Bulge mass is king: The dominant role of the bulge in determining the fraction of passive galaxies in the sloan digital sky survey

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DOIResolve DOI: http://doi.org/10.1093/mnras/stu594
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TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society
ISSN1365-2966
Volume441
Issue1
Pages599629; # of pages: 31
AbstractWe investigate the origin of galaxy bimodality by quantifying the relative role of intrinsic and environmental drivers to the cessation (or 'quenching') of star formation in over half a million local Sloan Digital Sky Survey galaxies. Our sample contains a wide variety of galaxies at z = 0.02-0.2, with stellar masses of 8 < log(M*/M⊙) < 12, spanning the entire morphological range from pure discs to spheroids, and over four orders of magnitude in local galaxy density and halo mass. We utilize published star formation rates and add to this recent GIM2D photometric and stellar mass bulge + disc decompositions from our group.We find that the passive fraction of galaxies increases steeply with stellar mass, halo mass, and bulge mass, with a less steep dependence on local galaxy density and bulge-to-total stellarmass ratio (B/T). At fixed internal properties, we find that central and satellite galaxies have different passive fraction relationships. For centrals, we conclude that there is less variation in the passive fraction at a fixed bulge mass, than for any other variable, including total stellar mass, halo mass, and B/T. This implies that the quenching mechanism must be most tightly coupled to the bulge.We argue that radio-mode active galactic nucleus feedback offers the most plausible explanation of the observed trends. © 2014 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21272168
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Record identifier4ec6c9cf-6e00-45dc-a6c3-2b54a32f2fd0
Record created2014-07-23
Record modified2016-05-09
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