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Issue A&A
Volume 381, Number 3, January III 2002
Page(s) 825 - 833
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011467



A&A 381, 825-833 (2002)
DOI: 10.1051/0004-6361:20011467

A search for radio supernovae and supernova remnants in the region of NGC 1569's super star clusters

A. Greve1, A. Tarchi2, 3, S. Hüttemeister4, 5, R. de Grijs6, J. M. van der Hulst7, S. T. Garrington8 and N. Neininger2

1  Institut de Radio Astronomie Millimétrique, 300 rue de la Piscine, 38406 St. Martin d'Hères, France
2  Astronomisches Institut der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
3  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
4  Astronomisches Institut der Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany
5  Onsala Space Observatory, 43920 Onsala, Sweden
6  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
7  Kapteyn Astronomical Instituut, Postbus 800, 9700 AV Groningen, The Netherlands
8  Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield Cheshire SK11 9DL, UK

(Received 20 April 2001 / Accepted 22 October 2001)

Abstract
We have used MERLIN, at 1.4 and 5 GHz, to search for radio supernovae (RSNe) and supernova remnants (SNRs) in the unobscured irregular dwarf galaxy NGC 1569, and in particular in the region of its super star clusters (SSCs) A and B. Throughout NGC 1569 we find some 5 RSNe and SNRs but the SSCs and their immediate surroundings are largely devoid of non-thermal radio sources. Even though many massive stars in the SSCs are expected to have exploded already, when compared with M 82 and its many SSCs the absence of RSNe and SNRs in and near A and B may seem plausible on statistical arguments. The absence of RSNe and SNRs in and near A and B may, however, also be due to a violent and turbulent outflow of stellar winds and supernova ejected material, which does not provide a quiescent environment for the development of SNRs within and near the SSCs.


Key words: galaxies: individual: NGC 1569 -- galaxies: ISM

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

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© ESO 2002


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