Tag: Henize 2-10

A tiny galaxy that hides a big secret

By Phil Plait | January 11, 2011 11:30 am

Astronomers have just announced something that took me by surprise: the dwarf irregular galaxy named Henize 2-10 has a fairly beefy supermassive black hole in it! Here’s a picture of the galaxy:

[Click to unendwarfenate.]

The image is a composite of images from Hubble (red, green, and blue), radio images from the Very Large Array in New Mexico (yellow), and X-rays from the Chandra Observatory (purple). The cross marks the location of the black hole.

Henize 2-10 is pretty dinky, only about 3000 light years across — the Milky Way is 100,000 for comparison. It’s about 30 million light years away, which is kinda sorta close by, at least close enough to get a decent look at it. Now, we know that big galaxies like ours have these monster black holes in their very centers; the Milky Way’s is about 4 million times the mass of the Sun. Many galaxies have much larger ones, like Andromeda which harbors one 35 times as massive as ours.

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CATEGORIZED UNDER: Astronomy, Pretty pictures
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