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Two Surprises in NGC 891

Event Details

Event Dates: 

Friday, April 6, 2012 - 6:00am

Speaker Name(s): 

Edmund Hodges-Kluck

Speaker Affiliation(s): 

University of Michigan
Seminar Type/Subject

Event Details & Abstract: 

NGC 891 is a nearby, edge-on spiral galaxy thought to be a Milky Way analog. A recent XMM-Newton observation of the galaxy revealed two unexpected results: (1) a new, possibly transient ultraluminous X-ray source has turned on since the last X-ray observation in 2006, and (2) the metallicity of the hot halo suggests that NGC 891 lacks a 'galactic fountain' of stellar/supernova feedback despite circumstantial evidence in other wavebands. I will discuss these findings and their context, and briefly preview preliminary results on using the hot halo to constrain the shape of the dark matter halo.