University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Friday, March 25th 2016
2:30 pm:
Speaker: Wlodek Kluzniak, Copernicus Astronomical Center, Warsaw
Subject: High frequency luminosity variations in accreting black holes

Several black holes in our Galaxy are known to accrete matter from their stellar binary companion. Most of these sources are X-ray transients, being luminous during long "outbursts" usually lasting many months. In certain spectral states, some of these sources exhibit two very high frequencies, which are quite stable over the years. In each of the three or four sources where they appear the two frequencies are in a 3:2 ratio, and they scale inversely with the mass of the black hole. The highest known frequency of 450 Hz occurs for a six solar mass black hole. I will discuss some models of these so called high frequency quasi-periodic oscillations (QPOs), and their possible counterparts in supermassive black holes.

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