Volume 383, Number 1, FebruaryIII 2002
|Page(s)||56 - 64|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 February 2002|
M 82's stellar bar
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
Corresponding author: A. Greve, email@example.com
Accepted: 26 November 2001
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 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
© ESO, 2002
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