Here you would find a brief summary of the most important results of
scientific research carried out by our researchers during the last year,
presented by the observatory to the Department of Physical Sciences
of the RAS.
Access here the archives of our results from 1993.
Detection of the 4th harmonica in the cyclotron radiation above the spot
Radiation of the 4th harmonica of the gyro-frequency in the Solar corona above the spot was detected due to detailed spectroscopic observations at RATAN-600 with high accuracy polarization measurements. Radio astronomical measurements of cyclotron radiation are based on the fact that radiation generated in a magnetic field is circularly polarized, and the sign and degree of polarization depend on the type of radiation mechanism, temperature, and density of plasma, in the place where the radiation emerged and propagated. In the case of the defined emission mechanism, polarization measurements of radio emission provide an opportunity to determine the magnetic field strength. Significance of the result obtained is defined by the importance of measurements of coronal magnetic fields in those areas of the solar atmosphere, where traditional optical methods based on the Zeeman and Hanle effects are inefficient because of high coronal temperatures.
Authors: Kaltman T.I., Bogod V.M., Storozhenko A.A.
The result was presented at the "Solar and Solar-Terrestrial Physics 2017" XXI Russian Annual Conference on Solar Physics (October 0, 2017 - October 13, 2017), Pulkovo Observatory
Archive of achievements, Solar system sector
Detection of rapid attenuation of magnetic characteristics of chemically
peculiar stars in the Orion OB1 association with age
Resulting from observations of the young star association Orion OB1 carried out with the 6-m BTA telescope of SAO RAS, it was obtained that incidence of chemically peculiar stars relative to normal, incidence of magnetic stars relative to peculiar, and average magnetic field decrease two times with the average age increasing from 3 to 10 Myr. The relation given is obtained for the first time ever and can serve a new observation test to numerically check the concept on formation and evolution of magnetic CP stars.
Authors: Romanyuk I.I., Semenko E.A., Kudryavtsev D.O., Yakunin I.A., Moiseeva A.V.
1. Romanyuk I.I., Semenko E.A., Yakunin I.A., Kudryavtsev D.O., Moiseeva A.V., 2017, Astrophysical Bulletin, Vol.71, 183
2. Romanyuk I.I., Semenko E.A., Yakunin I.A., Kudryavtsev D.O., 2017, ASPC, v.510, 214
3. Romanyuk I.I., Semenko E.A., Yakunin I.A., Kudryavtsev D.O., Moiseeva A.V., 2017, Astronomische Nachrihten, 2017, submitted
Detection of fast variations of visual radiation of the binary millisecond pulsar J1023+0038
In February of 2017, photopolarimetric observations of the close binary system with the millisecond pulsar J1023+0038 (several years ago it developed from the ejection state into the accretion) were carried out with the 6-m BTA telescope of SAO RAS. Its numerous stochastic variations of brightness in the B, V, and U bands with the amplitude of 0.2m - 0.5m on the time scale of 10-100 s have been obtained during 3.5 hours. Outbursts up to 0.3 s with 0.1-s leading edges have been detected for the first time ever. The obtained results show that the system is at the "propeller" stage
Authors: Beskin G.M., Karpov S.V., Plokhotnichenko V.L., Sokolov V.V. in collaboration with Shibanov Yu.A., Zyuzin D.A. (Ioffe Institute), Kholtygin A. F., Baryishev Yu.V., (Saint Petersburg State University)
1. Shibanov Yu.A., Beskin G.M., Karpov S.V., Plokhotnichenko V.L., Zyuzin D.A., Kholtygin A.F., Sokolov V.V., Baryishev Yu.V., International Conference "Physics of Neutron Stars -2017", The Open Access Journal of Physics: Conference Series (JPCS)
2. Beskin G.M., Karpov S.V., Plokhotnichenko V.L., Shibanov Yu.A., Zyuzin D.A., Kholtygin A.F., Sokolov V.V., Baryshev Yu.V., The International Conference SN 1987A, Quark Phase Transition in Compact Objects and Multimessenger Astronomy, 2-8 July 2017
Observed confirmation of the presence of the third component in the CI Cam system
The orbital solution of the radial velocity curve of wind-lines for the CI Cam as a triple system suggests a possible presence of the third massive component. It is just the close passage of the third component in 2009 which is associated with the system's transition to an active stage; this stage manifested itself in the brightness increase in all photometric bands, growth of the He II 4686A emission, extreme change of radial velocity curve of the white dwarf, and in the change of double-mode pulsations for single-mode.
