The orbital structure of the massive elliptical galaxy NGC 5846
Date
2008
Authors
Das, P
Gerhard, Ortwin
Coccato, L
Churazov, E.
Forman, W.
Finoguenov, A.
Bohringer, H.
Arnaboldi, Magda
Capaccioli, M
Cortesi, A.
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley-VCH Verlag GMBH
Abstract
We use density and temperature profiles obtained from XMM-Newton observations to derive a potential of NGC 5846 out to 11Re, thus probing the mass distribution deep into the halo. The inferred circular velocity is significantly higher than the extrapolation of dynamical models implying a halo, more massive than previously thought. Using an I-band surfacebrightness profile and a projected velocity dispersion profile consisting of long-slit kinematic measurements and planetary nebulae (PNe) velocity dispersions, we solve the Jeans equations, assuming a non-rotating spherical system. The solutions suggest a highly radially anisotropic galaxy outside 0.7Re with β ∼ 0.75.
Description
Keywords
Keywords: cd; Celestial mechanics; Dark matter; Galaxies: elliptical and lenticular; Galaxies: halos; Galaxies: individual (NGC 5846); Planetary nebulae: general; Stellar dynamics; X-rays: galaxies
Citation
Collections
Source
Astronomische Nachrichten
Type
Journal article
Book Title
Entity type
Access Statement
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DOI
10.1002/asna.200811052
Restricted until
2037-12-31