Broad-line Region Clouds orbiting an AGN sample
J. Armijos-Abenda\~no, E. L\'opez, M. Llerena, C. H. A. Logan

TL;DR
This study analyzes X-ray data from six active galaxies to identify and characterize eclipsing clouds near their supermassive black holes, revealing properties consistent with broad-line region clouds and their impact on X-ray variability.
Contribution
It provides the first detailed estimates of the physical properties and locations of eclipsing clouds in multiple AGNs using spectral and temporal analysis of XMM-Newton data.
Findings
Eclipsing clouds are consistent with broad-line region clouds in several AGNs.
The size of X-ray sources is estimated to be smaller than the eclipsing clouds.
An anti-correlation between black hole mass and Fe line EW is observed in Seyfert 1 galaxies.
Abstract
We present a spectral and temporal analysis of XMM-Newton data from a sample of six galaxies (NGC 3783, Mrk 279, Mrk 766, NGC 3227, NGC 7314, and NGC 3516). Using the hardness-ratio curves, we identify time-intervals in which clouds are eclipsing the central X-ray source in five of the six sources. We detect three occultations in NGC 3227 and one occultation in NGC 3783, NGC 7314, and NGC 3516, together with the well-known occultations in Mrk 766. We estimate the physical properties of the eclipsing clouds. The derived physical size of the X-ray sources ((3-28)10 cm) is less than that of the eclipsing clouds with column densities of 10-10 cm, thus a single cloud may block the X-ray source, leading to notorious temporal variability of the X-ray flux. The eclipsing clouds in Mrk 766, NGC 3227, NGC 7314, and NGC 3516 with distances from the…
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