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 $\times$ 1.2 kpc${}^2$ of the Seyfert galaxy ESO 362-G18, derived from optical spectra obtained with the GMOS/IFU on the Gemini South telescope at a spatial resolution of $\approx$170 pc and spectral resolution of 36 km s${}^{-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 [OIII] emission shows a fan-shaped extension of $\approx$ 10\arcsec\ to the SE. We detect the [OIII] doublet, [NII] and H$\alpha$ emission lines throughout our field of view. The stellar kinematics is dominated by circular motions in the galaxy plane, with a kinematic position angle of $\approx$137${}^{\circ }$. The gas kinematics is also dominated by rotation, with kinematic position angles ranging from 122${}^{\circ }$ to 139${}^{\circ }$. A double-Gaussian fit to the [OIII]$\lambda$5007 and H$\alpha$ 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 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 $\times$ 10${}^{-2}$ M${}_{\odot }$ 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 $\times$ 10${}^{-2}$ M${}_{\odot }$ yr${}^{-1}$. The total ionized gas mass within $\sim$84 pc of the nucleus is 3.3 $\times$ 10${}^5$ M${}_{\odot }$; infall velocities of $\sim$34 km s${}^{-1}$ in this gas would be required to feed both the outflow and SMBH accretion.

arXiv comment18 pages, 14 figures

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