About ASC
ASC Projects:
Suffa (Uzbekistan)

ASC Divisions:
Moscow Branch
PRAO (Pushchino)
Department of Quantum Astrophysics
1. General information
Head of Department – Prof., Kurt, Vladimir G., .
Burgin, Michael S., Head of Laboratory, PhD
Fadeev, Eugeny N., Jun. Research Scientist
Finkel, Matvey I., Research Scientist, PhD
Goltsman, Gregory N., Prof., Head of Laboratory
Kreycman, Boris B., Research Scientist, PhD
Malakhova, Lyudmila A., Engineer
Mironova, Elene N., Research Scientist, PhD
Shakhvorostova, Nadezhda N., Jun. Research Scientist, PhD
Ugolnikov, Oleg S., Research Scientist, PhD (part-time)
Research Activities
  • The “Millimetron” project: Design of scientific instrumentation for the space 12 m diameter telescope (cryogenic as a whole) intended for astronomical observations in the millimeter and sub-millimeter wavelengths (sensitive flux density measurements and radio interferometry Space-Earth and Space-Space with a super high angular resolution) [N.S. Kardashev, V.G. Kurt, E.N. Mironova, L.A. Malakhova, A.E. Stefanovich].
  • Project "Radioastron: development of processing and visualization performance telemetry data. (Burgin, E. Mironova, EN Fadeev).
  • Holding and processing of optical observations of pulsar radiation and the optical transient cosmic gamma-ray bursts with the BTA SAO (V.G. Kurt).
  • The spectral distortion of cosmic microwave background in the recombination of matter in the early universe (Burgin, N. Shakhvorostova).
  • Analysis of the orbits of satellites intended for astronomical observations. (BB Kreytsman).
  • 2. Spectral distortions of the Cosmic Microwave Background
    due to the recombination in the early Universe.
    Brief Iintroduction
    One of the major tools to investigate a Universe thermal history is a study of the spectral distortions of the CMB. These distortions originate from the interaction of the CMB photons with the matter at different evolution stages of the Universe. A comparison of observations with theory of the spectral distortions formation allows to extract the information about process parameters, which characterize the state of the matter at different stages of the Universe evolution.

    As the Universe expanded, the temperature of both matter and radiation decrease, and approximately after 100 thousands years after the expansion a process of plasma recombination began. At the end of the epoch of recombination, at z~1000, a temperature of the matter and radiation decrease down to T~2000-3000 K, and the radiation decouples from the matter. Epoch of the decoupling of the radiation from the matter is called the epoch of a last-scattering (or the epoch of a transparency). From this moment, the radiation freely propagates as the matter is transparent for radiation. The red-shifted photons arrive to the observer with z=0. These photons are observed now as the Cosmic Microwave Background (“relic” radiation).

    The photons originating from the plasma recombination partly remain until the current epoch, and thus make an “excess” to the equilibrium CMB, i.e., distort it. The spectrum of such photons is called “the cosmological hydrogen recombination spectrum”. Measurements of the wavelengths, intensities and profiles of the recombination lines allow to get information on the plasma temperature, baryon density of Universe and red-shift corresponding to the epoch of recombination and on the duration of this epoch. The detection of the recombination distortions of CMB will be an another evidence of the epoch of recombination existence. On the other hand, this detection will be an independent method to estimate baryon density of the Universe, since the cosmological hydrogen recombination spectrum directly depends on this value.
    Our publications about this study:
    1.Burgin, MS "Radiation in the subordinate lines of hydrogen in the era of cosmological recombination" / / Astronomical Journal, v. 80, p. 771 (2003).
    2. Dubrovich V.K. & Shakhvorostova, N.N., “Hydrogen absorption lines in the cosmic microwave background spectrum”, Astronomy Letters 30, pp. 509-513, 2004.
    3. Burgin, M.S, Kauts, V.L. & Shakhvorostova, N.N., “On the effect of collisional transitions on the cosmological hydrogen recombination spectrum”, Astronomy Letters 32, pp. 507-513, 2006.
    4.Shakhvorostova NN "Kinetics of cosmological hydrogen recombination" Proc 35 th International Student Scientific Conference "Physics of the Cosmos", Ekaterinburg, p. 280 (2006).
    5. Burgin, MS "The method is equivalent to a two-level atom for the calculation of the kinetics of cosmological hydrogen recombination" / / Brief Communications in Physics, t. 36, N 4, p. 26 (2009).
    6. Burgin, MS "The method of reduced multi-level atom for the calculation of the kinetics of the cosmological recombination" / / Brief Communications in Physics, 37, N 9, 30 (2010).
    Besides these publications, PhD Thesis by N.N Shakhvorostova “The distortions of CMB spectrum due to the cosmological hydrogen recombination” has been approved.
    Analysis of the orbits of satellites intended for astronomical observations
    Main area of work - searching for a strongly evolving orbits for MCT projects Radioastron and Millimetron which satisfy all the technological limitations and allow us to solve scientific problems of projects. A preliminary search is conducted within a limited three-body problem, for which to develop adequate algorithms and software.
    Our publications about this study:
    1. Kreysman BB "The families of periodic solutions of Hamiltonian systems. Asymmetric periodic solutions of planar restricted problem of three bodies. " Cosmic. Research, 2005, Volume 43, № 2. P.88-110.
    2. Kreysman BB "Periodic solutions of the spatial restricted three-body problem." Cosmic. Issled., 2009, Vol 47, № 1. P.64-78.
    3. Kreysman BB "Periodic solutions of the spatial restricted three-body problem and apply them to project Millimetron". Preprint. Physical Sciences. them. AP Academy of Sciences, 2009, № 27, 32s.