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Ionized outflows in local luminous AGN: what are the real densities and outflow rates?

Davies, R, Baron, D, Shimizu, T, Netzer, H, Burtscher, L, de Zeeuw, PT, Genzel, R, Hicks, EKS, Koss, M, Lin, M-Y, Lutz, D, Maciejewski, W, Muller-Sanchez, F, de Xivry, GO, Ricci, C, Riffel, R, Riffel, RA, Rosario, D, Schartmann, M, Schnorr-Muller, A , Shangguan, J, Sternberg, A, Sturm, E, Storchi-Bergmann, T, Tacconi, L and Veilleux, S (2020) Ionized outflows in local luminous AGN: what are the real densities and outflow rates? Monthly Notices of the Royal Astronomical Society, 498 (3). pp. 4150-4177. ISSN 0035-8711

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Abstract

We report on the determination of electron densities, and their impact on the outflow masses and rates, measured in the central few hundred parsecs of 11 local luminous active galaxies. We show that the peak of the integrated line emission in the active galactic nuclei (AGN) is significantly offset from the systemic velocity as traced by the stellar absorption features, indicating that the profiles are dominated by outflow. In contrast, matched inactive galaxies are characterized by a systemic peak and weaker outflow wing. We present three independent estimates of the electron density in these AGN, discussing the merits of the different methods. The electron density derived from the [S II] doublet is significantly lower than that found with a method developed in the last decade using auroral and transauroral lines, as well as a recently introduced method based on the ionization parameter. The reason is that, for gas photoionized by an AGN, much of the [S II] emission arises in an extended partially ionized zone where the implicit assumption that the electron density traces the hydrogen density is invalid. We propose ways to deal with this situation and we derive the associated outflow rates for ionized gas, which are in the range 0.001–0.5 M⊙ yr−1 for our AGN sample. We compare these outflow rates to the relation between ˙M out and LAGN in the literature, and argue that it may need to be modified and rescaled towards lower mass outflow rates.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 08 Jan 2021 10:18
Last Modified: 08 Jan 2021 10:30
DOI or Identification number: 10.1093/mnras/staa2413
URI: https://researchonline.ljmu.ac.uk/id/eprint/14242

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