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  SRG X-ray orbital observatory - Its telescopes and first scientific results

Sunyaev, R., Arefiev, V., Babyshkin, V., Bogomolov, A., Borisov, K., Buntov, M., et al. (2021). SRG X-ray orbital observatory - Its telescopes and first scientific results. Astronomy and Astrophysics, 656: A132. doi:10.1051/0004-6361/202141179.

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Sunyaev, R., Author
Arefiev, V., Author
Babyshkin, V., Author
Bogomolov, A., Author
Borisov, K., Author
Buntov, M., Author
Brunner, H.1, Author           
Burenin, R., Author
Churazov, E., Author
Coutinho, D.2, Author           
Eder, J.1, Author           
Eismont, N., Author
Freyberg, M.1, Author           
Gilfanov, M., Author
Gureyev, P., Author
Hasinger, G., Author
Khabibullin, I., Author
Kolmykov, V., Author
Komovkin, S., Author
Krivonos, R., Author
Lapshov, I., AuthorLevin, V., AuthorLomakin, I., AuthorLutovinov, A., AuthorMedvedev, P., AuthorMerloni, A.1, Author           Mernik, T., AuthorMikhailov, E., AuthorMolodtsov, V., AuthorMzhelsky, P., AuthorMüller, S.1, Author           Nandra, K.1, Author           Nazarov, V., AuthorPavlinsky, M., AuthorPoghodin, A., AuthorPredehl, P.1, Author           Robrade, J., AuthorSazonov, S., AuthorScheuerle, H., AuthorShirshakov, A., AuthorTkachenko, A., AuthorVoron, V., Author more..
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              
2MPI for Extraterrestrial Physics, Max Planck Society, ou_159888              


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 Abstract: The orbital observatory Spectrum-Roentgen-Gamma (SRG), equipped with the grazing-incidence X-ray telescopes Mikhail Pavlinsky ART-XC and eROSITA, was launched by Roscosmos to the Lagrange L2 point of the Sun–Earth system on July 13, 2019. The launch was carried out from the Baikonur Cosmodrome by a Proton-M rocket with a DM-03 upper stage. The German telescope eROSITA was installed on SRG under an agreement between Roskosmos and the DLR, the German Aerospace Agency. In December 2019, SRG started to perform its main scientific task: scanning the celestial sphere to obtain X-ray maps of the entire sky in several energy ranges (from 0.2 to 8 keV with eROSITA, and from 4 to 30 keV with ART-XC). By mid-June 2021, the third six-month all-sky survey had been completed. Over a period of four years, it is planned to obtain eight independent maps of the entire sky in each of the energy ranges. The sum of these maps will provide high sensitivity and reveal more than three million quasars and over one hundred thousand massive galaxy clusters and galaxy groups. The availability of eight sky maps will enable monitoring of long-term variability (every six months) of a huge number of extragalactic and Galactic X-ray sources, including hundreds of thousands of stars with hot coronae. In addition, the rotation of the satellite around the axis directed toward the Sun with a period of four hours enables tracking the faster variability of bright X-ray sources during one day every half year. The chosen strategy of scanning the sky leads to the formation of deep survey zones near both ecliptic poles. The paper presents sky maps obtained by the telescopes on board SRG during the first survey of the entire sky and a number of results of deep observations performed during the flight to the L2 point in the frame of the performance verification program, demonstrating the capabilities of the observatory in imaging, spectroscopy, and timing of X-ray sources. It is planned that in December 2023, the observatory will for at least two years switch to observations of the most interesting sources in the sky in triaxial orientation mode and deep scanning of selected celestial fields with an area of up to 150 square degrees. These modes of operation were tested during the performance verification phase. Every day, data from the SRG observatory are dumped onto the largest antennas of the Russian Deep Space Network in Bear Lakes and near Ussuriysk.


Language(s): eng - English
 Dates: 2021-12-15
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202141179
 Degree: -



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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 656 Sequence Number: A132 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1