The evolution of early and late type galaxies in the COSMOS up to z~1.2 - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




The evolution of early and late type galaxies in the COSMOS up to z~1.2 - Astrophysics > Cosmology and Nongalactic Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The Cosmic Evolution Survey COSMOS allows for the first time a highlysignificant census of environments and structures up to redshift one, as wellas a full morphological description of the galaxy population. In this paper wepresent a study aimed to constrain the evolution, in the redshift range 0.2 < z< 1.2, of the mass content of different morphological types and its dependenceon the environmental density. We use a deep multicolor catalog, covering anarea of ~0.7 square degrees inside the COSMOS field, with accurate photometricredshifts i < 26.5 and dz-z+1 ~ 0.035. We estimate galaxy stellar masses byfitting the multi-color photometry to a grid of composite stellar populationmodels. We quantitatively describe the galaxy morphology by fitting PSFconvolved Sersic profiles to the galaxy surface brightness distributions downto F814 = 24 mag for a sample of 41300 objects.We confirm an evolution of the morphological mix with redshift: the higherthe redshift the more disk-dominated galaxies become important. We find thatthe morphological mix is a function of the local comoving density: themorphology density relation extends up to the highest redshift explored.The stellar mass function of disk-dominated galaxies is consistent with beingconstant with redshift. Conversely, the stellar mass function ofbulge-dominated systems shows a decline in normalization with redshift. Suchdifferent behaviors of late-types and early-types stellar mass functionsnaturally set the redshift evolution of the transition mass. ABRIDGED



Autor: Maurilio Pannella NRAO, Armin Gabasch ESO, Yuliana Goranova IAP, Niv Drory MPE, Ulrich Hopp USM-MPE, Stefan Noll OAMP, Roberto P.

Fuente: https://arxiv.org/



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