University of Cambridge > Talks.cam > Institute of Astronomy Seminars > Hungry black holes - tidal disruption of stars in the nuclei of galaxies in OGLE and Gaia surveys.

Hungry black holes - tidal disruption of stars in the nuclei of galaxies in OGLE and Gaia surveys.

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There are super massive black holes in the centres of probably all galaxies. While the consumption of matter by the larger ones is easy detectable as X-ray and optical variability, the black holes with masses smaller than 10 million suns are typically on a diet. However, occasionally a lost star wanders too close to the black hole and is tidally disrupted, emitting a transient bright flare. So far, about few dozens of such events were detected both in X-rays and optical bands. I will present first results of search for optical flares in OGLE and Gaia transient surveys and discuss the link between quiescent black holes and, so called, “Changing-Look” QSOs.

This talk is part of the Institute of Astronomy Seminars series.

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