Physics – Optics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnts...3..110e&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, Suppl, no. 3, p. 110-116
Physics
Optics
Scientific paper
Active Galactic Nuclei (AGNs) are studied at the Crimean Observatory in the spectral range from radio to gamma rays. The research of AGNs in radio includes the observations of milliarcsecond structure of compact radio sources, extensive monitoring of them and survey of the northern sky at 3.5 cm. Results obtained in optics concern: continuum variability to reveal the nature of AGNs central sources; connection between the flux variability of broad emission lines and continuum; the nature of the broad line region, its dimension and structure. Optical results are based on data of long time-scale spectral monitoring of AGNs and permit to investigate the evolution of the broad emission line profiles and other spectral characteristics. Data on UBVRI flux variability of the nuclei of Seyfert galaxies obtained through 7 years permit to suspect that different sources caused variability occurred on intranight and extranight time scales. Photopolarimetric observations of dozen of BL Lac type objects, which have been carried out since the 70s, have revealed the large variations of the polarization degree up to 40% and the position angle of polarization in long (months) and short (days) time scales. These variations confirm the shock wave model of blazar's jets and indicate the long-lived spiral structure of the magnetic field in the inner part of jet. The short-terms variations of the brightness and polarization parameters can be explained by the irregular structure of flux of relativistic electrons penetrating along the jet. Differences in stellar content of circumnucleus of AGNs and normal galaxies and flux variability of several AGNs were obtained using 1600--3500 Å spectral observations with the scanning spectrometer of Space Station ``Astron". The observations of very high energy gamma radiation from AGNs were carried out at the Crimean Astrophysical Observatory with the aid of ground-based detector. The gamma-ray flux was detected from blazars Mkn 501 in observations in 1997--98 and 3C 66A in observations 1996--1997. The observations of BL Lac carried out in 1998 also show the γ-rays radiation from this object.
Efimov Yu S.
Merkulova Nelly I.
Neshpor Yu I.
Pronik I. I.
Pronik Vladimir I.
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