Structure of dark halos: Model-independent information from HI rotation curves

Details Structure of dark halos: Model-independent information from HI rotation curves Structure of dark halos: Model-independent information from HI rotation curves

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasa...14...11s&link_type=abstract

Publications Astronomical Society of Australia, vol. 14, no. 1, p. 11-14

Astronomy and Astrophysics

Astronomy

4

Galaxies, Kinetics & Dynamics

Scientific paper

Although the approximately flat rotation curves of gas in the outskirts of spirals is generally taken as strong evidence for spherical, isothermal dark matter halos, this conclusion is often incorrect and always model-dependent. A re-examination of the old and (nearly) model-independent inversion technique for determining the surface mass density of galaxies from their kinematics is presented. The method is shown to be relatively insensitive to noise in the kinematics. Due to incomplete kinematical knowledge at large radius, however, the surface mass density is reliable only in the inner half of the galaxy, a result that also applies to traditional rotation curve fitting techniques.

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