NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-11-15 T21:48:50 PST
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For refcode 2014MNRAS.440..843O:
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NED Abstract

Copyright by Royal Astronomical Society. 2014MNRAS.440..843O The connection between galaxy structure and quenching efficiency Omand, Conor M. B.; Balogh, Michael L.; Poggianti, Bianca M. Abstract. 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 R_e_, 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 R_e_. The dependence is particularly strong as a function of M_*/R_e^{alpha}, with {alpha} ~ 1.5. This appears to be driven by a simple dependence on B/T over the mass range 9 < log (M_*_/M_sun_) < 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_*_, R_e_ and B/T. The quenching efficiency is not constant, but reaches a maximum of ~0.7 for galaxies with 9 < log (M_*_/M_sun_) < 9.5 and R_e_ < 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 R_e_ due to an increase in dominance of a bulge component. Key words: galaxies: evolution, galaxies: structure
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Please click here for ADS abstract

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