Globular clusters as a new constraint for the potential of our Galaxy.

Details Globular clusters as a new constraint for the potential of our Galaxy. Globular clusters as a new constraint for the potential of our Galaxy.

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...300..117d&link_type=abstract

Astronomy and Astrophysics, v.300, p.117

Astronomy and Astrophysics

Astrophysics

34

Galaxy: Dynamics Of, Structure Of, Halo, Dark Matter

Scientific paper

We use space motions of globular clusters as a new constraint to determine the mass distribution of our Galaxy. Among the 26 globular clusters with known radial velocity and proper motions (Dauphole et al. ???), eight of them are now observed at distances smaller than or nearly 20kpc from the Galactic centre with a velocity that throws them at a distance greater than 40kpc, with the usual galactic potentials. Moreover, the time spent at large distances from the Galactic centre corresponds to a large part of the orbital period. Statistically, we must normally find a lot of globular clusters at these distances. But the distribution of the globular clusters shows a gap beyond 40kpc. We use this contradiction between observations and theory as a new constraint to build a potential model of our Galaxy, that is globular clusters with known space velocities must not have apocentric distances greater than 40 kpc or in other words the potential must be strong enough to prevent galactic globular clusters to go beyond this limit. The derived model is simple, completely analytical and works quite nicely with this large scale constraint. Total mass of the model is 7.9x10^11^Msun_. A large part of this mass must be distributed between 15 and 40kpc and must be in fact dark matter.

Affiliated with

Also associated with

No associations

Rating

Globular clusters as a new constraint for the potential of our Galaxy. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Globular clusters as a new constraint for the potential of our Galaxy., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Globular clusters as a new constraint for the potential of our Galaxy. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1265313