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ROSAT Observations of Globular Clusters in the Galaxy and in M31

Published online by Cambridge University Press:  25 May 2016

Helen M. Johnston ,
Frank Verbunt ,
Günther Hasinger  and
Wolfram Bunk
Helen M. Johnston
Affiliation:
Astronomical Institute, Utrecht University, Postbus 80.000, NL-3508 TA Utrecht, The Netherlands
Frank Verbunt
Affiliation:
Astronomical Institute, Utrecht University, Postbus 80.000, NL-3508 TA Utrecht, The Netherlands
Günther Hasinger
Affiliation:
Astrophysikalisches Institut, An der Sternwarte 16, D-14482 Potsdam, Germany
Wolfram Bunk
Affiliation:
MPI für extraterrestrische Physik, D-85748 Garching bei München, Germany

Abstract

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X-ray sources in globular clusters fall into two categories: the “bright” sources, with LX ∼ 1036-1038 erg s−1, and the “dim” sources, with LX ≲ 1034.5 erg s−1. The bright sources are clearly associated with accreting neutron stars in binary systems. The nature of the dim sources, however, remains in doubt. We review recent observations of globular-cluster X-ray sources with the ROSAT satellite. ROSAT detected bright sources in M31 globular clusters and greatly increased the number of dim sources known in galactic globular clusters. We discuss what these new observations have taught us about the distribution and nature of such sources, their spectral properties, and their underlying luminosity function.

Type
6 Binaries in Globular Clusters
Information
Symposium - International Astronomical Union , Volume 165: Compact Stars in Binaries , 1996 , pp. 389 - 400
Copyright
Copyright © Kluwer 1996 

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