Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13...42t&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
Characteristic mass-to-light ratios rise as we look from short distance scales to long ones; hence the concept of dark matter. A reasonable graph of the correlation could have been drawn as early as 1939 using the Oort limit for the solar neighborhood Hubble's inner galaxies Babcock's extended rotation curve of M31 Holmberg's binary galaxies and Zwicky's and Smith's masses for the Coma and Virgo clusters. Holmberg actually noted the trend in 1937. Additional kinds of data including X-ray temperatures and gravitational lensing have tended to support the original trend as have modern applications of the older techniques (e.g. the velocity dispersions of satellite galaxies in the SDSS data base announced the day this abstract was written). The talk will attempt to probe whether there are any serious unsolved dark matter problems for which astronomical observations are likely to provide a solution for instance halo shapes cusps vs. cores and self-interacting DM whether the largest structures still have a slightly smaller M/L than the global value of 278 and limits on particular sorts of particle DM from upper limits to their decay and annihilation products.
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