Authors: Barsukova E.A., Valeev A.F., Burenkov A.N., Klochkova V.G., Panchuk V.E., Yushkin M.V. (SAO RAS); Goranskij V.P., Metlova N.V. (SAI MSU); Bjorkman K.S., Manset N., Miroshnichenko A.S. (USA), Zharikov S.V. (Mexico).
Goranskij V.P., Barsukova E.A., Bjorkman K.S., Burenkov A.N., Klochkova V.G., Manset N., Metlova N.V., Miroshnichenko A.S., Panchuk V.E., Yushkin M.V., and Zharikov S.V., ASP Conference Series V508, 307-312, 2017, "B[e] Star CI Cam: Eighteen Years of Research"
Archive of achievements, Galaxy sector
Inclinations and structure of central regions of active galaxies from observations in polarized light
From the analysis of changes of polarization plane in broad emission line profiles of hydrogen, black hole masses were estimated for the sample of 29 Sy1 galaxies using the method independent of the inclination angle of a galaxy to the line of sight. We have derived inclination angles of broad-line regions (BLR) of disks to the line of sight with the use of the literature data on BLRs and line widths measured with the 6-m BTA telescope as well as mass estimates from polarization. Inclination angles determined in such a way are in the range of 20-40o and correlate well (r~0.86) with inclination angles of galactic disks. Within a simple model of equatorial scatter of BLR emission in a gas and dust torus, it is shown that BLR disks in the galaxies of our sample are similar, and the brightness distribution for them can be described with the power-law dependence on the radius with a power exponent of -0.57.
Afanasiev V.L. and Shapovalova A.I. (SAO RAS) in collaboration with Popovic L.C. (Belgrade Astronomical Observatory, Serbia).
1. Afanasiev V.L., Popovic L.C., Shapovalova A.I. Spectropolarimetrical observations of 29 Type 1 AGNs with SAO 6-meter telescope: I. Black hole mass and BLR inclination measurements, 2017, MNRAS (submitted)
2. Afanasiev V.L., Popovic L.C., Polarization in lines - a new method for measuring black hole masses in active galaxies , 2015, ApJ L, V 800, L35
Discovery of a dwarf companion of a dwarf galaxy
A galaxy of extremely low luminosity was discovered in images obtained with the ACS camera of the Hubble Space Telescope nearby the dwarf galaxy LV J1157+5638. Such a remote faint galaxy has been discovered for the first time ever. In the galaxies of interest, individual stars are clearly observed including red giant branch stars. This galaxy pair is located at a distance of about 30 million light-years from Earth. According to our studies, the dwarf galaxies make a physical pair.
Makarova L.N., Makarov D.I., Antipova A.V., Karachentsev I.D. (SAO RAS) in collaboration with Tully R.B. (Hawaii's Institute for Astronomy, USA)
Makarova L.N., Makarov D.I., Antipova A.V., Karachentsev I.D., Tully R.B., Serendipitous discovery of a faint dwarf galaxy near a Local Volume dwarf, 2017, MNRAS, doi:10.1093/mnras/stx2867
Detection of overdensity excess of field galaxies near a redshift of
z≈0.56 around the gamma-ray burst GRB 021004 position
Characteristic features of clusterization of field galaxies toward the gamma-ray burst GRB 021004 were detected: 1) distribution of photometric redshifts in the BTA field (of a size of ~ 4'x4') GRB 021004 with a peak at about z~0.56, determined from the multi-color BVRI photometry toward this gamma-ray burst + HST/ACS data; 2) the absorption doublet Mg II 2796/2803Å at a redshift of z≈0.56 found in the VLT/UVES spectrum of the gamma-ray burst afterglow; 3) clusterization of galaxies in the greater region (~ 3x3 square degrees) around the GRB 021004 with the effective peak at about z~0.56 found from the spectral and photometric z distributions using new catalogs. According to the data from six catalogs, the sizes of the whole inhomogeneity were estimated ~7±1 in the distribution of galaxy clusters with the peak at about z≈0.56.
