The Seyfert 2 galaxy NGC 2110: hard X-ray emission observed by NuSTAR and variability of the iron K$\alpha$ line

Abstract

We present NuSTAR observations of the bright Seyfert 2 galaxy NGC 2110 obtained in 2012, when the source was at the highest flux level ever observed, and in 2013, when the source was at a more typical flux level. We include archival observations from other X-ray satellites, namely XMM-Newton, Suzaku, BeppoSAX, Chandra and Swift. Simultaneous NuSTAR and Swift broad band spectra (in the 3-80 keV range) indicate a cutoff energy $E_{\mathrm{c}}>210$ keV, with no detectable contribution from Compton reflection. NGC 2110 is one of the very few sources where no evidence for distant Compton thick scattering is found and, by using temporal information collected over more than a decade, we investigate variations of the iron K$\alpha$ line on time scales of years. The Fe K$\alpha$ line is likely the sum of two components: one constant (originating from distant Compton-thick material) and the other one variable and linearly correlated with the source flux (possibly arising from Compton-thin material much closer to the black hole).

10 pages, 6 figures, accepted for publication on MNRAS

References in corpus (12)

• An XMM-Newton survey of broad iron lines in Seyfert galaxies
• CAIXA: a Catalogue of AGN In the XMM-Newton Archive I. Spectral analysis
• The X-ray and Radio Connection in Low-luminosity Active Nuclei
• Seyfert galaxies in the local Universe (z$\le$ 0.1): the average X-ray spectrum as seen by $BeppoSAX$
• 9.7 um Silicate Features in AGNs: New Insights into Unification Models
• A BLR origin for the iron K$\alpha$ line in NGC7213
• The Origin of the Silicate Emission Features in the Seyfert 2 Galaxy, NGC 2110
• The Chandra, HST, and VLA View of the Circumnuclear Extended Emission in the Narrow Emission Line Galaxy NGC 2110
• Probing Unification With Chandra HETGS and XMM-Newton EPIC And RGS Spectroscopy of the Narrow Emission Line Galaxy NGC 2110
• Transient and Highly Polarized Double-Peaked H-alpha Emission in the Seyfert 2 Nucleus of NGC 2110
• Tracking the Complex Absorption in NGC 2110 with Two Suzaku Observations
• Hidden Double-Peaked Emitters in Seyfert 2 Galaxies

Cited by in corpus (15)

• BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
• The hard X-ray spectrum of NGC 5506 as seen by NuSTAR
• NuSTAR Survey of Obscured Swift/BAT-selected Active Galactic Nuclei: II. Median High-energy Cutoff in Seyfert II Hard X-ray Spectra
• Coronal Properties of the Seyfert 1.9 Galaxy MCG -05-23-016 Determined from Hard X-ray Spectroscopy with NuSTAR
• A Long Look At MCG-5-23-16 With NuSTAR: I- Relativistic Reflection And Coronal Properties
• The variable and non-variable X-ray absorbers in Compton-thin type-II Active Galactic Nuclei
• Application of X-Ray Clumpy Torus Model (XCLUMPY) to 10 Obscured Active Galactic Nuclei Observed with Suzaku and NuSTAR
• Correlation between relativistic reflection fraction and photon index in NuSTAR sample of Seyfert 1 AGN
• Narrow Fe-K$\alpha$ Reverberation Mapping Unveils the Deactivated Broad-Line Region in a Changing-Look Active Galactic Nucleus
• AGN X-ray irradiation of CO gas in NGC 2110 revealed by $Chandra$ and ALMA
• Detection of the high energy cut-off from the Seyfert 1.5 galaxy NGC 5273
• Direct observation of the Broad Line Region in X-rays during the low state of NGC4051
• On the equivalent width of the Fe K$\alpha$ line produced by a dusty absorber in active galactic nuclei
• Dust Reverberation Mapping of Type 2 AGN NGC 2110 Realized with X-ray and 3-5 $\mu$m IR monitoring
• X-ray polarization observations of NGC 2110 with IXPE