Determining the cosmological parameters from the linewidths of active galaxies

Abstract

We have previously shown that the linewidth distribution in AGN can be accounted for by an axisymmetric broad emission line region. In this paper we show that the linewidth distribution changes with redshift and that these changes are dependent on H_0 and q_0. We show that relatively small samples of AGN at high redshift with measured linewidth at half maximum can be used to distinguish between values of H_0 and q_0. Furthermore larger low redshift samples can be used to distinguish between luminosity functions and hence different models of quasar evolution.

Accepted for publication in MNRAS. 8 pages LaTeX, uses mn.sty

References in corpus (4)

• ASCA observations of Deep ROSAT fields - II. The 2-10keV AGN luminosity function
• Optical and X-ray properties of the RIXOS AGN: II - Emission lines
• The X-ray background and the AGN X-ray luminosity function
• Line width distributions as evidence for axisymmetry in the broad line regions of active galaxies

Cited by in corpus (4)

• Highly Accreting Quasars: Sample Definition and Possible Cosmological Implications
• A new cosmological distance measure using AGN X-ray variability
• Quasar Parallax: a Method for Determining Direct Geometrical Distances to Quasars
• The luminosity dependence of opening angle in unified models of active galaxies