Broadband X-ray observations of four gamma-ray narrow-line Seyfert 1 galaxies
M. Berton, V. Braito, S. Mathur, L. Foschini, E. Piconcelli, S. Chen,, R.W. Pogge

TL;DR
This study uses broadband X-ray observations to analyze four gamma-ray detected narrow-line Seyfert 1 galaxies, revealing that their X-ray emission originates from both jets and accretion disk coronae, with variability suggesting dynamic dissipation regions.
Contribution
First broadband X-ray analysis of gamma-ray NLS1s demonstrating the combined jet and corona origin of X-ray emission and variability patterns, highlighting their similarity to blazars.
Findings
X-ray emission from both jet and corona in NLS1s
Dissipation regions vary during flares, inside or outside broad-line region
Jetted NLS1s do not follow the classical fundamental plane of black hole activity
Abstract
Narrow-line Seyfert 1 galaxies (NLS1s) is one of the few classes of active galactic nuclei (AGN) harboring powerful relativistic jets and detected in rays. NLS1s are well-known X-ray sources. While in non-jetted sources the origin of this X-ray emission may be a hot corona surrounding the accretion disk, in jetted objects, especially beamed ones, the contribution of corona and relativistic jet is difficult to disentangle without a proper sampling of the hard X-ray emission. For this reason, we observed with \textit{NuSTAR} the first four NLS1s detected at high energy rays. These data, along with \textit{XMM-Newton} and \textit{Swift/XRT} observations, confirmed that X rays originate both in the jet and in the accretion disk corona. Time variability in hard X rays furthermore suggests that, as observed in flat-spectrum radio quasars, the dissipation region during flares…
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