Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ysc..conf...25s&link_type=abstract
YSC'15 Proceedings of Contributed Papers (eds. Choliy V. Ya., Ivashchenko G.), pp. 25-28
Mathematics
Logic
Scientific paper
The ΛCDM cosmological model, which is widely used, predicts that non-baryonic component of the Universe mass-energy density amounts to about 25%. Standard scenario of galaxy formation within ΛCDM cosmology implies that spiral galaxies should be surrounded by CDM halo. However, predicted distribution of dark matter in galactic halos seems to be incompatible with observations, for example, of dwarf satellite galaxies. We tested the hypothesis of spherical symmetry of CDM distribution in spiral galaxies and found that 17% of galaxies fail that test. For such non-spherically-symmetric galaxies we use disk matter distribution, as most reasonable choice. We obtain the mass distribution of the disk by applying Iterative Spectral Method. We also take into consideration HI distribution and He contribution to the total mass distribution. The results show that for 5 galaxies with full data, the mass - luminosity ratio in K-band is lower than 4. This suggests that in considered spiral galaxies the amount of dark matter is smaller (if any) than previousely assumed.
Bratek Łukasz
Jałocha-Bratek J.
Kutschera Marek
Skindzier Piotr
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