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@Article{TortoraLaNaRoFeCa:2014:SyVaCe,
               author = "Tortora, C. and La Barbera, F. and Napolitano, N. R. and 
                         Romanowsky, A. J. and Ferreras, I. and Carvalho, Reinaldo Ramos 
                         de",
          affiliation = "INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello, 
                         16Napoli, Italy and INAF-Osservatorio Astronomico di Capodimonte, 
                         Salita Moiariello, 16Napoli, Italy and INAF-Osservatorio 
                         Astronomico di Capodimonte, Salita Moiariello, 16Napoli, Italy and 
                         Department of Physics and Astronomy, San Jos{\'e} State 
                         UniversitySan Jose, CA, United States; University of California 
                         Observatories, 1156 High StreetSanta Cruz, CA, United States and 
                         Mullard Space Science Laboratory, University College London, 
                         Holmbury St Mary, DorkingSurrey, United Kingdom and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Systematic variations of central mass density slopes in early-type 
                         galaxies",
              journal = "Monthly Notices of the Royal Astronomical Society",
                 year = "2014",
               volume = "445",
               number = "1",
                pages = "115--127",
             keywords = "elliptical, lenticular, cD, galaxies, evolution.",
             abstract = "We study the total density distribution in the central regions 
                         (<~1 effective radius, Re) of earlytype galaxies (ETGs), using 
                         data from SPIDER and ATLAS3D. Our analysis extends the range of 
                         galaxy stellar mass (M*) probed by gravitational lensing, down to 
                         ~10^10M. We model each galaxy with two components (dark matter 
                         halo + stars), exploring different assumptions for the dark matter 
                         halo profile (i.e. NFW, NFW-contracted, and Burkert profiles), and 
                         leaving stellar mass-to-light (M*/L) ratios as free fitting 
                         parameters to the data. For all plausible halo models, the 
                         best-fitting M*/L, normalized to that for a Chabrier initial mass 
                         function, increases systematically with galaxy size and mass. For 
                         anNFWprofile, the slope of the total mass profile is 
                         non-universal, independently of several ingredients in the 
                         modelling (e.g. halo contraction, anisotropy, and rotation 
                         velocity in ETGs). For the most massive (M* ~ 10^11.5M) or largest 
                         (Re ~ 15 kpc) ETGs, the profile is isothermal in the central 
                         regions (~Re/2), while for the low-mass (M* ~ 10^10.2M) or 
                         smallest (Re ~ 0.5 kpc) systems, the profile is steeper than 
                         isothermal, with slopes similar to those for a constant-M/L 
                         profile. For a steeper concentration- mass relation than that 
                         expected from simulations, the correlation of density slope with 
                         galaxy mass tends to flatten, while correlations with Re and 
                         velocity dispersions are more robust. Our results clearly point to 
                         a 'non-homology' in the total mass distribution of ETGs, which 
                         simulations of galaxy formation suggest may be related to a 
                         varying role of dissipation with galaxy mass.",
                  doi = "10.1093/mnras/stu1616",
                  url = "http://dx.doi.org/10.1093/mnras/stu1616",
                 issn = "0035-8711",
                label = "scopus 2015-01 TortoraLaNaRoFeCa:2014:SyVaCe",
             language = "en",
           targetfile = "MNRAS-2014-Tortora-115-27.pdf",
        urlaccessdate = "17 jan. 2021"
}


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