XMM-Newton and INTEGRAL analysis of the Supergiant Fast X-ray Transient IGR J17354-3255. (arXiv:1811.11882v1 [astro-ph.HE])

XMM-Newton and INTEGRAL analysis of the Supergiant Fast X-ray Transient IGR J17354-3255. (arXiv:1811.11882v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Goossens_M/0/1/0/all/0/1">M. E. Goossens</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bird_A/0/1/0/all/0/1">A. J. Bird</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hill_A/0/1/0/all/0/1">A. B. Hill</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sguera_V/0/1/0/all/0/1">V. Sguera</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Drave_S/0/1/0/all/0/1">S. P. Drave</a>

We present the results of combined INTEGRAL and XMM-Newton observations of
the supergiant fast X-ray transient (SFXT) IGR J17354$-$3255. Three XMM-Newton
observations of lengths 33.4 ks, 32.5 ks and 21.9 ks were undertaken, the first
an initial pointing to identify the correct source in the field of view and the
latter two performed around periastron. Simultaneous INTEGRAL observations
across $sim66%$ of the orbital cycle were analysed but the source was neither
detected by IBIS/ISGRI nor by JEM-X. The XMM-Newton light curves display a
range of moderately bright X-ray activity but there are no particularly strong
flares or outbursts in any of the three observations. We show that the spectral
shape measured by XMM-Newton can be fitted by a consistent model throughout the
observation, suggesting that the observed flux variations are driven by
obscuration from a wind of varying density rather than changes in accretion
mode. The simultaneous INTEGRAL data rule out simple extrapolation of the
simple powerlaw model beyond the XMM-Newton energy range.

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