What is eROSITA?

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What is eROSITA? Blog Image


Recently, the German eROSITA consortium has released the data for its share of the first all-sky survey by the soft X-ray imaging telescope.


  • · The eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is a wide-field X-ray telescope on-board the Russian-German "Spectrum-Roentgen-Gamma" (SRG) observatory.
  • · It was developed under the leadership of the Max-Planck Institute for extraterrestrial Physics in Germany (DE).
  • · It is a sensitive X-ray telescope capable of delivering deep, sharp images over very large areas of the sky.
  • · The eROSITA telescope consists of seven identical Wolter-1 mirror modules.
  • · SRG was successfully launched from Baikonur on July 13 2019, and placed in a halo orbit around the L2 point.
  • · Functions
    • o It has been performing an all-sky survey, in which the whole celestial sphere is mapped once every six months. Eight such all-sky charts are planned until December 2023.
    • o It is also expected to yield a sample of several million Active Galactic Nuclei, providing a unique view of the evolution of supermassive black holes within the emerging cosmic structure.
    • o The survey will also provide new insights into a wide range of astrophysical phenomena, including accreting binaries, active stars and diffuse emission within the Galaxy, as well as solar system bodies that emit X-rays via the charge exchange process. 

Q1) What is a black hole?

A black hole is an area of such immense gravity that nothing—not even light—can escape from it. Black holes form at the end of some stars' lives.

Source: First, eROSITA sky-survey data release makes public the largest-ever catalogue of high-energy cosmic sources