Velocity dispersions and stellar populations of the most compact and massive early-type galaxies at redshift 1

Jesus Martinez-Manso, Rafael Guzman, Guillermo Barro, Javier Cenarro, Pablo Perez-Gonzalez, Patricia Sanchez-Blazquez, Ignacio Trujillo, Marc Balcells, Nicolas Cardiel, Jesus Gallego, Angela Hempel, Mercedes Prieto

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

We present Gran-Telescopio-Canarias/OSIRIS optical spectra of four of the most compact and massive early-type galaxies (ETGs) in the Groth Strip Survey at redshift z ∼ 1, with effective radii R e = 0.5-2.4kpc and photometric stellar masses M * = (1.2-4) × 10 11 M ·. We find that these galaxies have velocity dispersions σ = 156-236 km s-1. The spectra are well fitted by single stellar population models with approximately 1Gyr of age and solar metallicity. We find that (1) the dynamical masses of these galaxies are systematically smaller by a factor of ∼6 than the published stellar masses using BRIJK photometry, and (2) when estimating stellar masses as 0.7× M dyn, a combination of passive luminosity fading with mass/size growth due to minor mergers can plausibly evolve our objects to match the properties of the local population of ETGs.

Original languageEnglish
Article numberL22
JournalAstrophysical Journal Letters
Volume738
Issue number2
DOIs
Publication statusPublished - 10 Sep 2011

Keywords

  • galaxies: evolution
  • galaxies: formation
  • galaxies: kinematics and dynamics
  • galaxies: structure

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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