The XXL Survey. XXXVII. The role of the environment in shaping the stellar population properties of galaxies at 0.1
2019
Exploiting a sample of
galaxiesdrawn from the XXL-N multiwavelength survey, we present an analysis of the
stellar populationproperties of
galaxiesat 0.1
galaxyfractions and the star formation rate (SFR)-
stellar mass(M) relation. Furthermore, we exploit and compare two parametrisations of environment. When adopting a definition of "global" environment, we consider separately cluster virial/outer members and
field galaxies. When considering the "local" environment, we take into account the projected number density of
galaxiesin a fixed aperture of 1Mpc in the sky. We find that regardless of the environmental definition adopted, the fraction of blue/star-forming
galaxiesis the highest in the field/least dense regions and the lowest in the virial regions of clusters/highest densities. Furthermore, the fraction of star-forming
galaxiesis higher than the fraction of blue
galaxies, regardless of the environment. This result is particularly evident in the virial cluster regions, most likely reflecting the different star formation histories of
galaxiesin different environments. Also the overall SFR-M relation does not seem to depend on the parametrisation adopted. Nonetheless, the two definitions of environment lead to different results as far as the fraction of
galaxiesin transition between the star-forming
main sequenceand the quenched regime is concerned. In fact, using the local environment the fraction of
galaxiesbelow the
main sequenceis similar at low and high densities, whereas in clusters (and especially within the virial radii) a population with reduced SFR with respect to the field is observed. Our results show that the two parametrisations adopted to describe the environment have different physical meanings, i.e.are intrinsically related to different physical processes acting on
galaxypopulations and are able to probe different physical scales.
Keywords:
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Correction
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2019
Exploiting a sample of
galaxiesdrawn from the XXL-N multiwavelength survey, we present an analysis of the
stellar populationproperties of
galaxiesat 0.1
galaxyfractions and the star formation rate (SFR)-
stellar mass(M) relation. Furthermore, we exploit and compare two parametrisations of environment. When adopting a definition of "global" environment, we consider separately cluster virial/outer members and
field galaxies. When considering the "local" environment, we take into account the projected number density of
galaxiesin a fixed aperture of 1Mpc in the sky. We find that regardless of the environmental definition adopted, the fraction of blue/star-forming
galaxiesis the highest in the field/least dense regions and the lowest in the virial regions of clusters/highest densities. Furthermore, the fraction of star-forming
galaxiesis higher than the fraction of blue
galaxies, regardless of the environment. This result is particularly evident in the virial cluster regions, most likely reflecting the different star formation histories of
galaxiesin different environments. Also the overall SFR-M relation does not seem to depend on the parametrisation adopted. Nonetheless, the two definitions of environment lead to different results as far as the fraction of
galaxiesin transition between the star-forming
main sequenceand the quenched regime is concerned. In fact, using the local environment the fraction of
galaxiesbelow the
main sequenceis similar at low and high densities, whereas in clusters (and especially within the virial radii) a population with reduced SFR with respect to the field is observed. Our results show that the two parametrisations adopted to describe the environment have different physical meanings, i.e.are intrinsically related to different physical processes acting on
galaxypopulations and are able to probe different physical scales.
Keywords:
-
Correction
-
Source
-
Cite
-
Save
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