Zhelenkova, O.P., Verkhodanov, O.V., Sokolov, V.V. in collaboration with Sokolov, I.V. (Institute of Astronomy of the Russian Academy of Sciences), Castro-Tirado A.J. (IAA, Spain), Sokolov, I.A. (Saint Petersburg State University), Baryshev Yu.V. (Saint Petersburg State University).
1. Sokolov, Ilya V.; Castro-Tirado, A.J.; Verkhodanov, O.V.; Zhelenkova, O.P.; Baryshev, Yu.V., "Clustering of galaxies around the GRB 021004 sight-line at z ~ 0.5" in "Proceedings of the International Workshop on Quark Phase Transition in Compact Objects and Multimessenger Astronomy: Neutrino Signals, Supernovae and Gamma-Ray Bursts", Russia, Nizhnij Arkhyz (SAO RAS), Terskol (BNO INR RAS), October, 7 - 14, 2015, pp. 111, Publishing house "Sneg", Pyatigorsk, 2016. (http://adsabs.harvard.edu/abs/2016qptc.conf.111S)
2. Yu.V.Baryshev, I.V.Sokolov, A.S.Moskvitin et al., "Study of Faint Galaxies in the Field of GRB 021004", Astrophysical Bulletin, 65, 311 (2010), (http://arxiv.org/abs/1010.3910)
3. Sokolov Ilya V., Zhelenkova Olga P., Solovyev Ilya A., Castro-Tirado Alberto J., and Verkhodanov Oleg V., "The field galaxies clustering in GRB 021004 line of sight and in the larger areas with an effective peak near z ~ 0.56" Astrophysical Bulletin (submitted)
Archive of achievements, Metagalaxy sector
Hardware and methodological developments
Photometer with the tunable filter for medium-sized telescopes
The Mapper of Narrow Galaxy Lines (MaNGaL) has been developed and manufactured. The instrument, the principle of operation of which is based on the use of the Fabry-Perot interferometer, allows us to obtain monochromatic images of galactic and extragalactic objects in different emission lines of ionized gas. It was successfully tested at the 1-m SAO RAS telescope and 2.5-m telescope of the Caucasian Mountain Observatory of SAI MSU.
Authors: Moiseev A.V., Perepelitsyn A.E.
The result is presented at the VAK-2017 Russian conference: Perepelitsyn A.E., Moiseev A.V., "Optical reducer with the tunable interference filter for small- and medium-sized telescopes"
New radiometric complex at RATAN-600 to observe fast radio bursts
A new radiometric complex for the range of 4.7 GHz has been developed and implemented at the RATAN-600 telescope of SAO RAS. The complex is designed for observations of fast radio bursts in the mode of the twenty-four-hour automatic sky survey. The standard radio survey of objects falling within the field of view is conducted simultaneously. The radiometric complex includes: 4 radiometers with the 600-MHz common band and division of the common band into 4 "narrow" contiguous subbands of 150 MHz each. The construction given allows one to reliably detect fast bursts from the outer space and separate them from local radio noise basing on radio wave dispersion in the interstellar medium.
Authors: Nizhelskij N.A., Tsybulev P.G., Kratov D.V., Udovitskij R.Y., Borisov A.N., Fabrika S.N., Trushkin S.A., Fabrika S.N.
The result is presented at the VAK-2017 Russian conference: Tsybulev P.G., Nizhelskij N.A., Dugin M.V., Borisov A.N., Kratov D.V., Udovitskij R.Y., "New uncooled radiometric module of the 4.7 GHz to observe in the continuum".
Archive of achievements, Instrumental and Methodological Development sector
Archive of achievements, Astronomical education sector