Search Publications
Young nuclei in dwarf elliptical galaxies
Prugniel, Ph.; Afanasiev, V. L.; Chilingarian, I. V. +1 more
We report the discovery of young embedded structures in three diffuse elliptical galaxies (dE) in the Virgo cluster: IC 783, IC 3468, and IC 3509. We performed 3D spectroscopic observations of these galaxies with the MPFS spectrograph at the 6-m Special Astrophysical Observatory telescope and obtained spatially resolved distributions of kinematic …
Ultraviolet spectrum of FU Ori and a ``Compromise'' model of the FUor
Errico, L.; Lamzin, S. A.; Kravtsova, A. S. +1 more
We have analyzed the Hubble Space Telescope spectrum of the young star FU Ori in the range 2300 3100 Å. The long-wavelength part of the spectrum is similar to the spectrum of a supergiant with T eff ≃ 5000 6000 K, but the range of wavelengths shorter than ≃2600 Å is dominated by radiation from a region with T eff ≃ 9000 K. We…
HUDF 1619—A candidate for polar-ring galaxies in the Hubble Ultra Deep Field
Dettmar, R. -J.; Reshetnikov, V. P.
A galaxy that is a good candidate for polar-ring galaxies has been detected in the Hubble Ultra Deep Field (HUDF). The galaxy HUDF 1619 (V ≈ 25 m , z ∼ 1) is the most distant object of this type known to date. A large-scale structure crosses the highly warped disk of the main galaxy seen almost edge-on at an angle of about 70°. The lumi…
High-mass X-ray binaries and the spiral structure of the host galaxy
Gilfanov, M. R.; Shtykovskiy, P. E.
We investigate the manifestation of the spiral structure in the distribution of high-mass X-ray binaries (HMXBs) over the host galaxy. We construct the simplest kinematic model. It shows that the HMXBs should be displaced relative to the spiral structure observed in such traditional star formation rate indicators as the Hα and far-infrared emissio…
Extrasolar low-orbit planets: Dissipation of their atmospheres and probable magnetic field
Ksanfomality, L. V.
Analysis of the data obtained during transits of low-orbit extrasolar planets across the stellar disk yields different estimates of their atmospheric loss rates. Experimental data point to the probable existence of several distinct subtypes of extrasolar giant planets, including "hot Jupiters" of low density (HD 209458b), with massive cores compos…
Red giants in the blue compact galaxy IZw18
Tikhonov, N. A.
Archival Hubble Space Telescope (HST) data have been used for the photometry of stars in blue compact dwarf (BCD) galaxies of the IZw18 system. Applying the spatial selection of stars, we have detected red giants, stars older than 1 2 Gyr, in the galaxies. These red giants have allowed the distance to IZw18 to be reliably determined for the first …