Kinematics of Galactic Disc

1997/03/17 by J. Klačka, Jozef Klacka, Klacka, Jozef
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Stellar, planetary, and galactic studies #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/9703102

5 pages, LaTeX, no figures

arxiv created 1997/03/17 · openalex publication_date 1997/03/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The method of constructing of rotation curve for our galactic disc is discussed. Simple physical model shows that the velocity of the Sun around the center of the Galaxy must be less than currently accepted IAU value 220 km/s. Independently obtained result for neutral hydrogen (λ= 21.1 cm) confirms the previous statement. The values of the Sun's velocity is about 110 km/s. As a consequence, the rotation curve for the disc of our Galaxy is not flat, but it is a decreasing function of the distance from the center of the Galaxy. This conclusion seems to be consistent also with other galaxies.

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