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A New Population of X-ray Transients in the Galactic Center

Published online by Cambridge University Press:  19 July 2016

Masaaki Sakano ,
Robert S. Warwick ,
Anne Decourchelle  and
Q. Daniel Wang
Masaaki Sakano
Affiliation:
University of Leicester, Leicester LE1 7RH, UK
Robert S. Warwick
Affiliation:
University of Leicester, Leicester LE1 7RH, UK
Anne Decourchelle
Affiliation:
CEA/DSM/DAPNIA, C.E. Saclay, 91191 Gif-sur-Yvette Cedex, France
Q. Daniel Wang
Affiliation:
University of Massachusetts, Amherst, MA 01003, USA

Abstract

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A comparison of the XMM-Newton and Chandra Galactic Center Surveys has revealed two faint X-ray transients with contrasting properties. The X-ray spectrum of XMM J174544−2913.0 shows a strong iron line with an equivalent width of ∼2 keV, whereas that of XMM J174457−2850.3 is characterized by a very hard continuum with photon index ∼1.0. The X-ray flux of both sources varied by more than two orders of magnitude over a period of months with a peak X-ray luminosity of 5 × 1034 ergs s−1. We discuss the nature of these peculiar sources.

Type
Part 11: Accreting Pulsars
Information
Symposium - International Astronomical Union , Volume 218: Young Neutrons Stars and their Environments , 2004 , pp. 451 - 452
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Sakano, M. et al. 2002, ApJS, 138, 19.Google Scholar
Terada, Y. et al. 1999, PASJ, 51, 39.CrossRefGoogle Scholar