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| Title: | Near-Infrared galaxy counts and evolution from the wide-field Alhambra survey |
Authors: | Hornillos, Cristóbal; Moles, Mariano CSIC; Perea, Jaime CSIC ORCID; Castander, Francisco J. CSIC ORCID; Alfaro, Emilio J. CSIC ORCID CVN ; Benítez, Narciso CSIC ORCID; Cerviño, Miguel CSIC ORCID ; Fernández-Soto, Alberto CSIC ORCID CVN ; González Delgado, Rosa M. CSIC ORCID ; Husillos, César CSIC ORCID; Márquez, Isabel CSIC ORCID; Masegosa, Josefa CSIC ORCID ; Olmo, Ascensión del CSIC ORCID; Prada, Francisco CSIC ORCID ; Quintana, José María CSIC; Sánchez, Sebastián F. CSIC ORCID | Keywords: | Cosmology: observations Galaxies: evolution Galaxies: high-redshift Galaxies: photometry Infrared: galaxies Surveys |
Issue Date: | 2009 | Publisher: | American Astronomical Society Institute of Physics Publishing |
Citation: | Astrophysical Journal 696(2): 1554 (2009) | Abstract: | 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. | Description: | arxiv:0902.2403v1 Hornillos, Cristóbal et al. |
Publisher version (URL): | http://dx.doi.org/10.1088/0004-637X/696/2/1554 | URI: | http://hdl.handle.net/10261/42448 | DOI: | 10.1088/0004-637X/696/2/1554 | ISSN: | 0004-637X | E-ISSN: | 1538-4357 |
| Appears in Collections: | (ICE) Artículos (CFMAC-IFF) Artículos (IAA) Artículos (IFCA) Artículos |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| nearAlhambrasurvey.pdf | 3,9 MB | Adobe PDF |  View/Open |
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