The formation epoch of ellipticals and other red-sequence galaxies

Details The formation epoch of ellipticals and other red-sequence galaxies The formation epoch of ellipticals and other red-sequence galaxies

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007rmxac..29..126b&link_type=abstract

First Light Science with the GTC (Eds. R. Guzmán, C. Packham, J. M. Rodríguez-Espinosa, & S. Torres-Peimbert) Revista Mexicana d

Astronomy and Astrophysics

Astronomy

2

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Evolution, Galaxies: Formation

Scientific paper

As part of the preparatory work for the upcoming GOYA Survey with GTC/EMIR, the GOYA team obtained deep galaxy number counts in the U, B and K bands, for the Groth strip. We present number count models that simultaneously explain the counts in the three bands. We find that most of the precursors of today's early-type galaxies (ellipticals, S0) must have formed at redshifts more recent than z = 2, with z = 1.5 providing a good match to the data. The constraint arises from the observed slope change that occurs in the NIR counts at K ˜ 17.5. With EMIR on GTC, we expect to map the rest-frame optical continuum of early-type galaxies to z ˜ 1.5, and their emission lines to z ˜ 2.6, to obtain key properties of early-type galaxies and their precursors at the key epoch when they stopped making stars.

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