The hard X-ray spectrum of NGC 5506 as seen by NuSTAR
G. Matt, M. Balokovic, A. Marinucci, D.R. Ballantyne, S.E. Boggs, F.E., Christensen, A. Comastri, W. W. Craig, P. Gandhi, C.J. Hailey, F.A. Harrison,, G. Madejski, K.K. Madsen, D. Stern, W. W. Zhang
TL;DR
This study uses NuSTAR observations to analyze the X-ray spectrum of NGC 5506, revealing a high-energy cutoff above 350 keV, the highest lower limit measured in an AGN to date.
Contribution
First measurement of a high-energy cutoff above 350 keV in an AGN using NuSTAR, providing new constraints on the coronal properties of NGC 5506.
Findings
High-energy cutoff lower limit of 350 keV
Spectrum well fit by a power law with Gamma~1.9
No relativistically blurred reflection component required
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 fit by a power law with Gamma~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% confidence level) is found. Even allowing for systematic uncertainties, we find a 3 sigma 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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