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Author |
|
| Name | Dermer, Charles |
| Research field | Physics and Astronomy |
| Career stage | professor |
| Home university/institution | George Mason University |
| Department/Research unit at home university/institution | - |
| Chair/Working group at home institution | - |
International activity |
|
| Country | Germany |
| Location | Bochum |
| University | Ruhr-Universität Bochum (RUB) |
| Fund Research School | VIP |
| Type of activity | research stay |
| Period |
starts 01-01-2016 ends 31-12-2018 |
| Keywords | - |
| Report |
Project description Blazars are compact powerful objects from the edge of the universe. Blazars are a subclass of active galactic nuclei with high-energy photon emission from its relativistic jet preferentially aligned to the observer's line of sight. The new generation of air Cherenkov TeV-ray telescopes (HESS, MAGIC, VERITAS) have detected about 30 cosmological blazars with strong TeV photon emission. Modeling this powerful nonthermal photon emission from the relativistic jet still remains a challenge for high-energy astrophysics. In the literature hadronic (from interactions of charged high-energy hadrons) and leptonic (from interactions of charged high-energy electrons) emission processes have been discussed. In the past Prof. Dermer has contributed significantly to this modeling, pioneering (together with R. Schlickeiser) on the leptonic external Compton process. Recently, a multiteam collaboration detected a high-energy neutrino event whose arrival direction was consistent with the blazar TXS 0506+056, undergoing a gamma-ray flare. This detection strongly favors the hadronic origin of the photon emision as only in inelastic hadron-hadron and hadron-photon interactions the production of high-energy neutrinos is possible. However, in inelastic hadron-hadron and hadron-photon interactions also secondary electrons and positrons are generated so that hadronic emission models also involve leptonic radiation processes from the secondary electrons and positrons. It is the aim of this project to further develop the hadronic emission models accounting for the contribution from the leptonic radiation processes by the secondary electrons and positrons. 1st Visit, September 2016 1st Visit of Prof. Dermer: Prof. Dermer has been at the Ruhr-University Bochum from September 5, 2016 until September 27, 2016. Besides personal discussions with the hosts and their graduate students Prof. Dermer delivered an one-hour invited talk on "Blazar Modeling and the Minimum-Power Condition in Blazars" at the RAPP-Center Inauguration Workshop from September 21, 2016 until September 23, 2016 in Bochum. This talk was attended by more than 200 researchers mainly from the universities in Bochum, Dortmund and Duisburg-Essen. Future visits As Prof. Schlickeiser retired as full professor in February 2018, future visits of Prof. Dermer have to be planned and coordinated by Prof. Tjus. As Prof. Dermer also strongly pursues his second career as composer and musician of traditional american music he has sofar not been available for a second visit. |