Velocity Dispersions and Stellar Populations of the Most Compact and Massive Early-type Galaxies at Redshift ~1

Bibcode
2011ApJ...738L..22M
DOI
10.1088/2041-8205/738/2/L22
Martinez-Manso, Jesus; Guzman, Rafael; Barro, Guillermo; Cenarro, Javier; Perez-Gonzalez, Pablo; Sanchez-Blazquez, Patricia; Trujillo, I.; Balcells, M.; Cardiel, Nicolas; Gallego, Jesus; Hempel, A.; Prieto, M.
Bibliographical reference

The Astrophysical Journal Letters, Volume 738, Issue 2, article id. L22 (2011).

Advertised on:
9
2011
Number of authors
12
IAC number of authors
4
Citations
29
Refereed citations
28
Description
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 = 0.5-2.4 kpc and photometric stellar masses M sstarf = (1.2-4) × 1011 M sun. 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 1 Gyr 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.
Related projects
Group members
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology
We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.
Ignacio
Martín Navarro
In progress
Type
Refereed
Galaxies

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