MPI for Extraterrestrial Physics
jdexter at mpe.mpg.de
Office X5 1.3.45
+49 89 30000 3324
Moving to CU Boulder and JILA Fall 2019!
I will start a faculty position at the University of Colorado in fall 2019. As part of the astrophysics theory group in JILA, we are advertising postdoctoral fellowship positions this year: ad here. Please contact me if you are interested in these positions. I will also be recruiting graduate students through the Astrophysical and Planetary Sciences department. More information here.
I am an astrophysicist in the infrared/submillimeter group at the Max Planck Institute for Extraterrestrial Physics in Garching (near Munich), Germany. My work focuses on the observational properties of gas falling into black holes (accretion flows), and their use as probes of strong gravity.
Black hole discoveries 2018-2019
- The first image of a black hole showing a lensed ring of emission surrounding the dark central shadow
- Ordered rotation in high velocity atomic gas around a quasar and direct measurement of black hole mass
- Orbital motion near the event horizon of the massive black hole in the center of the Milky Way
- The gravitational redshift of a star orbiting the massive black hole in the center of the Milky Way
Videos or slides of some recent talks are online:
Imaging a black hole
Strong gravity and MHD accretion theory from resolved black hole images
Challenges for accretion theory from variable and changing look AGN (slides only)
Intense interstellar scattering is from HII regions (slides only)
Theory team in the MPE infrared group
I received a Sofja Kovalevskaja award from the Alexander von Humboldt foundation, and am now leading a theory team within the infrared group at MPE Garching! Our focus is on studying accretion physics and strong gravity around black holes, with particular interest in the Galactic center black hole candidate Sagittarius A*. This includes theoretical and data analysis work in collaboration with the Event Horizon Telescope and VLTI GRAVITY experiments, which are resolving event horizon scale emission in space and time.