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Wolf-Rayet galaxies at many radio wavelengths and Hα: radio super-star-clusters

Published online by Cambridge University Press:  25 May 2016

Sara C. Beck ,
Orly Kovo  and
Jean L. Turner
Sara C. Beck
Affiliation:
Astronomy Department and Wise Observatory, Tel Aviv University, Ramat Aviv 86997, Israel
Orly Kovo
Affiliation:
Astronomy Department and Wise Observatory, Tel Aviv University, Ramat Aviv 86997, Israel
Jean L. Turner
Affiliation:
Division of Astronomy and Astrophysics, UCLA, Los Angeles, CA 90095-1562, USA

Abstract

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We have observed nine Wolf-Rayet galaxies at 20,6, 3.6 and 2 cm from the VLA and at Hα from the Wise Observatory, and have mapped the radio spectral index in each galaxy on sub-arcsec scales. We find that more than half the WR sample has distinct regions where the radio spectrum rises between 6 and 2 cm. We believe that this is the radio signature of the youngest super-star-clusters which are otherwise invisible, and which require NLyc ≳ 1052, or equivalent to 750 stars of the 07 subtype. We call these sources radio super-star-clusters.

Type
Part 5. Wolf-Rayet stars and other massive stars in starburst galaxies: the case of Wolf-Rayet galaxies (integrated spectra)
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 587
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Turner, J., Ho, P.T.P.H., Beck, S.C. 1998, AJ 116, 1212 CrossRefGoogle Scholar