ANU Open Research Repository has been upgraded. We are still working on a few minor issues, which may result in short outages throughout the day. Please get in touch with repository.admin@anu.edu.au if you experience any issues.
 

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

Source

Astronomische Nachrichten

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1002/asna.200811052

Restricted until

2037-12-31