Paper: astro-ph/0607388
Date: Mon, 17 Jul 2006 16:26:52 GMT (49kb)

Title: First broad band study of the mysterious source 1E 1743.1-2843

Authors: M. Del Santo, L. Sidoli, A. Bazzano, M. Cocchi, G. De Cesare, A.
Paizis, P. Ubertini

Comments: 4 pages, 3 figures, accepted for publication in A&A
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In the last years, the persistent source 1E 1743.1-2843 has been observed in
the X-rays, but never above 20 keV. In previous works, it was stressed that a
possible high energy emission could give further indications on the accreting
object nature which remains still unknown. We present here more than two years
of 1E 1743.1-2843 monitoring with INTEGRAL/IBIS as well as public XMM-Newton
and Chandra X-ray observations. The temporal study in the 20-40 keV band shows
a rather constant flux on few months time scale. Based on this result we have
performed the broad-band spectral analysis using EPIC/IBIS non simultaneous
data and ACIS-I/IBIS data collected during 2004. In ~2 Ms, we report a
detection of 6 sigma in the energy range 35-70 keV. The first broad-band study
(2-70 keV) shows a steep slope (~3) and a black body temperature of 1.7 keV.
Combining spectral parameters and discussion about the luminosity evaluations
for different possible distances, our conclusions are in favour of a LMXB
system with a neutron star at distance higher than the Galactic Centre, even
though a firm conclusion can not be stated.

\\ ( http://arXiv.org/abs/astro-ph/0607388 , 49kb)