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Astronomy Colloquium

Thursday, October 8, 2015
4:00 AM
411 West Hall

"Lonely Galaxies: The Baryon Content of Isolated Dwarf Galaxies"

"Lonely Galaxies:  The Baryon Content of Isolated Dwarf Galaxies"


Environment plays a major role in the evolution of galaxies. This is particularly true of low mass dwarf galaxies where more massive galaxies dramatically affect the local gravitational potential. Isolated galaxies offer a unique test bed for comparisons to theoretical models where the complicating physics of galaxy–galaxy interactions are minimized.   For galaxies less massive than M_star < 10^9 M_sun, we have shown that ending star-formation requires the presence of a more massive neighbor.    I will discuss follow-up HI observations in these systems and discuss the implications of these results for quenching mechanisms at all scales.

Marla Geha, Yale