1. An outflow in the Seyfert ESO 362-G18 revealed by Gemini-GMOS/IFU observations.
- Author
-
Humire, Pedro K., Nagar, Neil M., Finlez, Carolina, Firpo, Verónica, Slater, Roy, Lena, Davide, Soto-Pinto, Pamela, Muñoz-Vergara, Dania, Riffel, Rogemar A., Schmitt, Henrique R., Kraemer, Steven B., Schnorr-Müller, Allan, Fischer, Travis C., Robinson, Andrew, Storchi-Bergmann, Thaisa, Crenshaw, Mike, and Elvis, Martin S.
- Subjects
SEYFERT galaxies ,ASTRONOMICAL perturbation ,ASTRONOMICAL observations ,INTEGRAL field spectroscopy ,GAUSSIAN function - Abstract
We present two-dimensional stellar and gaseous kinematics of the inner 0.7 × 1.2 kpc2 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 field of view. 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 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 × 10−2M⊙ 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 × 10−2M⊙ yr−1. The total ionized gas mass within ~84 pc of the nucleus is 3.3 × 105M⊙; infall velocities of ~34 km s−1 in this gas would be required to feed both the outflow and SMBH accretion. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF