Joint NuSTAR and Chandra analysis of the obscured quasar in IC 2497 - Hanny's Voorwerp system

Abstract

We present new Nuclear Spectroscopic Telescope Array (NuSTAR) observations of the core of IC 2497, the galaxy associated with Hanny's Voorwerp. The combined fits of the Chandra (0.5-8 keV) and NuSTAR (3-24 keV) X-ray spectra, together with WISE mid-IR photometry, optical longslit spectroscopy and optical narrow-band imaging, suggest that the galaxy hosts a Compton-thick AGN ($N_{\mathrm{H}}\sim 2\times 10^{24}$ cm${}^{-2}$, current intrinsic luminosity $L_{\mathrm{bol}}\sim 2-5\times 10^{44}$ erg s${}^{-1}$) whose luminosity dropped by a factor of $\sim$50 within the last $\sim 100$ kyr. This corresponds to a change in Eddington ratio from ${\lambda }_{\mathrm{Edd}}\sim$ 0.35 to ${\lambda }_{\mathrm{Edd}}\sim$ 0.007. We argue that the AGN in IC 2497 should not be classified as a changing-look AGN, but rather we favour the interpretation where the AGN is undergoing a change in accretion state (from radiatively efficient to radiatively inefficient). In this scenario the observed drop in luminosity and Eddington ratio corresponds to the final stage of an AGN accretion phase. Our results are consistent with previous studies in the optical, X-ray and radio although the magnitude of the drop is lower than previously suggested. In addition, we discuss a possible analogy between X-ray binaries and an AGN.

arXiv comment9 pages, 3 figures. Accepted for publication in MNRAS

References in corpus (61)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Global Schmidt Law in Star Forming Galaxies
• Energy input from quasars regulates the growth and activity of black holes and their host galaxies
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Modeling feedback from stars and black holes in galaxy mergers
• Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars
• Local Supermassive Black Holes, Relics of Active Galactic Nuclei and the X-ray Background
• Galaxy Zoo : Morphologies derived from visual inspection of galaxies from the Sloan Digital Sky Survey
• Modelling the behaviour of accretion flows in X-ray binaries
• Mid-Infrared Selection of Active Galaxies
• Preliminary Results from NEOWISE: An Enhancement to the Wide-field Infrared Survey Explorer for Solar System Science
• Mid-Infrared Selection of AGN with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-Selected AGN in COSMOS
• The Illustris simulation: the evolving population of black holes across cosmic time
• The 2-10 keV luminosity as a Star Formation Rate indicator
• What Drives the Growth of Black Holes?
• How Do Massive Black Holes Get Their Gas?
• An X-ray Spectral Model for Compton-Thick Toroidal Reprocessors
• The XMM-Newton view of PG quasars I. X-ray continuum and absorption
• Chandra X-Ray Observatory (CXO):Overview
• Black Hole Masses and Eddington Ratios at 0.3<z<4
• The Discovery of the First "Changing Look" Quasar: New Insights into the Physics & Phenomenology of AGN
• A Physical Model for the Origin of Quasar Lifetimes
• Black hole variability and the star formation-AGN connection: Do all star-forming galaxies host an AGN?
• On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies
• Resolving the mid-infrared cores of local Seyferts
• Radiatively Inefficient Accretion in Nearby Galaxies
• An XMM-Newton spectral survey of 12 micron selected galaxies. I. X-ray data
• A Systematic Search for Changing-Look Quasars in SDSS
• Compton-thick Accretion in the local Universe
• Galaxy Zoo : 'Hanny's Voorwerp', a quasar light echo?
• Extreme X-ray spectral variability in the Seyfert 2 Galaxy NGC 1365
• Feedback from Central Black Holes in Elliptical Galaxies: Two-dimensional Models Compared to One-dimensional Models
• Black Hole growth and AGN obscuration by instability-driven inflows in high-redshift disk galaxies fed by cold streams
• NuSTAR Observations of the Bullet Cluster: Constraints on Inverse Compton Emission
• The Evolution of Normal Galaxy X-ray Emission Through Cosmic History: Constraints from the 6 Ms Chandra Deep Field-South
• The subarcsecond mid-infrared view of local active galactic nuclei: II. The mid-infrared--X-ray correlation
• AGN Type-casting: Mrk 590 No Longer Fits the Role
• Massive Galaxies in COSMOS: Evolution of Black hole versus bulge mass but not versus total stellar mass over the last 9 Gyrs?
• X-ray Properties of LINERs and Low-luminosity Seyfert Galaxies Observed with ASCA. I. Observations and Results
• On the Unification of Active Galactic Nuclei
• Fuelling Active Galactic Nuclei
• The Cores of the Fe K$\alpha$ Lines in Active Galactic Nuclei: an Extended Chandra High Energy Grating Sample
• A tidal disruption flare in a massive galaxy? Implications for the fuelling mechanisms of nuclear black holes
• iPTF Discovery of the Rapid "Turn On" of a Luminous Quasar
• Simulations of supermassive black hole growth in high-redshift disk galaxies
• The Close AGN Reference Survey (CARS) - Mrk 1018 returns to the shadows after 30 years as a Seyfert 1
• A New Population of Compton-Thick AGN Identified Using the Spectral Curvature Above 10 keV
• AGN Flickering and Chaotic Accretion
• The History and Environment of a Faded Quasar: Hubble Space Telescope observations of Hanny's Voorwerp and IC 2497
• Iron K$\alpha$ emission in type-I and type-II Active Galactic Nuclei
• IC 751: a new changing-look AGN discovered by NuSTAR
• Fading AGN Candidates: AGN Histories and Outflow Signatures
• The Sudden Death of the Nearest Quasar
• The Close AGN Reference Survey (CARS) - What is causing Mrk1018's return to the shadows after 30 years?
• Testing Radiatively-Inefficient Accretion Flow Theory: an XMM-Newton Observation of NGC 3998
• Revealing Hanny's Voorwerp: radio observations of IC 2497
• Deriving the Quasar Luminosity Function from Accretion Disk Instabilities
• Simulated spectral states of AGN and observational predictions
• Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy injection in the gas around a fading AGN
• Black hole growth and AGN feedback under clumpy accretion
• NuSTAR unveils a heavily obscured low-luminosity Active Galactic Nucleus in the Luminous Infrared Galaxy NGC 6286

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