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Inner polar ionized-gas disks and properties of their host galaxies

Published online by Cambridge University Press:  09 February 2015

Olga K. Sil'chenko
Olga K. Sil'chenko*
Affiliation:
Sternberg Astronomical Institute, Lomonosov Moscow State University, University av. 13, 119991 Moscow, Russia email: olga@sai.msu.su
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Abstract

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I have analyzed line-of-sight velocity fields of the stellar and ionized-gas components for the volume-limited sample of nearby lenticular galaxies by using the raw data of the ATLAS-3D survey undertaken with the integral-field spectrograph SAURON. Among 200 nearby lenticular galaxies, I distinguish 20 cases of nearly orthogonal rotation of the inner ionized gas with respect to the central stellar components; so I estimate a frequency of the inner polar disks in nearby S0 galaxies as 10%. Properties of the central stellar populations – mean ages, metallicities, magnesium-to-iron ratios – are derived through the Lick indices. The typical stellar population properties of the polar-disk host galaxies are exactly the same as the stellar population properties of the complete sample.

Keywords

galaxies: elliptical and lenticularcD - galaxies: evolution - galaxies: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 53 - 56
Copyright
Copyright © International Astronomical Union 2015 

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