-48226-C3-1-PEditor's Version
http://dx.doi.org/10.1093/mnras/stv1579Subjects
Galaxies: elliptical and lenticular; Galaxies: evolution; Galaxies: fundamental parameters; Galaxies: high-redshift; Galaxies: kinematics and dynamics; Galaxies: structure; FísicaNote
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 RAS. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reservedRights
© 2015 RASAbstract
Several authors have reported that the dynamical masses of massive compact galaxies (M⋆ ≥ 1011 M⊙, re ~ 1 kpc), computed as Mdyn = 5.0 σ2e re/G, are lower than their stellar masses M⋆. In a previous study from our group, the discrepancy is interpreted as a breakdown of
the assumption of homology that underlie the Mdyn determinations. Here, we present new spectroscopy of six redshift z ≈ 1.0 massive compact ellipticals from the Extended Groth Strip, obtained with the 10.4 m Gran Telescopio Canarias. We obtain velocity dispersions
in the range 161–340 km s−1. As found by previous studies of massive compact galaxies, our velocity dispersions are lower than the virial expectation, and all of our galaxies show Mdyn < M⋆ (assuming a Salpeter initial mass function). Adding data from the literature, we build a sample covering a range of stellar masses and compactness in a narrow redshift range z ≈ 1.0 . This allows us to exclude systematic effects on the data and evolutionary effects on the galaxy population, which could have affected previous studies.We confirm that mass discrepancy scales with galaxy compactness. We use the stellar mass plane (M⋆, σe, re) populated by our sample to constrain a generic evolution mechanism. We find that the simulations of the growth of massive ellipticals due to mergers agree with our constraints and
discard the assumption of homology
Files in this item
Google Scholar:Peralta de Arriba, L.
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Balcells, M.
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Trujillo, I.
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Falcón-Barroso, J.
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Tapia, T.
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Cardiel, N.
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Gallego, J.
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Guzmán, R.
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Hempel, A.
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Martín-Navarro, I.
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Pérez-González, Pablo G.
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Sánchez-Blázquez, Patricia
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