Research Highlights
Here we show recent research results from the Radio Astronomy/Very-Long-Baseline Interferometry department.
A novel multiscale imaging approach for radio interferometry: DoG-HiT
19 October 2022
A new algorithm for imaging interferometric data has been developed by MPIfR astronomers Hendrik Müller and Andrei P. Lobanov, based on a multiscale wavelet deconvolution algorithm, DoG-HiT, for imaging sparsely sampled interferometric data. The method combines the difference of Gaussian (DoG) wavelets and hard image thresholding (HiT). DoG-HiT is a stable method and benchmark its performance against image reconstructions made with the CLEAN and regularized maximum-likelihood (RML) methods using synthetic data. The comparison shows that DoG-HiT matches the super-resolution achieved by the RML reconstructions and surpasses the sensitivity to extended emission reached by CLEAN. Further details of this algorithm can be found the publication presented in the latest issue of Astronomy & Astrophysics, available here.
A comprehensive summary of the VLBI analysis software, presented to the community
10 October 2022
Very-long-baseline interferometry (VLBI) is a challenging observational technique, which requires in-depth knowledge about radio telescope instrumentation, interferometry, and the handling of noisy data. The reduction in raw data is mostly left to the scientists and demands the use of complex algorithms implemented in comprehensive software packages. The correct application of these algorithms necessitates a good understanding of the underlying techniques and physics that are at play. The verification of the processed data produced by the algorithms demands a thorough understanding of the underlying interferometric VLBI measurements. A review led by MPIfR scientist Michael Janßen, also contributed by Jan Wagner from our institute describes the latest techniques and algorithms that scientists should know about when analyzing VLBI data. This work is published in the present issue of the scientific journal Galaxies, see here.
EHT Image of the Black Hole in SgrA* - MPIfR scientists tell the story
This time we have insight information, emotional thoughts, and exciting scientific news collected by the Event Horizon Telescope (EHT) Collaboration members at the Max Planck Institute for Radio Astronomy in Bonn, Germany. It has been a great, devoting journey since Sagittarius A* was observed by the EHT in 2017. Our colleagues tell their side of the story.
Created by Joana A. Kramer & Luca Ricci, MPI für Radiastronomie
Astronomers reveal first image of the black hole at the heart of our galaxy - Event Horizon Telescope Official Press Release
Astronomers reveal first image of the black hole at the heart of our galaxy - European Southern Observatory Official Press Release
Today, at simultaneous press conferences around the world, including at the European Southern Observatory (ESO) headquarters in Germany, astronomers have unveiled the first image of the supermassive black hole at the centre of our own Milky Way galaxy. This result provides overwhelming evidence that the object is indeed a black hole and yields valuable clues about the workings of such giants, which are thought to reside at the centre of most galaxies. The image was produced by a global research team called the Event Horizon Telescope (EHT) Collaboration, using observations from a worldwide network of radio telescopes.
Press Conference at ESO on new Milky Way results from the EHT team, followed by a public Q&A event
The ESO Director General delivered the opening words. EHT Project Director Huib Jan van Langevelde and EHT Collaboration Board Founding Chair Anton Zensus delivered remarks. A panel of EHT researchers including Thomas P. Krichbaum (MPIfR) and Christian Fromm (Univ. Würzburg, also affiliated with the MPIfR) explained the result and answer questions from journalists.
Following the press conference, at 16:30 CEST ESO hosted an online event for the public via this same streaming link: a live question and answer session where members of the public will have the opportunity to query another panel of EHT experts (which include also Michael Janssen from the MPIfR).
Selected press coverage
For the German-speaking reporting, go to our area in German language.