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View Full Version : Black Holes and Dark Matter: Tag! You’re It…



Fraser
2011-Jan-20, 08:40 PM
We only know they’re there because we can feel them in the dark… Feel their gravity, that is. Like a hide-and-go-seek game played on a moonless summer’s night, we only know that black holes and dark matter exist because we can feel the mass tagging us from beyond what our eyes can see. Are there [...]

More... (http://www.universetoday.com/82685/black-holes-and-dark-matter-tag-youre-it/)

trinitree88
2011-Jan-22, 05:42 PM
We only know they’re there because we can feel them in the dark… Feel their gravity, that is. Like a hide-and-go-seek game played on a moonless summer’s night, we only know that black holes and dark matter exist because we can feel the mass tagging us from beyond what our eyes can see. Are there [...]

More... (http://www.universetoday.com/82685/black-holes-and-dark-matter-tag-youre-it/)

Fraser. Interesting paper. Much remains to be seen here. Not all scientists think that the "dark matter", inferred by non-Keplerian galactic rotation curves has to be of the non-baryonic matter of the exotic variety. There remains yet the elucidation to which molecular hydrogen, which contributes tricky observational technique problems, constitutes the majority of dark matter halos. The current thinking has focused primarily on associations of atomic hydrogen and it's ionized companion making H-alpha isophotes coincident with galactic mass/luminosity bulges. However large quantities of molecular hydrogen are showing up in recently coined MOHEGS...molecular hydrogen emitting galaxies.
There stands a chance, depending upon column densities, of seeing GRB's traversing molecular clouds, ionizing them, lighting them up in H-alpha and simultaneously photodissociating dust grain nuclei that were responsible for the molecular cloud formations eons ago. With timescales of recombination running thousands of years and up, these light shows should look like millenia long fireworks. Instead of Fourth of July fireworks this year, picture a slo-mo version running continuosly in your favorite galaxy's halo, slowly indicating over decades the presence of pretty mundane, ubiquitous hydrogen as the culprit in "dark matter". pete