An additional term of the Galactic tide due to dark matter

Details An additional term of the Galactic tide due to dark matter An additional term of the Galactic tide due to dark matter

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...534a.113n&link_type=abstract

Astronomy & Astrophysics, Volume 534, id.A113

Astronomy and Astrophysics

Astrophysics

Solar Neighborhood, Galaxy: Kinematics And Dynamics, Oort Cloud, Celestial Mechanics

Scientific paper

Aims: We aim to complete the formula characterizing the Galactic tide acting on the comets in the Oort Cloud with the term that describes the action of dark matter in the Galaxy. Methods: We analytically derive this term and gauge its amplitude for the current Galactic location of the Sun. Results: The amplitude of the new component of the tide, which acts in the radial direction from the Galactic centre, is estimated to be about 15% lower than that of the old, commonly considered radial component, so it should not be neglected in a precise calculations. And, since it depends on the distance r from the Galactic centre as r-2, it should certainly be considered when the Oort-Cloud dynamics is studied on a long-time scale assuming a radial migration of the Sun to shorter galactocentric distances.

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