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Journal Articles The Astrophysical Journal Year : 2017

Galaxy And Mass Assembly (GAMA): A “No Smoking” Zone for Giant Elliptical Galaxies?

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Mojtaba Raouf
  • Function : Author
Halime Miraghaei
  • Function : Author
Sarah Brough
  • Function : Author
Darren J. Croton
  • Function : Author
Simon Driver
  • Function : Author
Alister Graham
  • Function : Author
Ivan Baldry
  • Function : Author
Michael Brown
  • Function : Author
Matt Prescott
  • Function : Author
Lingyu Wang
  • Function : Author

Abstract

We study the radio emission of the most massive galaxies in a sample of dynamically relaxed and unrelaxed galaxy groups from the Galaxy and Mass Assembly survey. The dynamical state of the group is defined by the stellar dominance of the brightest group galaxy (BGG), e.g., the luminosity gap between the two most luminous members, and the offset between the position of the BGG and the luminosity centroid of the group. We find that the radio luminosity of the largest galaxy in the group strongly depends on its environment, such that the BGGs in dynamically young (evolving) groups are an order of magnitude more luminous in the radio than those with a similar stellar mass but residing in dynamically old (relaxed) groups. This observation has been successfully reproduced by a newly developed semi-analytic model that allows us to explore the various causes of these findings. We find that the fraction of radio-loud BGGs in the observed dynamically young groups is ∼2 times that of the dynamically old groups. We discuss the implications of this observational constraint on the central galaxy properties in the context of galaxy mergers and the super massive black hole accretion rate.

Dates and versions

insu-03747465 , version 1 (08-08-2022)

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Habib G. Khosroshahi, Mojtaba Raouf, Halime Miraghaei, Sarah Brough, Darren J. Croton, et al.. Galaxy And Mass Assembly (GAMA): A “No Smoking” Zone for Giant Elliptical Galaxies?. The Astrophysical Journal, 2017, 842, ⟨10.3847/1538-4357/aa7048⟩. ⟨insu-03747465⟩
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