2017MNRAS.466.4193T

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.