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25 papers · 2 filters
Multi-frequency imaging in VLBI
S. Likhachev
The new technique, multi-frequency imaging (MFI) is developed. In VLBI, Multi-Frequency Imaging (MFI) consists of multi-frequency synthesis (MFS) and multi-frequency analysis (MFA)…
The iron -line as a tool for an evaluation of black hole parameters
A. F. Zakharov
Recent X-ray observations of microquasars and Seyfert galaxies reveal broad emission lines in their spectra, which can arise in the innermost parts of accretion disks. Simulations…
Optical and GeV-TeV flashes from gamma-ray bursts
Andrei M. Beloborodov
The synchrotron optical flash caught in GRB 990123 overlaps with the MeV radiation front, and the optical-emitting electrons must also produce GeV-TeV emission by inverse Compton s…
Hard X-ray Emission Clumps in the gamma-Cygni Supernova Remnant: an INTEGRAL-ISGRI View
A. M. Bykov, A. M. Krassilchtchikov, Yu. A. Uvarov +12
Spatially resolved images of the galactic supernova remnant G78.2+2.1 (gamma-Cygni) in hard X-ray energy bands from 25 keV to 120 keV are obtained with the IBIS-ISGRI imager aboard…
The Third VLBA Calibrator Survey
L. Petrov, Y. Y. Kovalev, E. Fomalont +1
This paper presents the third extension to the Very Large Baseline Array (VLBA) Calibrator Survey, containing 360 new sources not previously observed with very long baseline interf…
Contribution of microlensing to X-ray variability of distant QSOs
Alexander F. Zakharov, Luka C. Popovic, Predrag Jovanovic
We consider a contribution of microlensing to the X-ray variability of high-redshifted QSOs. Cosmologically distributed gravitational microlenses could be localized in galaxies (or…