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A&A Supplement series, Vol. 127, January II 1998, 119-138

Received March 3; accepted April 24, 1997

A radio continuum study of the Magellanic Clouds

VI. Discrete sources common to radio and X-ray surveys of
the Magellanic Cloudsgif

M.D. Filipovictex2html_wrap2438, W. Pietschtex2html_wrap2440, R.F. Haynestex2html_wrap2442, G.L. Whitetex2html_wrap2444, P.A. Jonestex2html_wrap2444, R. Wielebinskitex2html_wrap2448, U. Kleintex2html_wrap2450, K. Dennerltex2html_wrap2440, P. Kahabkatex2html_wrap2454, and J.S. Lazendictex2html_wrap2456

Send offprint request: M.D. Filipovic

tex2html_wrap2458  University of Western Sydney, Nepean, P.O. Box 10, Kingswood, NSW 2747, Australia;;

tex2html_wrap2460  Australia Telescope National Facility, CSIRO, P.O. Box 76, Epping, NSW 2121, Australia;
tex2html_wrap2462 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85740 Garching, Germany;

tex2html_wrap2462  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

tex2html_wrap2464  Radioastronomisches Institut der Universitat Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany

tex2html_wrap2466  Center for High Energy Astrophysics, University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, The Netherlands

tex2html_wrap2468  Department of Astronomy, University of Belgrade, Studentski trg 13, 11000 Beograd, Serbia, Yugoslavia


By comparing Parkes telescope radio surveys with the X-ray ROSAT All-Sky Survey (RASS) we have found 71 discrete sources of both radio and X-ray emission in the Large Magellanic Cloud (LMC). These 71 sources are mainly supernova remnants (SNRs) and SNR candidates (36), and background sources (27). For six of the sources we have no proposed identification and the other two are HII regions. A source-intensity comparison of the radio and X-ray sources shows very little correlation, but we note that the strongest SNRs at both radio and X-ray frequencies are young SNRs from Population I. Six new LMC SNR candidates are proposed. From the radio flux density of the SNRs we have estimated the SNR birth rate to be one every 100 (tex2html_wrap_inline241420) yr and the star-formation rate (SFR) to be tex2html_wrap_inline2416) tex2html_wrap_inline2418.

A similar comparison was undertaken for the Small Magellanic Cloud (SMC), but instead of the RASS we used a roster of pointed observations made with the ROSAT Position Sensitive Proportional Counter (PSPC). This comparison resulted in 27 sources in common between the Parkes radio and ROSAT PSPC surveys. Two new SMC sources are proposed for SNR candidates. The SMC SNR birth rate was estimated to be one every tex2html_wrap_inline2420 yr and the SFR was estimated to be tex2html_wrap_inline2422 tex2html_wrap_inline2418.

keywords: galaxies: Magellanic Clouds -- radio continuum: galaxies -- X-rays: galaxies -- ISM: supernova remnants (SNRs) -- ISM: HII regions

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