Coronal Line Forest AGN I: physical properties of the emission-line regions

Abstract

Coronal-Line Forest Active Galactic Nuclei (CLiF AGN) are characterized by strong high-ionization lines, which contrast to what is found in most AGNs. Here, we carry out a multiwavelength analysis aimed at understanding the physical processes in the Narrow Line Region (NLR) of these objects and unveiling if they are indeed a special class of AGN. By comparing coronal emission-line ratios we conclude that there are no differences between CLiF and non-CLiF AGNs. We derive physical conditions of the narrow line region (NLR) gas and found electron densities in the range $3.6\times$10${}^2$ - $1.7\times$10${}^4$ cm${}^{-3}$ and temperatures of $3.7\times$10${}^3$ - $6.3\times$10${}^4$ K, suggesting that the ionization mechanism is associated primarily with photoionization by the AGN. We suggest a NLR dominated by matter-bounded clouds to explain the high-ionization line spectrum observed. The mass of the central black hole, derived from the stellar velocity dispersion show that most of the objects have values in the interval 10${}^{7-8}$~M$\odot$. Our results imply that CLiF AGN is not a separate category of AGNs. In all optical/near-infrared emission-line properties analyzed, they represent an extension to the low/high ends of the distribution within the AGN class.

30 pages, 25 figures, to be published in MNRAS

References in corpus (18)

• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• The AGN Black Hole Mass Database
• A 0.8-2.4 microns spectral atlas of Active Galactic Nuclei
• AGN Type-casting: Mrk 590 No Longer Fits the Role
• Spitzer Uncovers Active Galactic Nuclei Missed by Optical Surveys in 7 Late-type Galaxies
• Probing the near infrared stellar population of Seyfert galaxies
• Outflows of very ionized gas in the center of Seyfert galaxies: kinematics and physical conditions
• BAT AGN Spectroscopic Survey - IV: Near-Infrared Coronal Lines, Hidden Broad Lines, and Correlation with Hard X-ray Emission
• New changing look case in NGC 1566
• NTT, Spitzer and Chandra spectroscopy of SDSSJ095209.56+214313.3: the most luminous coronal-line supernova ever observed, or a stellar tidal disruption event ?
• The Nuclear Near-Infrared Spectral Properties of Nearby Galaxies
• Coronal-Line Forest AGN: the best view of the inner edge of the AGN torus?
• Powerful outflows in the central parsecs of the low-luminosity Active Galactic Nucleus NGC 1386
• Emission Line Properties of Seyfert Galaxies in the 12 Micron Sample
• Variability of the coronal line region in NGC 4151
• The complex, dusty narrow-line region of NGC 4388: Gas-jet interactions, outflows, and extinction revealed by near-IR spectroscopy
• Intermediate Inclinations of Type 2 Coronal-Line Forest AGN
• Obscured Narrow-Line Seyfert 1 Galaxy Candidate Mrk 1388 with Nonthermal Jets

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