QUENCHING OF STAR FORMATION IN SLOAN DIGITAL SKY SURVEY GROUPS: CENTRALS, SATELLITES, AND GALACTIC CONFORMITY

Knobel, Christian; Lilly, Simon J.; Woo, Joanna; Kovač, Katarina

doi:10.1088/0004-637X/800/1/24

Title: QUENCHING OF STAR FORMATION IN SLOAN DIGITAL SKY SURVEY GROUPS: CENTRALS, SATELLITES, AND GALACTIC CONFORMITY

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Abstract

We re-examine the fraction of low-redshift Sloan Digital Sky Survey satellites and centrals in which star formation has been quenched, using the environment quenching efficiency formalism that separates out the dependence of stellar mass. We show that the centrals of the groups containing the satellites are responding to the environment in the same way as their satellites (at least for stellar masses above 10{sup 10.3} M {sub ☉}), and that the well-known differences between satellites and the general set of centrals arise because the latter are overwhelmingly dominated by isolated galaxies. The widespread concept of ''satellite quenching'' as the cause of environmental effects in the galaxy population can therefore be generalized to ''group quenching''. We then explore the dependence of the quenching efficiency of satellites on overdensity, group-centric distance, halo mass, the stellar mass of the satellite, and the stellar mass and specific star formation rate (sSFR) of its central, trying to isolate the effect of these often interdependent variables. We emphasize the importance of the central sSFR in the quenching efficiency of the associated satellites, and develop the meaning of this ''galactic conformity'' effect in a probabilistic description of the quenching of galaxies. We show that conformity is strong,more »« less

Authors:

Knobel, Christian; Lilly, Simon J.; Woo, Joanna; Kovač, Katarina ^[1]

Institute for Astronomy, ETH Zurich, CH-8093 Zurich (Switzerland)

Publication Date:: Tue Feb 10 00:00:00 EST 2015

OSTI Identifier:: 22364241

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 800; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; EFFICIENCY; GALAXIES; MASS; PROBABILISTIC ESTIMATION; RED SHIFT; SATELLITES; SPACE; STAR EVOLUTION; STARS

Citation Formats


                    Knobel, Christian, Lilly, Simon J., Woo, Joanna, and Kovač, Katarina. QUENCHING OF STAR FORMATION IN SLOAN DIGITAL SKY SURVEY GROUPS: CENTRALS, SATELLITES, AND GALACTIC CONFORMITY.  United States: N. p., 2015. 
        Web.  doi:10.1088/0004-637X/800/1/24.

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                    Knobel, Christian, Lilly, Simon J., Woo, Joanna, & Kovač, Katarina. QUENCHING OF STAR FORMATION IN SLOAN DIGITAL SKY SURVEY GROUPS: CENTRALS, SATELLITES, AND GALACTIC CONFORMITY.  United States.  https://doi.org/10.1088/0004-637X/800/1/24

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                    Knobel, Christian, Lilly, Simon J., Woo, Joanna, and Kovač, Katarina. 2015.  
        "QUENCHING OF STAR FORMATION IN SLOAN DIGITAL SKY SURVEY GROUPS: CENTRALS, SATELLITES, AND GALACTIC CONFORMITY".  United States.  https://doi.org/10.1088/0004-637X/800/1/24.

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@article{osti_22364241,

  title        = {QUENCHING OF STAR FORMATION IN SLOAN DIGITAL SKY SURVEY GROUPS: CENTRALS, SATELLITES, AND GALACTIC CONFORMITY},

  author       = {Knobel, Christian and Lilly, Simon J. and Woo, Joanna and Kovač, Katarina},

  abstractNote = {We re-examine the fraction of low-redshift Sloan Digital Sky Survey satellites and centrals in which star formation has been quenched, using the environment quenching efficiency formalism that separates out the dependence of stellar mass. We show that the centrals of the groups containing the satellites are responding to the environment in the same way as their satellites (at least for stellar masses above 10{sup 10.3} M {sub ☉}), and that the well-known differences between satellites and the general set of centrals arise because the latter are overwhelmingly dominated by isolated galaxies. The widespread concept of ''satellite quenching'' as the cause of environmental effects in the galaxy population can therefore be generalized to ''group quenching''. We then explore the dependence of the quenching efficiency of satellites on overdensity, group-centric distance, halo mass, the stellar mass of the satellite, and the stellar mass and specific star formation rate (sSFR) of its central, trying to isolate the effect of these often interdependent variables. We emphasize the importance of the central sSFR in the quenching efficiency of the associated satellites, and develop the meaning of this ''galactic conformity'' effect in a probabilistic description of the quenching of galaxies. We show that conformity is strong, and that it varies strongly across parameter space. Several arguments then suggest that environmental quenching and mass quenching may be different manifestations of the same underlying process. The marked difference in the apparent mass dependencies of environment quenching and mass quenching which produces distinctive signatures in the mass functions of centrals and satellites will arise naturally, since, for satellites at least, the distributions of the environmental variables that we investigate in this work are essentially independent of the stellar mass of the satellite.},

  doi          = {10.1088/0004-637X/800/1/24},

  url          = {https://www.osti.gov/biblio/22364241},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 1,

  volume       = 800,

  place        = {United States},

  year         = {Tue Feb 10 00:00:00 EST 2015},

  month        = {Tue Feb 10 00:00:00 EST 2015}

}

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