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The complex gas kinematics in the nucleus of the Seyfert 2 galaxy NGC 1386 : rotation, outflows, and inflows

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The complex gas kinematics in the nucleus of the Seyfert 2 galaxy NGC 1386 : rotation, outflows, and inflows

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Título The complex gas kinematics in the nucleus of the Seyfert 2 galaxy NGC 1386 : rotation, outflows, and inflows
Autor Lena, Davide
Robinson, Andrew
Storchi-Bergmann, Thaisa
Müller, Allan Schnorr
Seelig, T.
Riffel, Rogemar André
Nagar, Neil M.
Couto, Guilherme dos Santos
Shadler, l
Abstract We present optical integral field spectroscopy of the circum-nuclear gas of the Seyfert 2 galaxy NGC 1386. The data cover the central 7″ × 9″ (530 × 680 pc) at a spatial resolution of 0″. 9 (68 pc), and the spectral range 5700–7000 Å at a resolution of 66 km s−1. The line emission is dominated by a bright central component, with two lobes extending ≈3″ north and south of the nucleus. We identify three main kinematic components. The first has low velocity dispersion ( ¯ σ ≈ 90 km s−1), extends over the whole field of view, and has a velocity field consistent with gas rotating in the galaxy disk. We interpret the lobes as resulting from photoionization of disk gas in regions where the active galactic nucleus radiation cones intercept the disk. The second has higher velocity dispersion ( ¯ σ ≈ 200 km s−1) and is observed in the inner 150 pc around the continuum peak. This component is double peaked, with redshifted and blueshifted components separated by ≈500 km s−1. Together with previous Hubble Space Telescope imaging, these features suggest the presence of a bipolar outflow for which we estimate a mass outflow rate of M˙ ≳ 0.1 M⊙ yr−1. The third component is revealed by velocity residuals associated with enhanced velocity dispersion and suggests that outflow and/or rotation is occurring approximately in the equatorial plane of the torus. A second system of velocity residuals may indicate the presence of streaming motions along dusty spirals in the disk.
Contido em The astrophysical journal. Bristol. Vol. 806, no. 1 (June 2015), 84, 22 p.
Assunto Acreção
Buracos negros
Fotoionizacao
Galáxia NGC 1386
Galaxias seyfert
Nucleo galatico
[en] Black hole physics
[en] Galaxies: active
[en] Galaxies: individual (NGC 1386)
[en] Galaxies: kinematics and dynamics
[en] Galaxies: nuclei
[en] Galaxies: Seyfert
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/126989
Arquivos Descrição Formato
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