Eigenvector 1: an H-R diagram for AGN?

Details Eigenvector 1: an H-R diagram for AGN? Eigenvector 1: an H-R diagram for AGN?

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001msngr.104...25s&link_type=abstract

The Messenger, vol. 104, p. 25-28

Physics

3

Scientific paper

Observations with 1.5-m-class ESO telescopes have contributed significantly to a much clearer understanding of the phenomenology of Active Galactic Nuclei (AGN) that has emerged over the past seven years. Long-slit spectra of good resolution and high s/n enable us to accurately measure emission-line parameters for a significant number of AGN. Combined with soft X-ray and UV line measures from Hubble Space Telescope, the data reveal a parameter space that distinguishes between the diverse classes of AGN and organises them in a way that promises to redefine the input to physical models. We suggest that this Eigenvector 1 (E1) parameter space may be as close as we will ever come to finding an H-R diagram for quasars. Several arguments suggest that the ratio of AGN luminosity to black hole mass (L/M accretion rate) convolved with the effects of source orientation drives the principal E1 correlation. While L/M sustains, in a sense, the H-R analogy beyond phenomenology, the role of orientation reflects the greater complexity inherent in the lack of spherical symmetry for AGN.

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