High-Resolution Rotation Curves of Low Surface Brightness Galaxies. II. Mass Models

Details High-Resolution Rotation Curves of Low Surface Brightness Galaxies. II. Mass Models High-Resolution Rotation Curves of Low Surface Brightness Galaxies. II. Mass Models

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....122.2396d&link_type=abstract

The Astronomical Journal, Volume 122, Issue 5, pp. 2396-2427.

Astronomy and Astrophysics

Astronomy

200

Cosmology: Dark Matter, Galaxies: Fundamental Parameters, Galaxies: Kinematics And Dynamics

Scientific paper

We present mass models for a sample of 30 high-resolution rotation curves of low surface brightness galaxies. We fit both pseudoisothermal (core dominated) and cold dark matter (CDM; cusp dominated) halos for a wide variety of assumptions about the stellar mass-to-light ratio. We find that the pseudoisothermal model provides superior fits. CDM fits show systematic deviations from the data and often have a small statistical likelihood of being the appropriate model. The distribution of concentration parameters is too broad, and has too low a mean, to be explained by low-density, flat CDM (ΛCDM). This failing becomes more severe as increasing allowance is made for stellar mass: Navarro, Frenk, & White (NFW) model fits require uncomfortably low mass-to-light ratios. In contrast, the maximum disk procedure does often succeed in predicting the inner shape of the rotation curves, but it requires uncomfortably large stellar mass-to-light ratios. The data do admit reasonable stellar population mass-to-light ratios if halos have cores rather than cusps.

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