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RISS 인기검색어
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- 저자 : Diemer, Benedikt (검색결과 1 건)
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Revisiting the Bulge-Halo Conspiracy. I. Dependence on Galaxy Properties and Halo Mass
Shankar, Francesco,Sonnenfeld, Alessandro,Mamon, Gary A.,Chae, Kyu-Hyun,Gavazzi, Raphael,Treu, Tommaso,Diemer, Benedikt,Nipoti, Carlo,Buchan, Stewart,Bernardi, Mariangela,Sheth, Ravi,Huertas-Company, American Astronomical Society 2017 The Astrophysical Journal Vol.840 No.1
<P>We carry out a systematic investigation of the total mass density profile of massive (log M-star / M-circle dot greater than or similar to 11.3) early-type galaxies and its dependence on galactic properties and host halo mass with the aid of a variety of lensing/dynamical data and large mock galaxy catalogs. The latter are produced via semi-empirical models that, by design, are based on just a few basic input assumptions. Galaxies. with measured stellar masses, effective radii, and Sersic indices, are assigned, via abundance matching relations, host dark matter halos characterized by a typical Lambda CDM profile. Our main results are as follows. (1) In line with observational evidence, our semi-empirical models naturally predict that the total, mass-weighted density slope at the effective radius gamma' is not universal, steepening for more compact and/or massive galaxies, but flattening with increasing host halo mass. (2) Models characterized by a Salpeter or variable initial mass function (IMF) and uncontracted dark matter profiles are in good agreement with the data, while a Chabrier IMF and/or adiabatic contractions/expansions of the dark matter halos are highly disfavored. (3) Currently available data on the mass density profiles of very massive galaxies (log M-star / M-circle dot greater than or similar to 12), with M-halo greater than or similar to 3 x 10(14) M-circle dot, favor instead models with a stellar profile flatter than a Sersic one in the very inner regions (r less than or similar to 3-5 kpc), and a cored NFW or Einasto dark matter profile with median halo concentration a factor of similar to 2 or less than or similar to 1.3, respectively, higher than those typically predicted by N-body numerical simulations.</P>
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