Stellar population gradients in Seyfert 2 galaxies
Abstract
We study the variation of the stellar population properties as a function of distance from the nucleus for a sample of 35 Seyfert 2 galaxies using the technique of stellar population synthesis. We sample regions at the galaxies with dimensions in the range 200 x 200 to 400 x 400 pc and compare the synthesis results with those of a control sample of non-Seyfert galaxies. We find that both at the nucleus and up to 3 kpc from it the oldest age component (10 Gyr) presents a smaller contribution to the total flux in the Seyfert than in the non-Seyfert galaxies of the same Hubble type, while the components younger than 100 Myr present a larger contribution in the Seyfert's than in non-Seyferts. In addition, while for the non-Seyferts clear gradients are present, in which the contribution of the oldest components decrease with distance from the nucleus and the contribution of the 1 Gyr component increases -- we do not find such gradients in most Seyferts. These results suggest that the AGN-starburst connection is a large scale phenomenon affecting not only the inner few hundred parsecs, but the inner kiloparsecs.
Keywords
Cite
@article{arxiv.astro-ph/0211474,
title = {Stellar population gradients in Seyfert 2 galaxies},
author = {Thaisa Storchi-Bergmann and Daniel I. Raimann and R. Gonzalez Delgado and H. R. Schmitt and R. Cid Fernandes and T. Heckman and Claus Leitherer},
journal= {arXiv preprint arXiv:astro-ph/0211474},
year = {2007}
}
Comments
6 pages, 3 figures, to appear in the proceedings of the conference Star Formation through Time, Granada, Sep. 2002, ASP, Eds. Perez, Gonzalez Delgado and Tenorio Tagle