EDP Sciences
Free Access
Volume 406, Number 1, July IV 2003
Page(s) 299 - 304
Section Stellar atmospheres
DOI https://doi.org/10.1051/0004-6361:20030770

A&A 406, 299-304 (2003)
DOI: 10.1051/0004-6361:20030770

$\vec{XMM}$- $\vec{Newton}$ study of the persistent X-ray source 1E 1743.1-2843 located in the Galactic Center direction

D. Porquet1, J. Rodriguez1, 2, S. Corbel1, 3, P. Goldoni1, R. S. Warwick4, A. Goldwurm1 and A. Decourchelle1

1  Service d'Astrophysique, CNRS URA 2052, CEA Saclay, 91191 Gif-sur-Yvette, France
2  Integral Science Data Center, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
3  Université Paris VII, fédération APC, 2 place Jussieu, 75005 Paris Cedex, France
4  X-Ray Astronomy Group, Department of Physics and Astronomy, Leicester University, LE1 7RH, UK

(Received 30 January 2003 / Accepted 20 May 2003 )

We report the results of an XMM-Newton observation of the persistent X-ray source 1E 1743.1-2843 , located in the Galactic Center (GC) direction. We determine the position of the source at $\alpha_{\rm J2000}=17^{\rm h}\,46^{\rm m}\,21.0^{\rm s}$, $\delta_{\rm J2000}=-28^{\circ}\,43^{\prime}\,44^{\prime\prime}$ (with an uncertainty of 1.5 $^{\prime\prime}$), which is the most accurate to date, and will enable cross-identifications at other wavelengths. The source was bright during this observation ( $L_{\rm 2-10\,keV} \sim 2.7 \times 10^{36}\
d^{2}_{\rm 10\,kpc}$  erg s -1 for a power-law continuum), with no significant variability. We propose that 1E 1743.1-2843 may be explained in terms of a black hole candidate in a low/hard state. There is an indication that the source exhibits different states from a comparison of our results with previous observations (e.g., ART-P, BeppoSAX). However, the present spectral analysis does not rule out the hypothesis of a neutron star low-mass X-ray binary as suggested previously. If 1E 1743.1-2843 is actually located in the GC region, we might expect to observe significant 6.4 keV fluorescent iron line emission from nearby molecular clouds (e.g., GCM+0.25+0.01).

Key words: X-rays: general -- X-rays individual: 1E 1743.1-2843 -- stars: neutron -- black hole physics -- stars: binaries: general

Offprint request: D. Porquet, dporquet@mpe.mpg.de (current address)

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