Absorption variability of the highly obscured active galactic nucleus NGC 4507

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dc.contributor.author Jana, Arghajit
dc.contributor.author Ricci, Claudio
dc.contributor.author Naik, Sachindra
dc.contributor.author Tanimoto, Atsushi
dc.contributor.author Kumari, Neeraj
dc.contributor.author Chang, Hsiang-Kuang
dc.contributor.author Nandi, Prantik
dc.contributor.author Chatterjee, Arka
dc.contributor.author Safi-Harb, Samar
dc.date.accessioned 2022-03-29T10:53:09Z
dc.date.available 2022-03-29T10:53:09Z
dc.date.issued 2022-03
dc.identifier.citation Jana, Arghajit; Ricci, Claudio; Naik, Sachindra; Tanimoto, Atsushi; Kumari, Neeraj; Chang, Hsiang-Kuang; Nandi, Prantik; Chatterjee, Arka and Safi-Harb, Samar, "Absorption variability of the highly obscured active galactic nucleus NGC 4507", arXiv, Cornell University Library, DOI: arXiv:2203.10550, Mar. 2022. en_US
dc.identifier.uri http://arxiv.org/abs/2203.10550
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/7624
dc.description.abstract 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.
dc.description.statementofresponsibility by Arghajit Jana, Claudio Ricci, Sachindra Naik, Atsushi Tanimoto, Neeraj Kumari, Hsiang-Kuang Chang, Prantik Nandi, Arka Chatterjee and Samar Safi-Harb
dc.language.iso en_US en_US
dc.publisher Cornell University Library en_US
dc.subject NuSTAR en_US
dc.subject Galactic nucleus en_US
dc.subject NGC 4507 en_US
dc.subject X-ray en_US
dc.subject Column density en_US
dc.title Absorption variability of the highly obscured active galactic nucleus NGC 4507 en_US
dc.type Pre-Print en_US
dc.relation.journal arXiv

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