The “Spektr-RG” orbital observatory marks an important stage – one third of the X-ray map of the entire sky is built. The number of registered X-ray sources in the Russian half of this map (16.7% of the entire sky) exceeds 95,000. Only one sixth of them were detected by the German satellite ROSAT on the world’s only complete X-ray map of the sky, obtained back in 1990.
The registered number of sources corresponds to the predictions of scientists.
The figure shows that the longest exposure and density of sources (per square degree) are accumulated in the region of the ecliptic poles (the north pole is shown in the figure), where all sky scans intersect.
The appearance of a dark strip in the image of the X-ray sky is associated with the absorption of soft X-rays by gas and dust in the plane of our Galaxy.
The inset on the left shows the “rich” cluster of galaxies A 426, on the right – the brightest remnant of a supernova flare (Cas A) in the constellation Cassiopeia. Recall: each of these images was obtained in a 5-minute exposure.
Scanning of the sky by telescopes of the Spectrum RG orbital observatory continues. Roscosmos enterprises control the satellite, long-distance space communication antennas receive scientific data every day and send commands to scientific instruments. Scientists at the IKI RAS are in the process of processing scientific data. A similar map on the opposite side of the sky is built by scientists from the German Institute for Extraterrestrial Physics of the Max Planck Society (Max Planck Institut fuer Extraterrestrische Physik, MPE).
Source: “Обсерватория «Спектр-РГ» отсканировала треть всего неба” Science information portal “Poisk”, 05 March 2020. <https://www.poisknews.ru/themes/space-themes/spektr-rg-est-rentgenovskaya-karta-treti-vsego-neba/>