Researchers at the Remeis-Observatory have discovered X-rays from a star which exploded more than 130 years ago. Ernst Hartwig was a German astronomer who became the first director of the Dr Karl Remeis Observatory when it was founded in 1889. Professionally, he became known for the discovery of the... 

Researchers led by PhD student Caroline Collischon in the group of Manami Sasaki at the Remeis Observatory have introduced a new way of describing shapes in the night sky. In their recent paper on “Morphometry on the sphere” published in Communications Physics, they adapted a set of powe... 

Since 2021, the DFG research unit “eRO-STEP” (eROSITA studies of Stellar Endpoints) has been investigating astrophysical sources of X-ray emission, focusing in particular on compact objects (white dwarfs, neutron stars, and black holes) and hot gas in the interstellar medium. The SRG/eRO... 

Welcome to the Arcus simulator! This software was put together between Summer 2014 and Summer 2018 by Jörn Wilms with input from Andy Ptak, Randall Smith, Ryan Allured, Randy McEntaffer, Mark Bautz, Moritz Guenther, and many others. It is a prototype implementation of a simulation and data reconstru... 

Arcus is a high resolution X-ray grating spectrometer mission that was proposed to NASA as a MIDEX in 2016 and selected by NASA for a Phase A concept study. It will consist of high resolution (R=2500) transmission gratings mounted behind silicon pore optics as originally developed for Athena. The mi... 

The proper modeling of stellar atmospheres is the backbone of any quantitative spectroscopic analysis. Hybrid LTE/non-LTE approach To analyze spectra of early-type stars close or below the main sequence, in particular those of spectral type B, we make use of the so-called hybrid (or ADS) approach, w... 

Two major sky patrol projects were carried out by the Dr. Remeis-Observatory (Bamberg). The Northern sky was monitored from 1926 to 1939 in Bamberg, whereas monitoring the Southern Sky was carried out between 1962 and 1976 from Boyden Observatory (South Africa), Mount John (New Zeeland) and San Migu... 

K-shell transitions in astrophysically abundant metals and L-shell transitions in Fe group elements show characteristic signatures in the soft X-ray spectrum in the energy range 0.1–10 keV. These signatures have great diagnostic value for plasma parameters such as electron and ion temperatures and d... 

X-rays produced by an astronomical source are passing through the interstellar medium of our Galaxy. While the interstellar medium is almost a vacuum, it does contain some material – gas, molecules, and dust – which can absorb the X-rays. If we want to study the sources, i.e., if we want... 

The EXTraS project makes use of data obtained by XMM-Newton, an ESA science mission funded by ESA Member  States and the USA (NASA). EXTraS is funded within the EU/FP7-Cooperation Space framework and is carried out by a collaboration including INAF (Italy), IUSS (Italy), CNR/IMATI (Italy), Universit...