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Title: Morphological Segregation in the Surroundings of Cosmic Voids

Abstract

We explore the morphology of galaxies living in the proximity of cosmic voids, using a sample of voids identified in the Sloan Digital Sky Survey Data Release 7. At all stellar masses, void galaxies exhibit morphologies of a later type than galaxies in a control sample, which represent galaxies in an average density environment. We interpret this trend as a pure environmental effect, independent of the mass bias, due to a slower galaxy build-up in the rarefied regions of voids. We confirm previous findings about a clear segregation in galaxy morphology, with galaxies of a later type being found at smaller void-centric distances with respect to the early-type galaxies. We also show, for the first time, that the radius of the void has an impact on the evolutionary history of the galaxies that live within it or in its surroundings. In fact, an enhanced fraction of late-type galaxies is found in the proximity of voids larger than the median void radius. Likewise, an excess of early-type galaxies is observed within or around voids of a smaller size. A significant difference in galaxy properties in voids of different sizes is observed up to 2 R {sub void}, which we define asmore » the region of influence of voids. The significance of this difference is greater than 3 σ for all the volume-complete samples considered here. The fraction of star-forming galaxies shows the same behavior as the late-type galaxies, but no significant difference in stellar mass is observed in the proximity of voids of different sizes.« less

Authors:
;  [1];  [2];  [3]
  1. Laboratoire d’Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), 1290 Sauverny (Switzerland)
  2. Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Versoix (Switzerland)
  3. Centro de Estudios de Física del Cosmos de Aragón (CEFCA), Plaza San Juan 1, E-44001 Teruel (Spain)
Publication Date:
OSTI Identifier:
22654400
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 846; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; DENSITY; ENVIRONMENTAL EFFECTS; EVOLUTION; GALAXIES; MASS; SEGREGATION; SKY; STARS; UNIVERSE

Citation Formats

Ricciardelli, Elena, Tamone, Amelie, Cava, Antonio, and Varela, Jesus, E-mail: elena.ricciardelli@epfl.ch. Morphological Segregation in the Surroundings of Cosmic Voids. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA84AD.
Ricciardelli, Elena, Tamone, Amelie, Cava, Antonio, & Varela, Jesus, E-mail: elena.ricciardelli@epfl.ch. Morphological Segregation in the Surroundings of Cosmic Voids. United States. doi:10.3847/2041-8213/AA84AD.
Ricciardelli, Elena, Tamone, Amelie, Cava, Antonio, and Varela, Jesus, E-mail: elena.ricciardelli@epfl.ch. Fri . "Morphological Segregation in the Surroundings of Cosmic Voids". United States. doi:10.3847/2041-8213/AA84AD.
@article{osti_22654400,
title = {Morphological Segregation in the Surroundings of Cosmic Voids},
author = {Ricciardelli, Elena and Tamone, Amelie and Cava, Antonio and Varela, Jesus, E-mail: elena.ricciardelli@epfl.ch},
abstractNote = {We explore the morphology of galaxies living in the proximity of cosmic voids, using a sample of voids identified in the Sloan Digital Sky Survey Data Release 7. At all stellar masses, void galaxies exhibit morphologies of a later type than galaxies in a control sample, which represent galaxies in an average density environment. We interpret this trend as a pure environmental effect, independent of the mass bias, due to a slower galaxy build-up in the rarefied regions of voids. We confirm previous findings about a clear segregation in galaxy morphology, with galaxies of a later type being found at smaller void-centric distances with respect to the early-type galaxies. We also show, for the first time, that the radius of the void has an impact on the evolutionary history of the galaxies that live within it or in its surroundings. In fact, an enhanced fraction of late-type galaxies is found in the proximity of voids larger than the median void radius. Likewise, an excess of early-type galaxies is observed within or around voids of a smaller size. A significant difference in galaxy properties in voids of different sizes is observed up to 2 R {sub void}, which we define as the region of influence of voids. The significance of this difference is greater than 3 σ for all the volume-complete samples considered here. The fraction of star-forming galaxies shows the same behavior as the late-type galaxies, but no significant difference in stellar mass is observed in the proximity of voids of different sizes.},
doi = {10.3847/2041-8213/AA84AD},
journal = {Astrophysical Journal Letters},
number = 1,
volume = 846,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}