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http://hdl.handle.net/20.500.12386/26249
Titolo: | Systematic Variation of Central Mass Density Slope in Early-Type Galaxies | Autori: | TORTORA, CRESCENZO LA BARBERA, Francesco NAPOLITANO, NICOLA ROSARIO Romanowsky, A. J. Ferreras, I. de Carvalho, R. R. |
Data pubblicazione: | 2016 | Titolo del volume in cui è pubblicato il poster: | The Universe of Digital Sky Surveys: a Meeting to Honour the 70th Birthday of Massimo Capaccioli | Curatore/i del volume in cui è pubblicato il contributo: | Napolitano, Nicola R.; Longo, Giuseppe; Marconi, Marcella; Paolillo, Maurizio; Iodice, Enrichetta | Serie: | ASTROPHYSICS AND SPACE SCIENCE PROCEEDINGS | Numero: | 42 | Da pagina:: | 215 | Abstract: | We study the total density distribution in the central regions (≲ 1 effective radius, R <SUB>e</SUB>) of early-type galaxies (ETGs), using data from the SPIDER survey (La Barbera et al., MNRAS 408:1313, 2010). We model each galaxy with two components (dark matter halo + stars), exploring different assumptions for the dark matter (DM) halo profile, and leaving stellar mass-to-light (M <SUB>⋆</SUB>/L) ratios as free fitting parameters to the data. For a Navarro et al. (ApJ 462:563, 1996) profile, the slope of the total mass profile is non-universal. For the most massive and largest ETGs, the profile is isothermal in the central regions (∼ R<SUB>e</SUB>/2), while for the low-mass and smallest systems, the profile is steeper than isothermal, with slopes similar to those for a constant-M/L profile. For a concentration-mass relation steeper than that expected from simulations, the correlation of density slope with mass tends to flatten. 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. | Titolo del convegno: | The Universe of Digital Sky Surveys: a Meeting to Honour the 70th Birthday of Massimo Capaccioli | Luogo del convegno: | Napoli, Italy | Periodo del convegno: | 25-28 November, 2014 | URI: | http://hdl.handle.net/20.500.12386/26249 | URL: | https://arxiv.org/abs/1507.01210 | ISSN: | 1570-6591 | ISBN: | 978-3-319-19329-8 | DOI: | 10.1007/978-3-319-19330-4_33 | Bibcode ADS: | 2016ASSP...42..215T | Fulltext: | open |
È visualizzato nelle collezioni: | 3.01 Contributi in Atti di convegno |
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Tortora+15_slope_pro.pdf | preprint | 34.32 kB | Adobe PDF | Visualizza/apri |
Tortora2016_Chapter_SystematicVariationOfCentralMa.pdf | [Administrators only] | 118.43 kB | Adobe PDF |
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