UGC

UGC 12591: The Fastest Rotating Galaxy Known : Why does this galaxy spin so fast? To start, even identifying which type of galaxy UGC 12591 is difficult it has dark dust lanes like a spiral galaxy but a large diffuse bulge of stars like a lenticular. Surprisingly observations show that UGC 12591 spins at about 480 km/sec, almost twice as fast as our Milky Way, and the fastest rotation rate yet measured. The mass needed to hold together a galaxy spinning this fast is several times the mass of our Milky Way Galaxy. Progenitor scenarios for UGC 12591 include slow growth by accreting ambient matter, or rapid growth through a recent galaxy collision or collisions future observations may tell. The light we see today from UGC 12591 left about 400 million years ago, when trees were first developing on Earth. via NASA

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Arp 273, two interacting spiral galaxies (UGC 1810 and UGC 1813) | Motion Effect by rexisky 

Why does this galaxy spin so fast? 

To start, what kind of galaxy is this? It’s hard to tell.. It has dark dust lanes like a spiral galaxy but a large diffuse bulge of stars like a lenticular galaxy. 

Surprising observations show that UGC 12591 spins at about 480 km/sec, almost twice as fast as our Milky Way- the fastest rotation rate yet measured! The mass needed in order to hold a galaxy together that is spinning this fast is several times the mass of our Milky Way. Scenarios as to why this is happening with UGC 12591 include slow growth by accrediting ambient matter, or rapid growth through a recent galaxy collision or collisions. Future observations may be able to help us tell. 

The light we see today from UGC 12591 left about 400 million years ago, when trees were first developing on Earth!

Image Credit: NASA, ESA, Hubble