2006-06-12

low-luminosity galaxies

Blanton showed us some of his low-luminosity galaxy results in group meeting today. I was impressed that he can show that lower luminosity galaxies have similar baryon-to-dark-matter ratios to those of higher luminosity galaxies (though they have much higher mass-to-light ratios), showing that stellar winds and supernovae do not drive out gas preferentially in smaller galaxies. He also has reasonable evidence that the mass-velocity relation (the extension of the Tully-Fisher relation) at low masses is consistent with what one would expect if there is a CDM-predicted abundance of dark halos, occupied by galaxies in a more-or-less monotonic way by luminosity.

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