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The Large-scale Effect of Environment on Galactic Conformity

Sun, S.; Guo, Q.; Wang, L.; Wang, J.; Gao, L.; Lacey, C.G.; Pan, J.

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Authors

S. Sun

Q. Guo

L. Wang

J. Wang

L. Gao

J. Pan



Abstract

We use a volume-limited galaxy sample from the Sloan Digital Sky Survey Data Release 7 to explore the dependence of galactic conformity on the large-scale environment, measured on ∼4 Mpc scales. We find that the star formation activity of neighbour galaxies depends more strongly on the environment than on the activity of their primary galaxies. In underdense regions most neighbour galaxies tend to be active, while in overdense regions neighbour galaxies are mostly passive, regardless of the activity of their primary galaxies. At a given stellar mass, passive primary galaxies reside in higher density regions than active primary galaxies, leading to the apparently strong conformity signal. The dependence of the activity of neighbour galaxies on environment can be explained by the corresponding dependence of the fraction of satellite galaxies. Similar results are found for galaxies in a semi-analytical model, suggesting that no new physics is required to explain the observed large-scale conformity.

Citation

Sun, S., Guo, Q., Wang, L., Wang, J., Gao, L., Lacey, C., & Pan, J. (2018). The Large-scale Effect of Environment on Galactic Conformity. Monthly Notices of the Royal Astronomical Society, 477(3), 3136-3144. https://doi.org/10.1093/mnras/sty832

Journal Article Type Article
Acceptance Date Mar 28, 2018
Online Publication Date Apr 4, 2018
Publication Date Jul 1, 2018
Deposit Date May 16, 2018
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 477
Issue 3
Pages 3136-3144
DOI https://doi.org/10.1093/mnras/sty832

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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