The ALHAMBRA survey: reliable morphological catalogue of 22 051 early- and late-type galaxies

M. Povic*, M. Huertas-Company, J. A. L. Aguerri, I. Marquez, J. Masegosa, C. Husillos, A. Molino, D. Cristobal-Hornillos, J. Perea, N. Benitez, A. del Olmo, A. Fernandez-Soto, Y. Jimenez-Teja, M. Moles, E. Alfaro, T. Aparicio-Villegas, B. Ascaso, T. Broadhurst, J. Cabrera-Cano, F. J. CastanderJ. Cepa, M. Fernandez Lorenzo, M. Cervino, R. M. Gonzalez Delgado, L. Infante, C. Lopez-Sanjuan, V. J. Martinez, I. Matute, I. Oteo, A. M. Perez-Garcia, F. Prada, J. M. Quintana

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Advanced Large Homogeneous Area Medium Band Redshift Astronomical (ALHAMBRA) is photometric survey designed to trace the cosmic evolution and cosmic variance. It covers a large area of similar to 4 deg(2) in eight fields, where seven fields overlap with other surveys, allowing us to have complementary data in other wavelengths. All observations were carried out in 20 continuous, medium band (30 nm width) optical and 3 near-infrared (JHK) bands, providing the precise measurements of photometric redshifts. In addition, morphological classification of galaxies is crucial for any kind of galaxy formation and cosmic evolution studies, providing the information about star formation histories, their environment and interactions, internal perturbations, etc. We present a morphological classification of > 40 000 galaxies in the ALHAMBRA survey. We associate to every galaxy a probability to be early type using the automated Bayesian code galsvm. Despite of the spatial resolution of the ALHAMBRA images (similar to 1 arcsec), for 22 051 galaxies, we obtained the contamination by other type of less than 10 per cent. Of those, 1640 and 10 322 galaxies are classified as early- (down to redshifts similar to 0.5) and late-type (down to redshifts similar to 1.0), respectively, with magnitudes F613W <22.0. In addition, for magnitude range 22.0 <F613W <23.0, we classified other 10 089 late-type galaxies with redshifts <1.3. We show that the classified objects populate the expected regions in the colour-mass and colour-magnitude planes. The presented data set is especially attractive given the homogeneous multiwavelength coverage available in the ALHAMBRA fields, and is intended to be used in a variety of scientific applications. The low-contamination catalogue (<10 per cent) is made publicly available with this paper.

Original languageEnglish
Pages (from-to)3444-3461
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume435
Issue number4
DOIs
Publication statusPublished - Nov 2013

Keywords

  • surveys
  • galaxies: fundamental parameters
  • galaxies: statistics
  • DIGITAL-SKY-SURVEY
  • HIGH-REDSHIFT GALAXIES
  • SUPPORT VECTOR MACHINES
  • COSMIC EVOLUTION SURVEY
  • SEEING LIMITED IMAGES
  • STRUCTURAL PARAMETERS
  • DATA RELEASE
  • SHAPELET DECOMPOSITION
  • INFRARED PROPERTIES
  • DISTANT GALAXIES

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