Quintana, J. M.; Prada, F.; Pérez-García, A. M.; Oteo, I.; Matute, I.; Martínez, V. J.; López-Sanjuan, C.; Infante, L.; Delgado, R. M. González; Cerviño, M.; Fernandez Lorenzo, M.; Cepa, J.; Castander, F. J.; Cabrera-Caño, J.; Broadhurst, T.; Ascaso, B.; Aparicio-Villegas, T.; Alfaro, E.; Moles, M.; Jiménez-Teja, Y.; Fernández-Soto, A.; Olmo, A. del; Benítez, N.; Perea, J.; Cristóbal-Hornillos, D.; Molino, A.; Husillos, C.; Masegosa, J.; Márquez, I.; Aguerri, J. A. L.; Huertas-Company, M.; Pović, M.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 435, Issue 4, p.3444-3461
Description
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 ˜4 deg2
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 (˜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 ˜0.5) and late-type (down to redshifts
˜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.
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