Evidence of Heavy Obscuration in the Low-Luminosity AGN NGC 4941

Abstract

We present the results obtained from timing and spectral studies of the highly obscured low luminosity active galactic nucleus NGC~4941 using data obtained from the {\it Nuclear Spectroscopic Telescope Array} and the {\it Neil Gehrels Swift} Observatories. We find similar variability in $3-10$~keV and $10-60$~keV energy ranges with fractional rms variability of $\sim$14\%. We investigate broad-band spectral properties of the source in 3-150 keV range, using data from {\it NuSTAR} and {\it Swift}/BAT, with phenomenological slab model and physically motivated {\tt mytorus} model. From the spectral analysis, we find heavy obscuration with the global average column density of the obscured material as $3.09_{-1.01}^{+1.68}\times 10^{24}$ cm${}^{-2}$. Evidence of a strong reflection component is observed in the spectrum. We detect a strong iron line with an equivalent width of $\sim$1~keV. From the slab model, we obtain the exponential cutoff energy as $177_{-16}^{+92}$~keV. From this, we estimate the Compton cloud properties with the hot electron temperature $k{T}_{\mathrm{e}}=59_{-5}^{+31}$~keV and the optical depth $\tau =2.7_{-1.6}^{+0.2}$.

arXiv comment9 pages, 5 figures, 1 table, accepted for publication in JApA

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