Matt, G., Balkovic, M., Marinucci, A., Ballantyne, D.R., Boggs, S.E., Christensen, F.E., Comastri, A., Craig, W.W., Gandhi, Poshak, Hailey, C.J., Harrison, F.A., Madejski, G., Madsen, K.K., Stern, D. and Zhang, W.W. (2015) The hard X-ray spectrum of NGC 5506 as seen by NuSTAR. Monthly Notices of the Royal Astronomical Society, 447 (4), 3029-3033. (doi:10.1093/mnras/stu2653).
Abstract
NuSTAR observed the bright Compton-thin, narrow-line Seyfert 1 galaxy, NGC 5506, for about 56 ks. In agreement with past observations, the spectrum is well fitted by a power law with ? ? 1.9, a distant reflection component and narrow ionized iron lines. A relativistically blurred reflection component is not required by the data. When an exponential high-energy cutoff is added to the power law, a value of 720+130?190 keV (90?per?cent confidence level) is found. Even allowing for systematic uncertainties, we find a 3? lower limit to the high-energy cutoff of 350 keV, the highest lower limit to the cutoff energy found so far in an AGN by NuSTAR
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