Outflowing gas in a compact ionization cone in the Seyfert 2 galaxy ESO 153-G20
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Fecha
2019-11-01
Autores
Soto-Pinto, Pamela
Nagar, Neil M.
Finlez, Carolina
Ramakrishnan, Venkatessh
Munoz-Vergara, Dania
Slater, Roy
Humire, Pedro K.
Storchi-Bergmann, Thaisa
Lena, Davide
Kraemer, Steven B.
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Monthly Notices of the Royal Astronomical Society
Nombre de Curso
Licencia CC
Attribution 4.0 International (CC BY 4.0)
Licencia CC
Resumen
We present two-dimensional ionized gas and stellar kinematics in the inner 1.4 × 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 kms-1. Strong [O III], Hα, [NII] 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/doubleGaussian 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 [OIII] 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 × 10-3. Bar-induced perturbations probably explain the remaining disturbances observed in the velocity field of the rotating gas component.
Notas
Indexación Scopus
Palabras clave
Galaxies: Active, Galaxies: Individual: ESO 153-G20, Galaxies: Kinematics and dynamics, Galaxies: Nuclei, Galaxies: Seyfert
Citación
Monthly Notices of the Royal Astronomical Society Volume 489, Issue 3, Pages 4111 - 4124 1 November 2019
DOI
10.1093/mnras/stz2333