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Issue A&A
Volume 383, Number 1, February III 2002
Page(s) 56 - 64
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011723



A&A 383, 56-64 (2002)
DOI: 10.1051/0004-6361:20011723

M 82's stellar bar

A. Greve1, K. A. Wills2, N. Neininger3 and A. Pedlar4, 5

1  Institut de Radio Astronomie Millimétrique, 300 rue de la Piscine, 38406 St. Martin d'Hères, France
2  Department of Physics and Astronomy, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK
3  Astronomisches Institut der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
4  University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, UK
5  Onsala Space Observatory, 43992 Onsala, Sweden

(Received 28 September 2001 / Accepted 26 November 2001 )

Abstract
The fueling of the starburst in M 82 may be related to a stellar bar which pushes gas towards the center where it forms stars. The observation by McKeith et al. (1993) of the near-IR Ca II photospheric absorption line allows a direct velocity measurement of the stars in M 82, and provides by this a confirmation of the predicted x1 and x2-orbits of the bar in M 82. From this and other observations we find that the mass of the x2-orbit stars is ~15% of the mass of the bar, and that the mass of the bar of $2\times 10^{9}\,M_{\odot}$ is 20-40% of M 82's mass. This mass concentration of ~1 kpc extent at the center of M 82 underlines the dynamic importance of the bar.


Key words: galaxies: individual: M 82 -- galaxies: structure -- galaxies: stellar content

Offprint request: A. Greve, greve@iram.fr

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