A NEW ESTIMATE FOR THE DISPERSION VELOCITY OF GALACTIC DARK-MATTER PARTICLES

Authors
ZHU ZH WU JH ZHANG YZ
Citation
Zh. Zhu et al., A NEW ESTIMATE FOR THE DISPERSION VELOCITY OF GALACTIC DARK-MATTER PARTICLES, Chinese Physics Letters, 15(8), 1998, pp. 617-619
Citations number
18
Categorie Soggetti
Physics
Journal title
Chinese Physics Letters → ACNP
ISSN journal
0256307X
Volume
15
Issue
8
Year of publication
1998
Pages
617 - 619
Database
ISI
SICI code
0256-307X(1998)15:8<617:ANEFTD>2.0.ZU;2-7
Abstract
An independent method is proposed to estimate the dispersion velocity of galactic dark matter particles. This method is based on the observe d quasar-galaxy association samples that are caused by gravitational l ensing. All resulting dispersion velocities are much higher than simil ar to 220 km.s(-1), a value expected from the virial theorem, which sh ows that the conventional assumption of virialization may be invalid i n the halo regions of galaxies.