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dc.contributor.authorPeterson, Bradley M.
dc.date.accessioned2016-11-14T19:20:28Z
dc.date.available2016-11-14T19:20:28Z
dc.date.issued2016-10-31
dc.identifier.urihttp://hdl.handle.net/1853/56020
dc.descriptionPresented on October 31, 2016 at 3:00 p.m. in the Marcus Nanotechnology Building, Room 1117en_US
dc.descriptionBradley M. Peterson is the former Chair (2006-2015) of the Department of Astronomy at The Ohio State University. His research is directed towards determination of the physical nature of active galactic nuclei (AGNs). These are the most luminous discrete sources in the Universe, as bright as an entire giant galaxy of normal stars, but are nevertheless very compact, only about the size of the Solar System. The immediate goal of most of my recent research has been to probe the inner structure of AGNs on the smallest possible scales through studies of continuum and emission-line variability, a process known as "reverberation mapping." Reverberation mapping allows us to measure directly the masses of the black holes at the centers of active galactic nuclei.en_US
dc.descriptionRuntime: 59:18 minutesen_US
dc.description.abstractThe innermost structure of active galactic nuclei (AGNs) consists of an accretion disk surrounding a supermassive black hole and, on somewhat larger scales, rapidly moving diffuse gas. The ultraviolet through near IR spectrum of AGNs is dominated by thermal continuum emission from the accretion disk and broad emission lines and absorption features from the diffuse gas. The continuum flux from the accretion disk varies with time, and the emission lines also change in brightness, or “reverberate,” in response to these variations, with a delay due to the light-travel time across the line-emitting region. Measurement of the emission-line time delay yields the size of the line-emitting region and by combining this with the emission-line Doppler width, the central black hole mass can be inferred. I will discuss results from recent “reverberation mapping” experiments, including a 179-orbit HST Cycle 21 program, that have been designed to explore the dynamics of the emission-line gas and are yielding a wealth of new and quite surprising information about AGN structure.en_US
dc.languageEnglishen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.relation.ispartofseriesPhysics Public Lecture Seriesen_US
dc.subjectAGN structureen_US
dc.subjectBlack holeen_US
dc.subjectDoppleren_US
dc.subjectHST cycle 21en_US
dc.titleExploring the Inner Structure of Active Galactic Nuclei by Reverberationen_US
dc.typeLectureen_US
dc.typeVideoen_US
dc.contributor.corporatenameGeorgia Institute of Technology. School of Physicsen_US
dc.contributor.corporatenameOhio State University. Dept. of Astronomyen_US


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