Bibcode
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
Citations
29
Refereed citations
27
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
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