2024-03-28T18:29:03Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/424482021-10-28T15:40:37Zcom_10261_45com_10261_4com_10261_14181com_10261_97com_10261_37col_10261_298col_10261_14182col_10261_350col_10261_290
00925njm 22002777a 4500
dc
Hornillos, Cristóbal
author
Moles, Mariano
author
Perea, Jaime
author
Castander, Francisco J.
author
Alfaro, Emilio J.
author
Benítez, Narciso
author
Cerviño, Miguel
author
Fernández-Soto, Alberto
author
González Delgado, Rosa M.
author
Husillos, César
author
Márquez, Isabel
author
Masegosa, Josefa
author
Olmo, Ascensión del
author
Prada, Francisco
author
Quintana, José María
author
Sánchez, Sebastián F.
author
2009
The ALHAMBRA survey aims to cover 4 deg2 using a system of 20 contiguous, equal width, medium-band filters spanning the range 3500 Å-9700 Å plus the standard JHKs filters. Here we analyze deep near-IR number counts of one of our fields (ALH08) for which we have a relatively large area (0.5 deg2) and faint photometry (J = 22.4, H = 21.3, and K = 20.0 at the 50% of recovery efficiency for point-like sources). We find that the logarithmic gradient of the galaxy counts undergoes a distinct change to a flatter slope in each band: from 0.44 at [17.0, 18.5] to 0.34 at [19.5, 22.0] for the J band; for the H band 0.46 at [15.5, 18.0] to 0.36 at [19.0, 21.0], and in Ks the change is from 0.53 in the range [15.0, 17.0] to 0.33 in the interval [18.0, 20.0]. These observations together with faint optical counts are used to constrain models that include density and luminosity evolution of the local type-dependent luminosity functions. Our models imply a decline in the space density of evolved early-type galaxies with increasing redshift, such that only 30%-50% of the bulk of the present day red ellipticals was already in place at z~1.
Astrophysical Journal 696(2): 1554 (2009)
0004-637X
http://hdl.handle.net/10261/42448
10.1088/0004-637X/696/2/1554
1538-4357
Cosmology: observations
Galaxies: evolution
Galaxies: high-redshift
Galaxies: photometry
Infrared: galaxies
Surveys
Near-Infrared galaxy counts and evolution from the wide-field Alhambra survey