Even identifying which type of galaxy UGC 12591 is difficult -- featured on the lower left, 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 APOD
480 km/s is sorta meaningless, unless you specify and point on the disc. The rotational speed ought to be given as radians (or degrees) per second.
ReplyDeleteFrom what I have read, the galaxy tends to rotate as fast as the supermassive black hole in the center rotates. This one must be screaming.
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