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Lehrstuhl für Astronomie

AG Mannheim · AG Kadler· AG Dröge

AG Kadler - Multiwavelength Astronomy

Prof. Dr. Matthias Kadler, Universität Würzburg

 

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Till Steinbring


Email: tsteinbring@astro.uni-wuerzburg.de

Phone: +49931/3186887

till_steinbring 

 

Research

 

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My topic and interest of research is about phenomena occurring at the innermost part of active galactic nuclei. To be more precise, I am interested in the role of the angular momentum for the jet formation. According to the mechanism first described by Blandford and Znajek (1977) the jet power only depends on the angular momentum of the central black hole, its mass and the magnetic field strength. This formula might well hold for blazars, where we do not observe any strong accretion ongoing. To observationally verify that the jet of those sources might be dominantly driven by the extraction of rotational energy and to determine the Kerr parameter of the central black hole, is a major part of my research. For that purpose I study the broadband spectral energy distribution to determine the relevant parameters on parsec scales. In addition the study of VLBI radio data, where sub parsec scales are resolved, provide a unique possibility to constrain the geometry of the jet. This allows us to determine the gradients of physical parameters along the jet axis, such as the electron energy density or the magnetic field strength and we can scale them down to the ergosphere.

Besides the study of gradients of physical parameters and deviations from a simple power law such as excesses in the brightness temperature strongly constrains the jet models we use such as e.g. a model based on the one by Königl (1981).  RESEARCH PIC!!!

 

Collaborations

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Publications

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Experience

  • 2010 - present: Teaching assistant Introduction into Astronomy, Astronomy Laboratory course, Physics of atmospheres, Laboratory course (undergraduates)

 

Education

 

  • 2013 - present: Ph.D. candidate, University of Wuerzburg (Scholarship holder of the GRK 1147)
  • 2012: M. Sc. in physics (Topic of my thesis: Determination of the Kerr parameter of the central Black Hole in BL Lacertae objects), University of Wuerzburg
  • 2010: B. Sc. in physics (Topic of my thesis: Synchrotron radiation from electrons and positrons as products of the annihilation of weakly interacting dark matter), University of Wuerzburg