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

TL;DR

This study analyzes four isolated AGNs using combined NuSTAR and Swift data, revealing reflection components, Fe Kα lines, and obscuration properties, with some results presented for the first time.

Contribution

First-time detailed X-ray spectral analysis of MCG-02-09-040, highlighting reflection features and obscuration using advanced models.

Findings

NGC 5347 best fitted by pure reflection model

MCG-02-09-040 shows heavy neutral obscuration

Fe Kα lines with large EW (~1 keV) detected in two sources

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 $K_{\alpha}$ emission line. For both of these sources, the Fe $K_{\alpha}$ 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 $\Gamma \approx 1.63$. Results for MCG -02-09-040 are presented for the first time.