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 Rvoid, which we define as the region of influence of voids. The significance of this difference is greater than 3sigma 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.
Galaxy interactions in void substructures: Morphology and stellar populations of two triplets from CAVITY
Universidad de Granada（格拉纳达大学）；Universidade Federal do Rio Grande do Sul (UFRGS)（南里奥格兰德联邦大学）；Universidade Federal do Rio Grande (IMEF – FURG)（里奥格兰德联邦大学）；University of Hertfordshire（赫特福德大学）
Chemodynamic evidence of pristine gas accretion in the void galaxy VGS 12
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg（海德堡大学天文学计算研究所）；Special Astrophysical Observatory, Russian Academy of Sciences（俄罗斯科学院特别天文台）；Lomonosov Moscow State University, Sternberg Astronomical Institute（莫斯科罗蒙诺索夫国立大学斯登伯格天文研究所）；Instituto de Astronomía, Universidad Nacional Autónoma de México（墨西哥国立自治大学天文研究所）；Kapteyn Astronomical Institute, University of Groningen（格罗宁根大学卡普坦天文研究所）；Department of Astronomy, Columbia University（哥伦比亚大学天文学系）
