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  1. No Access

    Article

    What Can We Learn about Compton-Thin AGN Tori from Their X-ray Spectra? *

    We have developed a Monte Carlo code for simulation of X-ray spectra of active galactic nuclei (AGN) based on a model of a clumpy obscuring torus. Using this code, we investigate the diagnostic power of X-ray ...

    F. Melazzini, S. Sazonov in Astronomy Letters (2023)

  2. No Access

    Article

    Detection of large-scale X-ray bubbles in the Milky Way halo

    The halo of the Milky Way provides a laboratory to study the properties of the shocked hot gas that is predicted by models of galaxy formation. There is observational evidence of energy injection into the halo...

    P. Predehl, R. A. Sunyaev, W. Becker, H. Brunner, R. Burenin, A. Bykov… in Nature (2020)

  3. No Access

    Article

    On-ground calibration of the ART-XC/SRG mirror system and detector unit at IKI. Part III

    We have performed tests of the SRG project’s ART-XC telescope’s flight spare units of the mirror system (MS) and the URD focal plane X-ray detector. During the tests, the MS was illuminated by a quasi-parallel...

    M. Pavlinsky, A. Tkachenko, V. Levin, A. Krivchenko, A. Rotin… in Experimental Astronomy (2019)

  4. No Access

    Article

    On-ground calibration of the ART-XC/SRG mirror system and detector unit at IKI. Part II

    We have performed calibration tests of a spare CdTe detector unit of the ART-XC/SRG telescope at the Space Research Institute’s 60-m-long X-ray test facility. During the tests, we illuminated the detector with...

    M. Pavlinsky, A. Tkachenko, V. Levin, A. Krivchenko, A. Rotin… in Experimental Astronomy (2019)

  5. No Access

    Article

    On-ground calibration of the ART-XC/SRG mirror system and detector unit at IKI. Part I

    From October 2016 to September 2017, we performed tests of the ART-XC /SRG spare mirror system and detector unit at the 60-m-long IKI X-ray test facility. We describe some technical features of this test facil...

    M. Pavlinsky, A. Tkachenko, V. Levin, A. Krivchenko, A. Rotin… in Experimental Astronomy (2018)

  6. No Access

    Article

    Calibration of the ART-XC mirror modules at MSFC

    The Astronomical Röntgen Telescope X-ray Concentrator (ART-XC) is a hard X-ray telescope with energy response up to 30 keV, to be launched on board the Spectrum Röntgen Gamma (SRG) spacecraft in 2018. ART-XC c...

    R. Krivonos, A. Tkachenko, R. Burenin, E. Filippova, I. Lapshov… in Experimental Astronomy (2017)

  7. No Access

    Article

    Cobalt-56 γ-ray emission lines from the type Ia supernova 2014J

    The detection of 56Co γ-ray emission from the supernova 2014J proves that type Ia supernovae result from a thermonuclear explosion of a carbon–oxygen white dwarf or of a pair of merging white dwarfs.

    E. Churazov, R. Sunyaev, J. Isern, J. Knödlseder, P. Jean, F. Lebrun, N. Chugai… in Nature (2014)

  8. No Access

    Article

    Discrete sources as the origin of the Galactic X-ray ridge emission

    An apparently diffuse Galactic ridge of X-ray emission, which appears from Earth to be virtually coincident with the Milky Way disk, has puzzled X-ray astronomers since it was first observed about 25 years ago...

    M. Revnivtsev, S. Sazonov, E. Churazov, W. Forman, A. Vikhlinin, R. Sunyaev in Nature (2009)

  9. No Access

    Chapter and Conference Paper

    Statistics of Local Hard X-Ray Selected AGN: Contribution of Obscured Accretion Onto Supermassive Black Holes

    S. Sazonov, M. Revnivtsev, R. Krivonos… in Relativistic Astrophysics Legacy and Cosmo… (2007)

  10. No Access

    Chapter and Conference Paper

    Supermassive Black Holes in Elliptical Galaxies: Switching from Very Bright to Very Dim

    Relativistic outflows (mainly observed in the radio) are a characteristic feature of both Galactic stellar mass black holes and supermassive black holes (SMBHs). Simultaneous radio and X-ray observations of Ga...

    E. Churazov, S. Sazonov, R. Sunyaev… in Relativistic Astrophysics Legacy and Cosmo… (2007)

  11. No Access

    Chapter

    Annihilation of positrons in the Galaxy

    Observations of electron-positron annihilation radiation from the Galactic Center region with the SPI instrument aboard INTEGRAL are summarized. The measured width of the 511 keV line and inferred fraction of ...

    S. Sazonov, E. Churazov, R. Sunyaev… in Focusing Telescopes in Nuclear Astrophysics (2006)

  12. No Access

    Article

    Annihilation of positrons in the Galaxy

    Observations of electron-positron annihilation radiation from the Galactic Center region with the SPI instrument aboard INTEGRAL are summarized. The measured width of the 511 keV line and inferred fraction of ...

    S. Sazonov, E. Churazov, R. Sunyaev, M. Revnivtsev in Experimental Astronomy (2005)

  13. No Access

    Chapter

    Hard X-Ray and Gamma Ray Spectroscopy

    R. Sunyaev, S. Sazonov in High-Energy Spectroscopic Astrophysics (2005)

  14. No Access

    Article

    Review of GRANAT observations of gamma-ray bursts

    The GRANAT observatory was launched into a high apogee orbit on 1 December, 1989. Three instruments onboard GRANAT - PHEBUS, WATCH and SIGMA are able to detect gamma-ray bursts in a very broad energy range fro...

    O. Terekhov, D. Denissenko, R. Sunyaev, S. Sazonov… in Astrophysics and Space Science (1995)