The ALHAMBRA survey: reliable morphological catalogue of 22,051 early-
  and late-type galaxies
  ALHAMBRA is a photometric survey designed to trace the cosmic evolution and
cosmic variance. It covers a large area of ~ 4 sq. deg in 8 fields, where 7
fields overlap with other surveys, allowing 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%. Of those, 1,640 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 dataset
is especially attractive given the homogeneous multi-wavelength coverage
available in the ALHAMBRA fields, and is intended to be used in a variety of
scientific applications. The low-contamination catalogue (< 10%) is made
publicly available with the present paper.
