Broadband X-ray spectral analysis of the Seyfert 1 galaxy GRS 1734-292

Creators: Tortosa, A.; Marinucci, A.; Matt, G.; Bianchi, S.; La Franca, F.; Ballantyne, D. R.; Boorman, P. G.; Fabian, A. C.; Farrah, D.; Fuerst, F.; Gandhi, P.; Harrison, F. A.; Koss, M. J.; Ricci, C.; Stern, D.; Ursini, F.; Walton, D. J.

Abstract

We discuss the broad-band X-ray spectrum of GRS 1734−292 obtained from non-simultaneous XMM–Newton and NuSTAR (Nuclear Spectroscopic Telescope Array) observations, performed in 2009 and 2014, respectively. GRS1734−292 is a Seyfert 1 galaxy, located near the Galactic plane at z = 0.0214. The NuSTAR spectrum (3–80 keV) is dominated by a primary power-law continuum with Γ = 1.65 ± 0.05 and a high-energy cut-off E_c=53^(+11)_(−8) keV, one of the lowest measured by NuSTAR in a Seyfert galaxy. Comptonization models show a temperature of the coronal plasma of kT_e=11.9^(+1.2)_(−0.9) keV and an optical depth, assuming a slab geometry, τ=2.98^(+0.16)_(−0.19) or a similar temperature and τ=6.7^(+0.3)_(−0.4) assuming a spherical geometry. The 2009 XMM–Newton spectrum is well described by a flatter intrinsic continuum (Γ=1.47^(+0.07)_(−0.03)) and one absorption line due to Fe XXV Kα produced by a warm absorber. Both data sets show a modest iron Kα emission line at 6.4 keV and the associated Compton reflection, due to reprocessing from neutral circumnuclear material.

Additional Information

© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 December 14. Received 2016 December 14; in original form 2016 September 8. Published: 17 December 2016. We thank the anonymous referee for comments that helped improving the clarity of the paper. This work made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software and Calibration teams for support with the execution and analysis of these observations. This research has made use of theNuSTAR Data Analysis Software (NUSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). The work is also based on observations obtained with XMM–Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA). AT, AM, GM and FU acknowledge financial support from Italian Space Agency under grant ASI/INAF I/037/12/0-011/13 and SB under grant ASI-INAF I/037/12/P1. AT, AM, SB and GM acknowledge financial support from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 312789.

Attached Files

Published - stw3301.pdf

Submitted - 1612.05871.pdf

Files

stw3301.pdf

Files (2.0 MB)

Name	Size	Download all
stw3301.pdf md5:0b102946ce54c9ad904ae73867cc7db8	1.3 MB	Preview Download
1612.05871.pdf md5:aad6370823413f5f9ba42e5f71f2afc8	788.9 kB	Preview Download

Additional details

	All versions	This version
Views	0	0
Downloads	0	0
Data volume	0 Bytes	0 Bytes