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 $\tau =2.7_{-1.6}^{+0.2}$.

9 pages, 5 figures, 1 table, accepted for publication in JApA

References in corpus (15)

• HI4PI: A full-sky HI survey based on EBHIS and GASS
• AGN Dusty Tori: I. Handling of Clumpy Media
• Simultaneous X-ray/optical/UV snapshots of active galactic nuclei from XMM-Newton: spectral energy distributions for the reverberation mapped sample
• The Structure of Classical Bulges And Pseudobulges: The Link Between Pseudobulges And Sersic Index
• AGN Type-casting: Mrk 590 No Longer Fits the Role
• The Galaxy Activity, Torus and Outflow Survey (GATOS) I. ALMA images of dusty molecular tori in Seyfert galaxies
• AGN dust tori at low and high luminosities
• NuSTAR Survey of Obscured Swift/BAT-selected Active Galactic Nuclei: II. Median High-energy Cutoff in Seyfert II Hard X-ray Spectra
• X-ray spectral variability of Seyfert 2 galaxies
• RefleX: X-ray absorption and reflection in active galactic nuclei for arbitrary geometries
• A flare in the optical spotted in the changing-look Seyfert NGC 3516
• Broadband X-Ray Observations of the 2018 Outburst of the Changing-Look Active Galactic Nucleus NGC 1566
• "Hidden" Seyfert 2 Galaxies in the Chandra Deep Field North
• The deep look onto the hard X-ray sky: The Swift - INTEGRAL X-ray (SIX) survey
• The post-maximum behaviour of the changing-look Seyfert galaxy NGC 1566