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Astron. Astrophys. 358, 462-470 (2000)

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Hard X-rays emitted by starbursts as predicted by population synthesis models including a realistic fraction of interacting binaries

J. Van Bever and D. Vanbeveren

Vrije Universiteit Brussel, Astrophysical Institute, Pleinlaan 2, 1050 Brussels, Belgium (jvbever@vub.ac.be; dvbevere@vub.ac.be)

Received 27 August 1999 / Accepted 15 December 1999


We combine our close binary population number synthesis code with the formation mechanism of X-radiation in young supernova remnants and in high mass X-ray binaries, to predict the hard X-ray luminosity emitted by starbursts. We demonstrate that the impact of interacting binaries is substantial. Therefore, observations of hard X-rays with energies larger than 2 keV of starburst regions may highlight the importance of close binary evolution in understanding properties of active starformation regions.

Key words: stars: binaries: close – ISM: supernova remnants – galaxies: starburst – galaxies: stellar content – X-rays: stars

Send offprint requests to: J. Van Bever

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© European Southern Observatory (ESO) 2000

Online publication: June 8, 2000