Evidence for coronal temperature variation in Seyfert 2 ESO 103--035 using NuSTAR observations

Abstract

We report flux-resolved spectroscopic analysis of the active galactic nucleus (AGN) ESO 103--035 using \textit{NuSTAR} observations. Following an earlier work, we fit the spectra using a thermal Comptonization model with a relativistic reflection component to obtain estimates of the coronal temperature for two flux levels. The coronal temperature was found to increase from 24.0${}_{-3.4}^{+6.8}$ to 55.3${}_{-7.2}^{+54.6}$ keV (errors at 1-$\sigma$ confidence level) as the flux increased from $9.8$ to $11.9\times 10^{-11}$ erg cm${}^{-2}$ s${}^{-1}$ in the 3--78 keV band. A marginal variation in the high energy photon index allows for both, a non-varying optical depth and for the optical depth to have varied by a factor of $\sim$2. This is in contrast to a previous work on \textit{NuSTAR} flux resolved spectroscopy of the AGN, Ark 564, where the temperature was found to decrease with flux along with a $10$\% variation in the optical depth. The results maybe understood in a framework where AGN variability is either dominated by coronal heating variation leading to correlated increase of temperature with flux and the opposite effect being seen when the variability is dominated by changes in the seed photon flux.

arXiv commentAccepted for Publication in ApJ, 8 Pages, 4 Figures, 2 Tables

References in corpus (31)

• On the Absorption of X-rays in the Interstellar Medium
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Broad-band gamma-ray and X-ray spectra of NGC 4151 and their implications for physical processes and geometry
• The May 1989 outburst of the Soft X-ray Transient GS 2023+338 (V404 Cyg)
• Correlations between X-ray and radio spectral properties of accreting black holes
• The long term X-ray spectral variability of AGN
• X-ray variability and correlations in the two phase disk-corona model for Seyfert galaxies
• Driving extreme variability: The evolving corona and evidence for jet launching in Markarian 335
• Properties of AGN coronae in the NuSTAR era II: hybrid plasma
• A NuSTAR census of coronal parameters in Seyfert galaxies
• The high-Eddington NLS1 Ark 564 has the coolest corona
• Velocity width measurements of the coolest X-ray emitting material in the cores of clusters, groups and elliptical galaxies
• Black hole masses from power density spectra: determinations and consequences
• NuSTAR Reveals the Comptonizing Corona of the Broad-Line Radio Galaxy 3C 382
• On Estimating the High-Energy Cutoff in the X-ray Spectra of Black Holes via Reflection Spectroscopy
• A Long Look At MCG-5-23-16 With NuSTAR: I- Relativistic Reflection And Coronal Properties
• Relations between phenomenological and physical parameters in the hot coronae of AGNs computed with the MoCA code
• A New Sample of Buried Active Galactic Nuclei Selected from the Second XMM-Newton Serendipitous Source Catalogue
• 1ES 1927+654: Persistent and rapid X-ray variability in an AGN with low intrinsic neutral X-ray absorption and narrow optical emission lines
• The Difference in Narrow Fe KαLine Emission Between Seyfert 1 and Seyfert 2 Galaxies
• Iron K alpha line profiles and the inner boundary condition of accretion flows
• A stochastic propagation model to the energy dependent rapid temporal behaviour of Cygnus X-1 as observed by AstroSat in the hard state
• Nustar Measurement Of Coronal Temperature In Two Luminous, High Redshift Qsos
• Spectral and Timing Properties of the Galactic X-ray transient Swift~J1658.2--4242 using Astrosat Observations
• Unveiling the temporal properties of MAXI J1820+070 through AstroSat observations
• NuSTAR observation of Ark 564 reveals the variation of coronal temperature with flux
• Broadband Spectral and Timing Properties of MAXI J1348-630 using AstroSat and NICER Observations
• BeppoSAX Observations of the Seyfert-2 Galaxies NGC 7172 and ESO 103-G35
• BeppoSAX Observations of the Maser Sy2 Galaxy: ESO103-G35
• Coronal temperatures of the AGN ESO 103-035 and IGR 2124.7+5058 from NuSTAR observations
• X-ray variability of AGN and correlations with spectral properties

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