Isolated AGNs NGC 5347, ESO 438-009, MCG-02-04-090, and J11366-6002: Swift and NuSTAR joined view

Abstract

We present the spectral analysis with the Nuclear Spectroscopic Telescope Array (NuSTAR) of four isolated galaxies with active galactic nuclei selected from 2MIG catalogue: NGC 5347, ESO 438-009, MCG-02-09-040, and IGR J11366-6002. We also used the Swift/Burst Alert Telescope (BAT) data up to $\sim$ 150 keV for MCG 02-09-040, ESO 438-009, and IGR J11366-6002 as well as the Swift/XRT data in 0.3--10 keV energy band for NGC 5347, ESO 438-009, and IGR J11366-6002. All the sources appear to have the reflected spectrum component with different reflection fractions in addition to the primary power-law continuum. We found that power-law indices for these sources lie between 1.6 to 1.8. The spectra of two sources, NGC 5347 and MCG-02-09-040, show the Fe $K_α$ emission line. For both of these sources, the Fe $K_α$ lines have a large value of EW $\sim$ 1 keV. The X-ray spectrum of NGC 5347 is being best fitted by a pure reflection model with $E_{cut} \sim 117$ keV and without the presence of any additional primary power-law component. We also found that X-ray spectrum of MCG -02-09-040 shows the presence of heavy neutral obscuration of $N_{H}\sim10^{24}~cm^{-2}$. However, this provides a non-physical value of reflection in the case with fitting by a simple reflection model. A more appropriate fit is obtained with adopting the physical Monte Carlo based model as BNTorus. It allowed us to determine the absorption value of N$_{H}\sim1.04\times10^{24}~cm^{-2}$ and reasonable power-law index of $Γ\approx 1.63$. Results for MCG -02-09-040 are presented for the first time.