Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21910603o&link_type=abstract
American Astronomical Society, AAS Meeting #219, #106.03
Mathematics
Logic
Scientific paper
We present high resolution rotation curves and mass models of 34 nearby dwarf galaxies culled from LITTLE THINGS. The high-resolution HI observations ( 6" angular; < 2.6 km/s velocity resolution) of LITTLE THINGS enable us to derive reliable rotation curves of the galaxies in a homogeneous and consistent manner. The rotation curves are combined with Spitzer archival 3.6 micron and ancillary optical UBV images to construct mass models. The high quality multi-wavelength dataset significantly reduces observational uncertainties and thus allows us to examine in detail the dark matter distribution in the galaxies. We compare the derived dark matter distributions of the sample galaxies with those of dwarf galaxies from The HI Nearby Galaxy Survey (THINGS). From this, we find that they are consistent with each other in terms of (1) the rotation curve shape, showing a linear increase in the inner regions, and (2) a shallow slope of the mass density in the inner parts, resulting in dark matter halos characterised by a core. This is in contrast with classical dark-matter-only cosmological simulations, which predict a steep rotation curve in the central region and steep inner slope of the dark matter density profiles. Instead, our results are more in line with shallower slopes found in LambdaCDM simulations of dwarf galaxies in which the effect of baryonic feedback processes is included.
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