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The Evolution Sequence in Narrow-Line and Broad-Line SEYFERT 1 Galaxies

Published online by Cambridge University Press:  21 February 2013

Y. Z. Wu  and
S. N. Zhang
Y. Z. Wu
Affiliation:
Institute of High Energy Physics, Chinese Academy of Sciences, email: [email protected]
S. N. Zhang
Affiliation:
Institute of High Energy Physics, Chinese Academy of Sciences, email: [email protected] National Astronomical Observatories, Chinese Academy of Sciences, email: [email protected]
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Abstract

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Collecting a sample of 50 narrow-line Seyfert 1 galaxies (NLS1s) and 44 broad-line Seyfert 1 galaxies (BLS1s), we show that the theoretical maximum starburst line derived by Kewley et al. can separate well BLS1s from NSL1s on the BPT diagrams, and the [N II]λ 6584/Hα ratio increases along the list from NLS1s to BLS1s. We suggest that: (1) they have a sequence from low metallicities to high metallicities between NLS1s and BLS1s; (2) with regard to the “star-froming sequence” of Kewley et al. who noted that it forms a tight sequence from low metallicities to high metallicities, the sequence may be connected to the NLS1-BLS1 sequence of “active galactic nucleus (AGN)” sequences.

Keywords

Galaxies: active — galaxies: Seyfert — galaxies: statistics.
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 343 - 344
Copyright
Copyright © International Astronomical Union 2013

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