Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26249
Title: | Systematic Variation of Central Mass Density Slope in Early-Type Galaxies | Authors: | TORTORA, CRESCENZO LA BARBERA, Francesco NAPOLITANO, NICOLA ROSARIO Romanowsky, A. J. Ferreras, I. de Carvalho, R. R. |
Issue Date: | 2016 | Volume: | The Universe of Digital Sky Surveys: a Meeting to Honour the 70th Birthday of Massimo Capaccioli | Editors: | Napolitano, Nicola R.; Longo, Giuseppe; Marconi, Marcella; Paolillo, Maurizio; Iodice, Enrichetta | Series: | ASTROPHYSICS AND SPACE SCIENCE PROCEEDINGS | Number: | 42 | First Page: | 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. | Conference Name: | The Universe of Digital Sky Surveys: a Meeting to Honour the 70th Birthday of Massimo Capaccioli | Conference Place: | Napoli, Italy | Conference Date: | 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 |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Tortora+15_slope_pro.pdf | preprint | 34.32 kB | Adobe PDF | View/Open |
Tortora2016_Chapter_SystematicVariationOfCentralMa.pdf | [Administrators only] | 118.43 kB | Adobe PDF |
Page view(s)
62
checked on Apr 24, 2024
Download(s)
17
checked on Apr 24, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.