Daily Update; BAL EW vs. time for transverse motion

Finished & sent note to Fred Hamann about arXiv:1008.3728. Finished one last task for grant report.

An idea inspired by Guido Risaliti's recent OSU colloquium: if you have BAL region "clouds" which are rotating in the same sense as the accretion disk, and if the accretion disk follows the Hubeny et al. models where the rotationally approaching half of the disk is brighter than the receding half, you might be able to verify those models by looking at BAL EWs vs. time. (Assuming also that the transverse motion of the BAL is dominated by rotation.) As a BAL cloud first moves in front of the disk, the absorption EW should increase rapidly, as the part of the disk being covered is the bright, approaching half. In other words, for an absorber gradually covering the whole continuum source, a depth halfway to maximum absorption should be reached in less than half the time to maximum absorption (equivalently, at half the time to maximum absorption, the depth will be more than halfway to maximum). For a BAL cloud moving out of our LOS to the continuum source, from complete covering to zero covering, the recovery to continuum will happen faster in the 1st half of the uncovering timescale than in the 2nd half.