Kavli Affiliate: Claudio Ricci
| First 5 Authors: Arghajit Jana, Claudio Ricci, Sachindra Naik, Atsushi Tanimoto, Neeraj Kumari
| Summary:
We present a detailed study of the highly obscured active galaxy NGC 4507,
performed using four Nuclear Spectroscopic Telescope Array (NuSTAR)
observations carried out between May and August in 2015 (~ 130 ks in total).
Using various phenomenological and physically motivated torus models, we
explore the properties of the X-ray source and those of the obscuring material.
The primary X-ray emission is found to be non-variable, indicating a stable
accretion during the period of the observations. We find the equatorial column
density of the obscuring materials to be ~ 2 x 10^24 cm^-2 while the line of
sight column density to be ~ 7 – 8 x 10^23 cm^-22. The source is found to be
deeply buried with the torus covering factor ~ 0.85. We observe variability in
the line-of-sight column density on a timescale of < 35 days. The covering
factor of the Compton-Thick material is found to be ~ 0.35, in agreement with
the results of recent X-ray surveys. From the variability of the line-of-sight
column density, we estimate that the variable absorbing material is likely
located either in the BLR or in the torus.
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