Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-19
Astrophys.J.638:106-119,2006
Astronomy and Astrophysics
Astrophysics
35 pages, 9 figures, accepted by ApJ
Scientific paper
10.1086/498667
The well-documented E1 relationships are first extended to infrared color $\alpha(60,25)$ and flux ratio [OIII]/H$\beta_{\rm{n}}$ by comparing emission line properties to continuum properties in infrared wavelength. Both direct correlations and a principle component analysis are used in a sample of 50 IRAS IR-selected Seyfert 1.5 galaxies. In addition to confirm the correlations of E1 in Boroson & Green (1992), our Eigenvector 1 turns out to be dominated by mid-infrared color $\alpha$(60,25), and most strongly effected by RFe, [OIII]/H$\beta_{\rm{n}}$, and EW(H$\beta_{\rm{b}}$). Our analysis indicate that the objects with large E1 tend to co-existent with relatively young nuclear stellar populations, which implies that the E1 is related with nuclear starformation history. The IR-dominated Eigenvector 1 can be, therefore, inferred to be interpreted as ``age'' of AGN. In confirmation of Xu et al. (2003), it is clear that the extreme Seyfert galaxies with both large RFe and large [OIII]/H$\beta_{\rm{n}}$ are rare in our Universe.
He Xian-Tu
Wang Jeffrey
Wei Jian-Yan
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