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2014MNRAS.440..843O - Mon. Not. R. Astron. Soc., 440, 843-858 (2014/May-1)

The connection between galaxy structure and quenching efficiency.


Abstract (from CDS):

Using data from the Sloan Digital Sky Survey (SDSS)-DR7, including structural measurements from 2D surface brightness fits with gim2d, we show how the fraction of quiescent galaxies depends on galaxy stellar mass M*, effective radius Re, fraction of r-band light in the bulge, B/T, and their status as a central or satellite galaxy at 0.01 < z < 0.2. For central galaxies we confirm that the quiescent fraction depends not only on stellar mass, but also on Re. The dependence is particularly strong as a function of M_*/R_e^α, with α ∼ 1.5. This appears to be driven by a simple dependence on B/T over the mass range 9 < log(M*/M) < 11.5, and is qualitatively similar even if galaxies with B/T > 0.3 are excluded. For satellite galaxies, the quiescent fraction is always larger than that of central galaxies, for any combination of M*, Re and B/T. The quenching efficiency is not constant, but reaches a maximum of ∼ 0.7 for galaxies with 9 < log(M*/M) < 9.5 and Re < 1 kpc. This is the same region of parameter space in which the satellite fraction itself reaches its maximum value, suggesting that the transformation from an active central galaxy to a quiescent satellite is associated with a reduction in Re due to an increase in dominance of a bulge component.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: evolution - galaxies: structure

VizieR on-line data: <Available at CDS (J/MNRAS/440/843): table1.dat>

Status in Simbad:  will not be processed

Simbad objects: 1

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