Bibcode
DOI
Pérez-González, Pablo G.; Trujillo, I.; Barro, Guillermo; Gallego, Jesús; Zamorano, Jaime; Conselice, Christopher J.
Referencia bibliográfica
The Astrophysical Journal, Volume 687, Issue 1, pp. 50-58.
Advertised on:
11
2008
Revista
Número de citas
68
Número de citas referidas
59
Descripción
We use Spitzer MIPS data from the FIDEL Legacy Project in the extended
Groth strip to analyze the stellar mass assembly of massive
(M>1011 Msolar) galaxies at z<2 as a
function of structural parameters. We find 24 μm emission for more
than 85% of the massive galaxies morphologically classified as disks,
and for more than 57% of the massive systems morphologically classified
as spheroids at any redshift, with about 8% of sources harboring a
bright X-ray- and/or infrared-emitting AGN. More noticeably, ~60% of all
compact massive galaxies at z=1-2 are detected at 24 μm, even when
rest-frame optical colors reveal that they are dead and evolving
passively. For spheroid-like galaxies at a given stellar mass, the sizes
of MIPS nondetections are smaller by a factor of ~1.2 in comparison with
IR-bright sources. We find that disklike massive galaxies present
specific SFRs ranging from 0.04 to 0.2 Gyr-1 at z<1 (SFRs
ranging from 1 to 10 Msolar yr-1), typically a
factor of 3-6 higher than massive spheroid-like objects in the same
redshift range. At z>1, and more pronouncedly at z>1.3, the median
specific SFRs of the disks and spheroids detected by MIPS are very
similar, ranging from 0.1 to 1 Gyr-1 (SFR=10-200
Msolar yr-1). We estimate that massive
spheroid-like galaxies may have doubled (at the most) their stellar mass
from star-forming events at z<2: less than 20% mass increase at
1.7
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