Extending the Eigenvector 1 Space to the Optical Variability of Quasars

Details Extending the Eigenvector 1 Space to the Optical Variability of Quasars Extending the Eigenvector 1 Space to the Optical Variability of Quasars

2009-04-26

arxiv.org/abs/0904.4031v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages, 4 figures

Scientific paper

10.1088/1674-4527/9/5/004

We introduce a new physical parameter, the optical variability amplitude, to the well-established Eigenvector 1 space of quasars and test a sample of long-term B-band light curves of 42 PG quasars monitored by Giveon et al. (1999). We find that the optical variability amplitude strongly correlates with the intensity ratio of Fe II to H$\beta$, H$\beta$ width and peak luminosity at 5007$\rm{\AA}$. We briefly discuss the physical meaning of our findings and suggest that the Eddington ratio may be a key factor in determining a quasar's variability.

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