Detalles de publicación
PP 025036
The OTELO survey: New evidence of downsizing from the specific star formation rates, stellar mass functions, and star formation histories of a sample of low-mass galaxies at 0.38
The OTELO survey: New evidence of downsizing from the specific star formation rates, stellar mass functions, and star formation histories of a sample of low-mass galaxies at 0.38
(1) IAC
(2) Departamento de Astrofísica, Universidad de La Laguna (ULL)
(3) Asociación Astrofísica para la Promoción de la Investigación, Instrumentación y su Desarrollo, ASPID,
(4) Institut de Radioastronomie Millimétrique (IRAM)
(5) Fundación Galileo Galilei–INAF,
(6) Astronomical Observatory Institute, Faculty of Physics and Astronomy, Adam Mickiewicz University, ul. Słoneczna
(7) Departamento de Física de la Tierra y Astrofísica, Instituto de Física de Partículas y del Cosmos, IPARCOS. Universidad Complutense de Madrid (UCM)
(8) Instituto de Física de Cantabria (CSIC-Universidad de Cantabria)
(9) Instituto de Astrofísica de Andalucía (CSIC)
(10) Centro de Astrobiología (CSIC/INTA)
(11) Instituto de Astronomía, Universidad Nacional Autónoma de México
(12) ISDEFE for European Space Astronomy Centre (ESAC)/ESA
(13) Space Science and Geospatial Institute (SSGI), Entoto Observatory and Research Center (EORC)
(14) Physics Department, Mbarara University of Science and Technology (MUST),
Aims. We present an analysis of the emitters (Hα, Hβ, and [O ii]) from the OTELO survey, in order to characterize the star formation
properties of low-mass galaxies (< 109 M⊙ stellar masses).
Methods. We calculated the specific star formation rate function, the stellar mass function, and, by integrating them, the associated
densities for both quantities: the specific star formation rate density and the stellar mass density. We obtained the star formation history
of our low-mass sample galaxies by fitting the spectral energy distribution of the galaxies. We also compared our results with those
from the literature at different mass regimes and redshifts.
Results. The specific star formation rate density and the stellar mass density for low-mass galaxies do not depend on the redshift,
contrary to the behaviour presented by the high-mass galaxies. We found that the star formation histories of low-mass galaxies are
characterized by a constant star formation rate, in contrast to high-mass galaxies. We interpret these results, in the context of the
downsizing effect, as representative of the faster evolution of massive galaxies compared with low-mass ones.
(1) IAC
(2) Departamento de Astrofísica, Universidad de La Laguna (ULL)
(3) Asociación Astrofísica para la Promoción de la Investigación, Instrumentación y su Desarrollo, ASPID,
(4) Institut de Radioastronomie Millimétrique (IRAM)
(5) Fundación Galileo Galilei–INAF,
(6) Astronomical Observatory Institute, Faculty of Physics and Astronomy, Adam Mickiewicz University, ul. Słoneczna
(7) Departamento de Física de la Tierra y Astrofísica, Instituto de Física de Partículas y del Cosmos, IPARCOS. Universidad Complutense de Madrid (UCM)
(8) Instituto de Física de Cantabria (CSIC-Universidad de Cantabria)
(9) Instituto de Astrofísica de Andalucía (CSIC)
(10) Centro de Astrobiología (CSIC/INTA)
(11) Instituto de Astronomía, Universidad Nacional Autónoma de México
(12) ISDEFE for European Space Astronomy Centre (ESAC)/ESA
(13) Space Science and Geospatial Institute (SSGI), Entoto Observatory and Research Center (EORC)
(14) Physics Department, Mbarara University of Science and Technology (MUST),
Aims. We present an analysis of the emitters (Hα, Hβ, and [O ii]) from the OTELO survey, in order to characterize the star formation
properties of low-mass galaxies (< 109 M⊙ stellar masses).
Methods. We calculated the specific star formation rate function, the stellar mass function, and, by integrating them, the associated
densities for both quantities: the specific star formation rate density and the stellar mass density. We obtained the star formation history
of our low-mass sample galaxies by fitting the spectral energy distribution of the galaxies. We also compared our results with those
from the literature at different mass regimes and redshifts.
Results. The specific star formation rate density and the stellar mass density for low-mass galaxies do not depend on the redshift,
contrary to the behaviour presented by the high-mass galaxies. We found that the star formation histories of low-mass galaxies are
characterized by a constant star formation rate, in contrast to high-mass galaxies. We interpret these results, in the context of the
downsizing effect, as representative of the faster evolution of massive galaxies compared with low-mass ones.
properties of low-mass galaxies (< 109 M⊙ stellar masses).
Methods. We calculated the specific star formation rate function, the stellar mass function, and, by integrating them, the associated
densities for both quantities: the specific star formation rate density and the stellar mass density. We obtained the star formation history
of our low-mass sample galaxies by fitting the spectral energy distribution of the galaxies. We also compared our results with those
from the literature at different mass regimes and redshifts.
Results. The specific star formation rate density and the stellar mass density for low-mass galaxies do not depend on the redshift,
contrary to the behaviour presented by the high-mass galaxies. We found that the star formation histories of low-mass galaxies are
characterized by a constant star formation rate, in contrast to high-mass galaxies. We interpret these results, in the context of the
downsizing effect, as representative of the faster evolution of massive galaxies compared with low-mass ones.