Welcome to my personal homepage

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I am a Post Doc at the Anton Pannekoek Institute for Astronomy at the University of Amsterdam. On this homepage, I also provide information on activities at the Dr. Remeis Observatory (Univ. Erlangen-Nürnberg), where I finished my PhD in 2017.

What is my research about?

The bottom part of this page is rather technical. Here I give a summary for the broader audience. I study the multi-wavelength appearance of compact objects (black holes or neutron stars) that "accrete" matter from their surroundings. In these systems, matter slowly spirals towards the central black hole. This "fuel supply" accounts for the release of immense amounts of radiated energy (these engines are about 14-times more efficient than nuclear fusion!). In the process of accretion, often strong outflows of matter are launched perpendicular to the accreting plane up to distances that allow us to observe these streams. In the most extreme cases, the outflows are collimated and move at nearly the speed of light. So-called jets are formed - a regime of extreme physics that hits the limits of our understanding. Our group around Prof. Sera Markoff at API is pursuing to expand our knowledge of jets by combining cutting-edge research in both theoretical modeling and observations. I am in particular interested in the impact of these radiative / mechanical feedback channels onto the larger-scale galactic/intergalactic environment. Also, it is subject of my research to understand better the composition/geometry of the close environment of accreting black holes - a region that is too compact to be imaged even with modern telescopes.

My personal five cents:

As researchers, we have the responsibility to sustain high-quality research. This requires also to have a close and critical dialog with the broad community including the research community across all fields. Please see this page for my activities to support science communication.

Interested to learn more about...

...my research? See ADS for my publication list.
...me? Download my CV.

  • Single Dish Radio Polarimetry

    Together with the MPIfR, Bonn, I am studying the calibration of polarimetric data taken with the Effelsberg 100-m Radio Telescope in the framework of the F-GAMMA program. The large-scale polarization of 3C 111 is a key topic.

  • VLBI Polarimetry

    Using MOJAVE data, I am also interested in the polarization signatures of 3C 111 (Beuchert et al., 2017b) at milliarcsecond resolution, which enable a detailed study of parsec-scale jet physics.

  • X-ray studies of Seyfert Galaxies

    I am interested in the innermost absorbing structures of Seyfert galaxies, which me and my collaborators have been studying using time-resolved X-ray spectroscopy for example in NGC 3227 (Beuchert et al., 2015). Besides using data of all available X-ray observatories, this study emphasizes the importance of deep investigations of available multi-wavelength information. Also, I have been using the relxill model family to describe relativistic reflection in presence of strong gravity in a self-consistent lamp-post geometry, for example in NGC 4151 (Beuchert et al., 2017a).

  • Blazars and X-ray binaries in the hard X-rays

    INTEGRAL comprises full data coverage of the whole sky in the hard X-rays since the year 2000. I have been extracting and interpreting data of the instruments IBIS, JEM-X, and SPI for blazars of the TANAMI sample and selected X-ray binaries.

  • Accretion and Feedback

    Accretion and feedback are linked processes in accreting compact objects from stellar to galactic masses. For the last decades, researchers have been studying the evolution of these objects on different timescales. In Beuchert et al. 2018, we study the feedback of the young radio galaxy PKS~1718-649 with a focus on its extended X-ray-emitting gas.
    We are currently investigating host galaxy properties of several active galaxies to explain differing jet morphologies with (G)RMHD model H-AMR developed at API.
    In an ongoing project, me and my collaborators investigate stellar-mass accreting black holes / neutron stars at their extremes. Ultra Luminous X-ray sources seem to accrete at the highest rates and also show extremely powerful feedback. We use currently developed physical models to describe the electromagnetic spectrum of ULXs. We will tighten our constraints by consulting the response of the environment to the released energy modeled before.

Tobias Beuchert