An outflow in the Seyfert ESO 362-G18 revealed by Gemini-GMOS/IFU observations

Abstract

We present two-dimensional stellar and gaseous kinematics of the inner 0.7 × 1.2 kpc 2 of the Seyfert 1.5 galaxy ESO 362-G18, derived from optical (4092-7338 Å) spectra obtained with the GMOS integral field spectrograph on the Gemini South telescope at a spatial resolution of ≈170 pc and spectral resolution of 36 km s −1 . ESO 362-G18 is a strongly perturbed galaxy of morphological type Sa or S0/a, with a minor merger approaching along the NE direction. Previous studies have shown that the [O iii] emission shows a fan-shaped extension of ≈ 10 to the SE. We detect the [O iii] doublet, [N ii] and Hα emission lines throughout our FOV. The stellar kinematics is dominated by circular motions in the galaxy plane, with a kinematic position angle of ≈137 • and is centred approximately on the continuum peak. The gas kinematics is also dominated by rotation, with kinematic position angles ranging from 122 • to 139 • , projected velocity amplitudes of the order of 100 km s −1 , and a mean velocity dispersion of 100 km s −1 . A double-Gaussian fit to the [O iii]λ5007 and Hα lines, which have the highest signal to noise ratios of the emission lines, reveal two kinematic components: (1) a component at lower radial velocities which we interpret as gas rotating in the galactic disk; and (2) a component with line of sight (LOS) velocities 100-250 km s −1 higher than the systemic velocity, interpreted as originating in the outflowing gas within the AGN ionization cone. We estimate a mass outflow rate of 7.4 × 10 −2 M yr −1 in the SE ionization cone (this rate doubles if we assume a biconical configuration), and a mass accretion rate on the supermassive black hole (SMBH) of 2.2 × 10 −2 M yr −1 . The total ionized gas mass within ∼84 pc of the nucleus is 3.3 × 10 5 M ; infall velocities of ∼34 km s −1 in this gas would be required to feed both the outflow and SMBH accretion.

Near-infrared observations of the gas structure and kinematics in the circumnuclear region of NGC 1672

“…Given the uncertainties, we only conclude that the mass of central SMBH is of the order of several 10 7 M , which is a typical mass for SMBHs in nearby galaxies (e.g. Greene & Ho 2005;Busch et al 2017;Humire et al 2018;Slater et al 2019;Fazeli et al 2019).…”

Searching for ultra-fast outflows in AGN using variability spectra

“…ESO 362-G18 is classed as a non-detection as only the Ar xviii feature is a prominent variability feature and the relatively high overall significance is merely due to inaccurate spline fitting. Humire et al (2018) does report on 100-250 km s −1 outflowing gas within the AGN ionization cone, however, these are much below the 0.033c velocity limit to be considered UFOs.…”

Outflowing gas in a compact ionization cone in the Seyfert 2 galaxy ESO 153-G20

“…In order to better understand the extent, geometry, kinematics and energetics of the narrow-line region (NLR) on ≤100-pc scales in a well-defined sample of nearby AGNs, we have been pursuing highresolution integral field unit (IFU) observations of (∼30) Seyfert galaxies from the Hubble Space Telescope (HST) [O III] Snapshot Survey of Schmitt et al (2003) selected to (a) have NLRs that extend beyond ∼1 arcsec from the nucleus, and (b) cover the full range (39 ≤ log (L[O III]) ≤ 42 erg s −1 ) of AGN luminosities of the sample. Results on individual or subsets of galaxies can be found in Schnorr-Müller et al (2014a,b), Riffel, Storchi-Bergmann & Riffel (2015), Lena et al (2016), Finlez et al (2018), Humire et al (2018), Freitas et al (2018), Slater et al (2019), Muñoz-Vergara et al (2019) and Ramakrishnan et al (2019), and overall results of the study will be published on completion of the sample. As part of this study, we observed ESO 153-G20 with the IFU of the Gemini multi-object spectrograph (GMOS-IFU).…”