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26 April 2024

» arxiv » 1310.7870

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NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942
Lorenzo Natalucci ; John A. Tomsick ; Angela Bazzano ; David M. Smith ; Matteo Bachetti ; Didier Barret ; Steven E. Boggs ; Finn E. Christensen ; William W. Craig ; Mariateresa Fiocchi ; Felix Fuerst ; Brian W. Grefenstette ; Charles J. Hailey ; Fiona A. Harrison ; Roman Krivonos ; Erik Kuulkers ; Jon M. Miller ; Katja Pottschmidt ; Daniel Stern ; Pietro Ubertini ; Dominic J. Walton ; William W. Zhang ;
Date:	29 Oct 2013
Abstract:	The microquasar 1E1740.7-2942, also known as the "Great Annihilator", was observed by NuSTAR in the Summer of 2012. We have analyzed in detail two observations taken ~2 weeks apart, for which we measure hard and smooth spectra typical of the low/hard state. A few weeks later the source flux declined significantly. Nearly simultaneous coverage by INTEGRAL is available from its Galactic Center monitoring campaign lasting ~2.5 months. These data probe the hard state spectrum from 1E1740.7-2942 before the flux decline. We find good agreement between the spectra taken with IBIS/ISGRI and NuSTAR, with the measurements being compatible with a change in flux with no spectral variability. We present a detailed analysis of the NuSTAR spectral and timing data and upper limits for reflection of the high energy emission. We show that the high energy spectrum of this X-ray binary is well described by thermal Comptonization.
Source:	arXiv, 1310.7870
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