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INTEGRAL discovers a population of persistent intrinsically absorbed super-giant High-Mass X-Ray Binaries

Published online by Cambridge University Press:  12 May 2006

R. Walter ,
J. Zurita ,
L. Bassani ,
A. Bazzano ,
A. Bodaghee ,
A. Dean ,
P. Dubath ,
A. Parmar ,
M. Renaud  and
P. Ubertini
R. Walter
Affiliation:
INTEGRAL Science Data Centre, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
J. Zurita
Affiliation:
INTEGRAL Science Data Centre, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
L. Bassani
Affiliation:
IASF/CNR, Via Piero Gobetti 101, 40129 Bologna, Italy
A. Bazzano
Affiliation:
IASF-INAF, Via Fosso del Cavaliere 100, 00133 Roma, Italy
A. Bodaghee
Affiliation:
INTEGRAL Science Data Centre, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
A. Dean
Affiliation:
School of Physics and Astronomy, University of Southampton, Highfield, S0171BJ, UK
P. Dubath
Affiliation:
INTEGRAL Science Data Centre, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
A. Parmar
Affiliation:
ESTEC, Postbus 299, NL-2200 AG Noordwijk, The Netherlands
M. Renaud
Affiliation:
Service d'astrophysique, DAPNIA/DSM/CEA, 91191 Gif sur Yvette, France
P. Ubertini
Affiliation:
IASF-INAF, Via Fosso del Cavaliere 100, 00133 Roma, Italy
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Abstract

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During the first year in operation, INTEGRAL has detected more than 28 new bright sources which emit the bulk of their emission above 10 keV. Follow-up observations of a subset of these sources in the X-ray band with XMM-Newton indicate that 80% of them are very strongly absorbed. More than half of these absorbed sources show strong pulsations with long periods ranging from 139 to 1300s, i.e., they are slow X-ray pulsars. Many of these new sources are super-giant high-mass X-ray binaries (HMXB) in which the stellar wind of the companion star is accreted onto the compact object. The large local absorption in these new sources can be understood if the compact objects are buried deep in their stellar winds. These new objects represent half of the population of active super-giant HMXB.

Keywords

X-rays: binariesgamma rays: observationsGalaxy: stellar contentstars: mass lossstars: neutronstars: binaries: close
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 351 - 352
Copyright
2006 International Astronomical Union