Dark matter and rotation curves of spiral galaxies

0461451 - MÚ 2017 RIV BG eng J - Článek v odborném periodiku
Křížek, Michal - Křížek, Filip - Somer, L.
Dark matter and rotation curves of spiral galaxies.
Bulgarian astronomical journal. Roč. 25, April (2016), s. 64-77. ISSN 1313-2709
Grant CEP: GA MŠMT(CZ) LG15052
Institucionální podpora: RVO:67985840 ; RVO:61389005
Klíčová slova: red dwarf * dark matter * spiral galaxy
Obor OECD: Astronomy (including astrophysics,space science)
http://www.astro.bas.bg/AIJ/issues/n25/MKrizek.pdf

We suggest that nonbaryonic dark matter need not be taken into account to explain the observed rapid rotation of spiral galaxies. The main reason is a special form of the gravitational potential of a flat disk which guarantees large orbital velocities of stars at the galaxy edge. In particular, we prove that a star orbiting a central mass point along a circular trajectory of radius R has a smaller speed than if it were to orbit a flat disk of radius R and the same mass with an arbitrary rotationally symmetric density distribution.
Trvalý link: http://hdl.handle.net/11104/0261043