KINEMATICS DERIVED FROM NORTHERN AND SOUTHERN HEMISPHERES OF HUGE ASTROMETRIC CATALOGUES

V. Vityazev, A. Tsvetkov

Research output

Abstract

It is shown that the kinematic analysis of the UCAC4, PPMXL and XPM proper motions in northern and southern Galactic hemispheres detects retardation of the Galaxy’s rotational velocity and acceleration of the expansion velocity of the stellar system with increasing the distance from the principal Galactic plane. The estimates of the vertical gradient of the Galactic rotation are UCAC4: 40:1 § 0:2; PPMXL: 36:2 § 0:4; XPM: 37:7 § 0:1 km ¢ s¡1 ¢ kpc¡1, while the values of the vertical gradient of the expansion velocity turned out to be UCAC4: 11:9 § 0:2; PPMXL: 19:0 § 1:1; XPM: 10:9 § 0:3 km ¢ s¡1 ¢ kpc¡1.
Original languageEnglish
Title of host publicationProceedings of the Journees 2014 "Systemes de reference spatio-temporels", Z. Malkin and N. Capitaine (eds)
Pages44-45
Publication statusPublished - 2015

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Vityazev, V., & Tsvetkov, A. (2015). KINEMATICS DERIVED FROM NORTHERN AND SOUTHERN HEMISPHERES OF HUGE ASTROMETRIC CATALOGUES. In Proceedings of the Journees 2014 "Systemes de reference spatio-temporels", Z. Malkin and N. Capitaine (eds) (pp. 44-45)