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Kinematic control of the inertiality of the system of Tycho-2 and UCAC2 stellar proper motions
Bobylev, V. V.; Khovirtchev, M. Yu.
Based on the Ogorodnikov-Milne model, we analyze the proper motions of Tycho-2 and UCAC2 stars. We have established that the model component that describes the rotation of all stars under consideration around the Galactic y axis differs significantly from zero at various magnitudes. We interpret this rotation found using the most distant stars as …
Constraints on the late X-ray radiation from the low-energy gamma-ray burst of December 3, 2003: INTEGRAL data
Sunyaev, R. A.; Sazonov, S. Yu.; Lutovinov, A. A. +1 more
Comparison of the INTEGRAL upper limits on the hard X-ray flux before and after the low-energy GRB 031203 with the XMM measurements of the dust-scattered radiation at lower energies suggests that a significant fraction of the total burst energy could be released in the form of soft X-ray radiation at an early afterglow stage with a characteristic …
Stellar population of the central regions of NGC 5128
Tikhonov, N. A.; Galazutdinova, O. A.; Hagen-Thorn, V. A. +1 more
We present the results of stellar photometry in eight fields of NGC 5128 (Cen A), a candidate polar-ring galaxy, obtained by reducing images from the Hubble Space Telescope archive. In all cases, the color-magnitude diagrams reached the red-giant region, and the distance to the galaxy was determined from the position of the tip of the red-giant br…