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Colloquium by Yue Shen (KIAA-PKU)

Understanding the inner structure of quasars: from phenomenology to reverberation mapping

Abstract:  Broad-line quasars display a remarkable regularity in their diverse multi-wavelength properties, following a well-defined physical sequence called "Eigenvector 1" discovered by Boroson and Green two decades ago. In the first half of my talk, I will discuss how these diverse quasar properties can be utilized to understand the structure and physics of quasars. New work using large survey data demonstrates that the diversity and regularity of quasar phenomena can be unified by two simple quantities of Eddington ratio and orientation, shedding light on the anisotropic geometry of the broad-line region. In the second half of my talk, I will introduce the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project, a dedicated multi-object RM program to measure distances (time lags) from the broad-line region and dust torus to the black hole. I will present some early science results from SDSS-RM, and demonstrate how this endeavor will advance our knowledge of the inner structure of quasars and improve their BH mass measurements.

Time: Feb. 18, 2015, 2:30 pm

Venue: A601, NAOC