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Tuesday, March 27, 2012

Astronomy Picture of the Day

M82: Galaxy with a Supergalactic Wind 
From NASA's Astronomy Picture of the Day

What's lighting up the Cigar Galaxy? M82, as this irregular galaxy is also known, was stirred up by a recent pass near large spiral galaxy M81


This doesn't fully explain the source of the red-glowing outwardly expanding gas, however. Recent evidence indicates that this gas is being driven out by the combined emerging particle winds of many stars, together creating a galactic superwind.. 


The photographic mosaic below highlights a specific color of red light strongly emitted by ionized hydrogen gas, showing detailed filaments of this gas. 


The filaments extend for over 10,000 light years. The 12-million light-year distant Cigar Galaxy is the brightest galaxy in the sky in infrared light, and can be seen in visible light with a small telescope towards the constellation of the Great Bear (Ursa Major).







Image Credit: NASAESA, The Hubble Heritage Team, (STScI/AURA
Acknowledgement: M. Mountain (STScI), P. Puxley (NSF), J. Gallagher (U. Wisconsin)