The Central Kiloparsec of Seyfert Galaxies: Integral-Field Spectroscopy with OASIS

0374219 - ASÚ 2012 US eng C - Konferenční příspěvek (zahraniční konf.)
Stoklasová, Ivana - Ferruit, P. - Emsellem, E. - Jungwiert, Bruno - Pécontal, E. - Sánchez, Sebastián F.
The Central Kiloparsec of Seyfert Galaxies: Integral-Field Spectroscopy with OASIS.
Galaxies in Isolation: Exploring Nature Versus Nurture. San Francisco: Astronomical Society of the Pacific, 2010 - (Verdes-Montenegro, L.), s. 292-292. ASP Conference Series, 421. ISBN 9781583817223.
[Galaxies in Isolation: Exploring Nature Versus Nurture. Granada (ES), 10.05.2009-15.05.2009]
Grant CEP: GA MŠMT(CZ) LC06014
Výzkumný záměr: CEZ:AV0Z10030501
Klíčová slova: active galaxies * galaxy kinematics * spectroscopic observations
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika

We examine the physical conditions of ionised gas in the central kiloparsec(s) of 11 nearby Seyfert galaxies. We map their narrow-line regions with the optical integral-field spectrograph OASIS mounted at CFHT. We model emission-line profiles of 5 forbidden-line doublets and 2 Balmer lines. We present 2D maps of surface brightness in the observed emission lines, diagnostic line intensity ratios, gas kinematics (mean line-of-sight velocity and velocity dispersion), electron density, and interstellar reddening, and we plot spatially resolved spectral-diagnostic diagrams. The gas velocity fields in 80% of the sample exhibit twisted S-shaped isovelocity contours, which are signatures of non-circular orbits and indicate non-axisymmetric gravitational potentials, gas motions out of the galactic plane, or possible outflows and inflows. Based on the kinematic measurements, we identified a possible nuclear ring or radial gas flow in NGC 262 (Mrk 348), not reported before. Eight of the eleven observed objects exhibit strongly asymmetric or multi-component emission-line profiles, in most cases confined to an elongated region passing through the galactic centre, perpendicular to the major axis of emission.
Trvalý link: http://hdl.handle.net/11104/0207188