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

We discuss the broadband X-ray spectrum of GRS 1734-292 obtained from non-simultaneous XMM-Newton and NuSTAR 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 $\mathrm{\Gamma }=1.65\pm 0.05$ and a high-energy cutoff $E_c=53_{-8}^{+11}$ keV, one of the lowest measured by NuSTAR in a Seyfert galaxy. Comptonization models show a temperature of the coronal plasma of $k{T}_e=11.9_{-0.9}^{+1.2}$ keV and an optical depth, assuming a slab geometry, $\tau =2.98_{-0.19}^{+0.16}$ or a similar temperature and $\tau =6.7_{-0.4}^{+0.3}$ assuming a spherical geometry. The 2009 XMM-Newton spectrum is well described by a flatter intrinsic continuum ($\mathrm{\Gamma }=1.47_{-0.03}^{+0.07}$) and one absorption line due to Fe$\text{textsc}XXV$ K$\alpha$ produced by a warm absorber. Both data sets show a modest iron K$\alpha$ emission line at $6.4$ keV and the associated Compton reflection, due to reprocessing from neutral circumnuclear material.