Variable mass accretion and failed wind explain changing look phenomena in NGC 1365

Abstract

Changing look active galactic nuclei (CLAGNs) show complex nature in their X-ray spectral shape and line of sight column density variation. The physical mechanisms responsible for these variations are unclear. Here, we study the spectral properties of a CLAGN, NGC\,1365 using combined {\it XMM-Newton} and {\it NuSTAR} observations to understand the CL behavior. The model fitted mass accretion rate varied between $0.003\pm 0.001$ and $0.009\pm 0.002$ ${\dot{M}}_{\mathrm{Edd}}$ and the dynamic corona changed from $28\pm 3$ to $10\pm 1$ $r_g$. We found that the variable absorption column density correlates with the mass accretion rate and the geometry of the corona. The derived wind velocity was sufficiently low compared to the escape velocity to drive the wind away from the disc for the epochs when column densities were high. This suggests that the high and variable absorption can be due to failed winds from the disc. Our estimated ratio of mass outflow to inflow rate from the inner region of the disc lies between $0.019\pm 0.006$ and $0.12\pm 0.04$. From spectral fitting of the combined data, we found the mass of the central black hole to be constant $4.38\pm 0.34-4.51\pm 0.29\times 10^6{M}_{\odot }$, consistent with earlier findings. The confidence contours of $N_H$ with other model parameters show that the model fitted parameters are robust and non-degenerate. Our study construed that the changing accretion rate, which is a fundamental physical quantity and the geometry of the corona driving the CL phenomena in NGC\,1365. The physical picture considered in this work connects both variable continuum and variable absorbing medium scenarios.

8 pages, 7 figures, 1 table, accepted for publication in A&A, comments welcome

References in corpus (23)

• The Discovery of the First "Changing Look" Quasar: New Insights into the Physics & Phenomenology of AGN
• A fast and long-lived outflow from the supermassive black hole in NGC 5548
• AGN Type-casting: Mrk 590 No Longer Fits the Role
• Ionized outflows from active galactic nuclei as the essential elements of feedback
• The destruction and recreation of the X-ray corona in a changing-look Active Galactic Nucleus
• Mid-infrared variability of changing-look AGN
• The Close AGN Reference Survey (CARS) - Mrk 1018 returns to the shadows after 30 years as a Seyfert 1
• NuSTAR and XMM-Newton Observations of NGC 1365: Extreme Absorption Variability and a Constant Inner Accretion Disk
• Iron K and Compton hump reverberation in SWIFT J2127.4+5654 and NGC 1365 revealed by NuSTAR and XMM-Newton
• Polarization of changing-look quasars
• An Obscured, Seyfert-2-like State of the Stellar-mass Black Hole GRS 1915+105 Caused by Failed Disk Winds
• The Multi-Layer Variable Absorbers in NGC 1365 Revealed by XMM-Newton and NuSTAR
• The picture of BLR in 2.5-D FRADO: Dynamics & Geometry
• NGC 1365: A low column density state unveiling a low ionization disk wind
• Changing-look event in NGC 3516: continuum or obscuration variability?
• Long Term Wind-Driven X-Ray Spectral Variability of NGC 1365 with Swift
• Near-infrared observations of star formation and gas flows in the NUGA galaxy NGC 1365
• The Nuclear Region of NGC1365: Star Formation, Negative Feedback, and Outflow Structure
• Spectral signatures of dissipative standing shocks and mass outflow in presence of Comptonization around a black hole
• Spectral properties of NGC 4151 and the Estimation of black hole mass using TCAF solution
• Changing Accretion Geometry of Seyfert 1 Mrk 335 with {\it NuSTAR}: A Comparative Study
• X-ray narrow emission lines from the nuclear region of NGC 1365
• Spectral signature of mass outflow in Two Component Advective Flow Paradigm

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