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Astron. Astrophys. 356, 102-107 (2000)

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The formation of bars and disks in Markarian starburst galaxies

R. Coziol 1, S. Considère 1, E. Davoust 2 and T. Contini 3

1 Observatoire de Besançon, UPRES-A 6091, B.P. 1615, 25010 Besançon Cedex, France
2 Observatoire Midi-Pyrénées, UMR 5572, 14 Avenue E. Belin, 31400 Toulouse, France
3 European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany

Received 29 November 1999 / Accepted 13 January 2000

Abstract

We have proposed in a companion paper (Considère et al. 2000) that bars appeared recently in massive starburst nucleus galaxies. We now test this hypothesis on an extended sample of barred and unbarred Markarian starburst galaxies, using several samples of normal galaxies as control samples.

In support of this hypothesis, we show that the proportion of barred galaxies is much lower in Markarian starburst galaxies than in normal galaxies. In addition to this deficiency of bars, we find that Markarian starburst galaxies have smaller disks than normal galaxies, and that the disks of unbarred starburst galaxies are smaller, on average, than barred ones. Finally, we show that the Markarian starburst galaxies do not seem to follow the local Tully-Fisher relation.

Various alternatives are examined to explain the deficiency of bars and the small disk dimensions in Markarian starburst galaxies. One possibility, which is in agreement with the young bar hypothesis, is that the formation of disks happens after the formation of bulges and that bars appear only later, when enough gas has been accreted in the disk.

Key words: galaxies: abundances – galaxies: spiral – galaxies: starburst

Send offprint requests to: R. Coziol (coziol@obs-besancon.fr)

This article contains no SIMBAD objects.

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© European Southern Observatory (ESO) 2000

Online publication: March 28, 2000
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