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Stellar Populations and Kinematics in Seyfert Galaxies

Published online by Cambridge University Press:  01 August 2006

N. V. Asari ,
L. R. Vega ,
A. Garcia-Rissmann ,
R. M. González Delgado ,
T. Storchi-Bergmann  and
R. Cid Fernandes Jr.
N. V. Asari
Affiliation:
Universidade Federal de Santa Catarina, Brazil
L. R. Vega
Affiliation:
Observatorio Astronómico de Córdoba, Argentina
A. Garcia-Rissmann
Affiliation:
Laboratório Nacional de Astrofísica, Brazil
R. M. González Delgado
Affiliation:
Instituto de Astrofísica de Andalucía, Spain
T. Storchi-Bergmann
Affiliation:
Universidade Federal do Rio Grande do Sul, Brazil
R. Cid Fernandes Jr.
Affiliation:
Universidade Federal de Santa Catarina, Brazil
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Abstract

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Our aim is to study the stellar kinematics in hosts of AGN. We do so by measuring nuclear stellar velocity dispersions (σ⋆). Our sample comprises spectra of 78 objects, 69 of which are Seyfert galaxies, in the region around the λλ8498.02, 8542.09, 8662.14 Calcium triplet (CaT). We investigate two methods to measure σ⋆: (1) the direct fitting method (DFM), which makes use of our stellar population synthesis code Starlight, and (2) the cross-correlation method (CCM), for which we use the fxcor package in IRAF. Both methods yield velocity dispersions consistent to within 19 km/s on-average. We have also measured the CaT equivalent width (WCaT) and the λ3933 CaII K equivalent width (WK) for the objects in our sample. Other studies have shown that WK is a powerful tracer of starbursts in Seyfert nuclei, so we check if WCaT can be used in the same way. We have also analysed a sub-sample of 34 spatially resolved objects with reasonably good off-nuclear signal-to-noise. We study the spatial variations of both σ⋆ and WCaT. We see no dilution in WCaT for composite starburst + Seyfert 2 galaxies, in contrast to the dilution in the WK (studied by other authors) for the same objects.

Keywords

Galaxies: activegalaxies: kinematics and dynamicsgalaxies: Seyfertgalaxies: statisticsgalaxies: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 71 - 75
Copyright
Copyright © International Astronomical Union 2007

References

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