The specific entropy of elliptical galaxies: an explanation for profile-shape distance indicators?
نویسندگان
چکیده
منابع مشابه
Is the shape of the luminosity profile of dwarf elliptical galaxies an useful distance indicator?
The shape of the surface brightness profile of dE galaxies, quantified by parameter n of Sérsic’s generalized profile law, has recently been put forward as new extragalactic distance indicator (Young & Currie 1994). Its application to the Virgo cluster has subsequently led to the claim that the Virgo dEs are not lying in the cluster core but are distributed in a prolate structure stretching fro...
متن کاملIs the shape of the luminosity profile of dwarf elliptical galaxies a useful distance indicator?
The shape of the surface brightness profile of dE galaxies, quantified by parameter n of Sérsic’s generalized profile law, has recently been put forward as new extragalactic distance indicator (Young & Currie 1994). Its application to the Virgo cluster has subsequently led to the claim that the Virgo dEs are not lying in the cluster core but are distributed in a prolate structure stretching fro...
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The luminosities of the centers of nearby elliptical galaxies are very low compared to models of thin disc accretion to their black holes at the Bondi rate, typically a few hundredths to a few tenths of a solar mass per year. This has motivated models of inefficiently-radiated accretion that invoke weak electron-ion thermal coupling, and/or inhibited accretion rates due to convection or outflow...
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Models of chemical evolution of elliptical galaxies taking into account different escape velocities at different galactocentric radii are presented. As a consequence of this, the chemical evolution develops differently in different galactic regions; in particular, we find that the galactic wind, powered by supernovae (of type II and I) starts, under suitable conditions, in the outer regions and...
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As part of a research program exploring how and why dwarf elliptical (dE) galaxies depart from the Fundamental Plane defined by luminous elliptical (E) galaxies, we have analyzed archival Hubble Space Telescope F606W images of a sample of 18 dE galaxy candidates in the Coma Cluster. We model the full radial extent of their light-profiles by simultaneously fitting a PSFconvolved Sérsic R model a...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1999
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.1999.02849.x