A high spectral resolution map of the nuclear emitting regions of NGC 7582

Abstract

We present the results of the spatial and spectral analysis of the deep (~200 ksec) Chandra HETG observation of the changing look AGN NGC7582. During this observation NGC7582 was in a highly obscured state. Therefore, we considered also a short Suzaku observation, which caught NGC7582 in a Compton thick state. This allows us to determine the underlying continuum and the amount of absorption ($N_H\sim 1.2\times 10^{24}$ cm${}^{-2}$). A wealth of emission lines are detected in the Chandra data, which allow us to map the structure of the circum-nuclear emitters. The high resolution spectrum reveals that the soft X-ray emission originates in a hybrid gas, which is ionized in part by the starforming activity and in part by the central AGN. The high resolution images confirm that the emitting region is inhomogeneous and extends up to a few hundred pc from the nuclear source. The X-ray images are more extended in the lower energy lines (Ne and Mg) than in the higher energy lines (Si, Fe), where the former are dominated by the collisionally ionised gas and the latter by the photoionized AGN emission. This is supported by the analysis of the He-like triplets. We deduce that a low density photoionized gas is responsible for the strong forbidden components, which is likely to originate from extended AGN Narrow Line Region gas at distances of 200-300 pc from the black hole. We also detected an absorption feature at ~ 6.7 keV consistent with the rest frame energy of the resonance absorption line from FeXXV, which traces the presence of a sub-parsec scale ionized absorber. The emerging picture is in agreement with our view of the circumnuclear gas in AGN, where the medium is clumpy and stratified in both density and ionization. These absorbers and emitters are located on different scales: from the sub-pc Broad Line Region gas out to the kpc scale of the galactic absorber.

15 pages, including 9 figures. Accepted for publication in Astronomy & Astrophysics

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• The nuclear regions of NGC 7582 from [NeII] spectroscopy at 12.8 microns - an estimate of the black hole mass
• Search for X-ray occultations in Active Galactic Nuclei
• NGC 1365: A low column density state unveiling a low ionization disk wind
• A multiwavelength map of the nuclear region of NGC7582
• Mapping Seyfert and LINER Excitation Modes in the Inner kpc of NGC 3393
• The Chandra/HETG view of NGC 1365 in a Compton-thick state

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• Investigating Changing-Look Active Galactic Nuclei with Long-term Optical and X-Ray Observations
• The Black Hole-Galaxy Connection: Interplay between Feedback, Obscuration, and Host Galaxy Substructure
• Evidence for a clumpy disc-wind in the star forming Seyfert\,2 galaxy MCG--03--58--007
• Optical and near-infrared IFU spectroscopy of the nuclear region of the AGN-starburst galaxy NGC 7582
• A Systematic Survey for z < 0.04 Changing-Look AGNs
• The X-ray emission of the Seyfert 2 galaxy MCG-01-24-12
• Chasing ICM cooling and AGN feedback from the macro to the meso scales in the galaxy cluster ZwCl 235
• A hard look at the X-ray spectral variability of NGC 7582
• Elucidating the global distribution of reprocessing gas in NGC 1194
• X-ray and CO-Derived Column Densities in AGN: A Study of Obscuration Properties in CTAGN and Non-CTAGN