High Resolution Optical Velocity Fields of LSB Galaxies and the Density Profiles of Dark Matter Halos

Details High Resolution Optical Velocity Fields of LSB Galaxies and the Density Profiles of Dark Matter Halos High Resolution Optical Velocity Fields of LSB Galaxies and the Density Profiles of Dark Matter Halos

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911202k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #112.02; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present high resolution Halpha velocity fields and derived rotation curves of a sample of almost two dozen low surface brightness galaxies. The velocity fields have been obtained using the DensePak Integrated Field Unit on the WIYN telescope. These observations test the basic tenant of cold dark matter structure formation that galaxy mass halos should be cuspy. We find the data to show that the dark matter density profiles are of lower density and more core-like than predicted in a LambdaCDM cosmology. We also use the two-dimensional data to test for the presence of noncircular motions and their effect on the interpretation of the observations. This research was supported by NSF grant 0505956.

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