Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.287..641n&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 287, Issue 3, pp. 641-650.
Astronomy and Astrophysics
Astronomy
7
Methods: Data Analysis, Galaxies: Active, Galaxies: Nuclei, Gamma-Rays: Theory
Scientific paper
Optical and gamma-ray properties of a sample of active galactic nuclei monitored at the Rosemary Hill Observatory are analysed using cluster analysis. Cluster analysis can be used to analyse large amounts of data with many variables and investigate linear or non-linear relationships in the data. It is found that the time-scale of variation is not related to the amplitude of variability. For BLLacs and optically violent variable (OVV) quasars the variability is proportional to the redshift and absolute magnitude, but this is not true for quasars in this sample. The analysis shows that gamma-ray-loud AGN tend to be associated with superluminal sources with OVV-like characteristics. The gamma-ray fluxes, for both OVV quasars and BLLacs, are proportional to the apparent transverse velocity, and this may point to beaming as the dominant cause for the gamma-ray flux. A large majority of the OVV quasars that display a large amplitude of variability are gamma- ray-loud, but this is not true for BL Lacs.
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