2019MNRAS.489.4111S -
Mon. Not. R. Astron. Soc., 489, 4111-4124 (2019/November-1)
Outflowing gas in a compact ionization cone in the Seyfert 2 galaxy ESO 153-G20.
SOTO-PINTO P., NAGAR N.M., FINLEZ C., RAMAKRISHNAN V., MUNOZ-VERGARA D., SLATER R., HUMIRE P.K., STORCHI-BERGMANN T., LENA D., KRAEMER S.B., FISCHER T.C., SCHMITT H.R., RIFFEL R.A., SCHNORR-MULLER A., ROBINSON A., CRENSHAW D.M. and ELVIS M.S.
Abstract (from CDS):
We present two-dimensional ionized gas and stellar kinematics in the inner 1.4 x 1.9 kpc2 of the Seyfert 2 galaxy ESO 153-G20 obtained with the Gemini-South/Gemini multi-object spectrograph integral field unit (GMOS-IFU) at a spatial resolution of ∼250 pc and spectral resolution of 36 km s–1. Strong [O III], Hα, [N II] and [S II] emission lines are detected over the entire field of view. The stellar kinematics trace circular rotation with a projected velocity amplitude of ±96 km s–1, a kinematic major axis in position angle of 11°, and an average velocity dispersion of 123 km s–1. To analyse the gas kinematics, we used aperture spectra, position-velocity diagrams and single/double Gaussian fits to the emission lines. All lines show two clear kinematic components: a rotating component that follows the stellar kinematics, and a larger-dispersion component, close to the systemic velocity (from which most of the [O III] emission comes), mainly detected to the south-west. We interpret this second component as gas outflowing at ∼400 km s–1 in a compact (300 pc) ionization cone with a half-opening angle <=40°. The counter-cone is probably obscured behind a dust lane. We estimate a mass outflow rate of 1.1 M☉ yr–1, 200 times larger than the estimated accretion rate on to the supermassive black hole, and a kinetic to radiative power ratio of 1.7 x 10–3. Bar-induced perturbations probably explain the remaining disturbances observed in the velocity field of the rotating gas component.
Abstract Copyright:
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
galaxies: active - galaxies: individual: ESO 153-G20 - galaxies: kinematics and dynamics - galaxies: nuclei - galaxies: Seyfert
Simbad objects:
2
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