The galactic surface density derived from K giants

Details The galactic surface density derived from K giants The galactic surface density derived from K giants

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007an....328..178b&link_type=abstract

Astronomische Nachrichten, Vol.328, Issue 2, p.178

Astronomy and Astrophysics

Astronomy

1

Stars: K Giants, Stars: Kinematics, Cosmology: Dark Matter

Scientific paper

We compare the W velocity dispersions of Brosche, Schwan & Schwarz (2001) with more recent results. The increase with the distance |z| from the galactic plane is confirmed, although perhaps with reduced amplitude. This could be interpreted either as one homogenous population or as a superposition of (at least) two populations with two constant dispersions and two scale heights. For each of the possibilities we propose a simple model. Combined with two observational variants for the velocity variation, we obtain surface densities up to |z| = 250 pc ranging from 5 to 44 M_&sun; pc-2. Thus the case for considerable dark matter in the neighbourhood of the galactic plane is not supported

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