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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, weexplore 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 stableaccretion during the period of the observations. We find the equatorial columndensity of the obscuring materials to be ~ 2 x 10^24 cm^-2 while the line ofsight column density to be ~ 7 - 8 x 10^23 cm^-22. The source is found to bedeeply buried with the torus covering factor ~ 0.85. We observe variability inthe line-of-sight column density on a timescale of < 35 days. The coveringfactor of the Compton-Thick material is found to be ~ 0.35, in agreement withthe results of recent X-ray surveys. From the variability of the line-of-sightcolumn density, we estimate that the variable absorbing material is likelylocated either in the BLR or in the torus.

Absorption Variability of the Highly Obscured Active Galactic Nucleus NGC 4507