The ART-XC telescope of the Russian-German orbital observatory Spektr-RG completed the first review of the entire sky, which lasted almost six months – from December 8, 2019 to June 10, 2020. All this time, the telescope continuously scanned the celestial sphere in hard X-rays, according to the website of the Space Research Institute of the Russian Academy of Sciences.
The attached figure shows all events in the energy range 4–12 keV recorded by the telescope. The uniqueness of the card lies in the fact that its angular resolution is less than one angular minute. It’s the same as replacing a large-scale map with a small-scale topographic map of the Universe. A map of comparable clarity, but in a softer range, was made 30 years ago by the German ROSAT observatory.
Next, scientists are going to investigate the resulting map and select sources of x-ray radiation on it, to find out their nature. Over the next three and a half years, seven more maps will be compiled that will add “depth” to the current one.