Monitoring Quasar Colour Variability in Stripe 82

Details Monitoring Quasar Colour Variability in Stripe 82 Monitoring Quasar Colour Variability in Stripe 82

2012-03-09

arxiv.org/abs/1203.2162v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

2 pages, 1 figure, The proceedings of the "AGN Winds in Charleston" meeting, Charleston, SC, 15-18 Oct 2011. To be published b

Scientific paper

Broad Absorption Line (BAL) trough variability is predominantly due to cloud motion transverse to our line of sight. The rate at which the variability occurs indicates the velocity of the cloud, which can provide constraints on the cloud's distance from the central source. This requires detailed spectroscopy during a variability event. Such spectra have proven elusive, suggesting either the timescale of variability is too short to be caught, or too long to notice until a sufficient amount of time has passed. Photometric monitoring of BAL quasar colours may potentially be used as an early warning system to trigger time resolved spectroscopic monitoring of BAL variability. Towards this end, we are analyzing both BAL and non-BAL colour variability using time series photometry from Stripe 82 in the Sloan Digital Sky Survey.

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