OASIS integral-field spectroscopy of the central kpc in 11 Seyfert 2 galaxies - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




OASIS integral-field spectroscopy of the central kpc in 11 Seyfert 2 galaxies - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We map narrow-line regions NLRs of 11 nearby Seyfert 2 galaxies with theoptical integral-field spectrograph OASIS mounted at CFHT. We modelemission-line profiles of 5 forbidden-line doublets and 2 Balmer lines,correcting for the underlying stellar absorption by reconstructing stellarspectra with synthetic evolutionary stellar population models. For each of the11 targets, we present 2D maps of surface brightness in the observed emissionlines, diagnostic line intensity ratios, gas kinematics mean line-of-sightvelocity and velocity dispersion, electron density, and interstellarreddening, and we plot spatially resolved spectral-diagnostic diagrams. Thestellar data are represented by maps of mean line-of-sight LOS velocities andof the relative mass fractions of the young stellar populations. The gasvelocity fields in 80% of the sample exhibit twisted S-shaped isovelocitycontours, which are signatures of non-circular orbits and indicatenon-axisymmetric gravitational potentials, gas motions out of the galacticplane, 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 stronglyasymmetric or multi-component emission-line profiles, in most cases confined toan elongated region passing through the galactic centre, perpendicular to themajor axis of emission.



Author: Ivana Stoklasová, Pierre Ferruit, Eric Emsellem, Bruno Jungwiert, Emmanuel Pécontal, Sebastian F. Sánchez

Source: https://arxiv.org/







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