Seyfert galaxy

Seyfert galaxy

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Caption: Seyfert galaxy. Optical image of the Seyfert galaxy NGC 4945 (upper centre), an edge-on spiral galaxy in the constellation Centaurus. Seyfert galaxies have an unusually bright nucleus. The nucleus of this galaxy is a Seyfert type 2 nucleus, which does not appear unusually bright at visible wavelengths, but is a powerful emitter of infrared radiation. The power source for a Seyfert nucleus is thought to be a large black hole. The stars Xi 1 Centauri (upper right) and Xi 2 Centauri (lower left) are also seen.

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Keywords: active, astronomy, astrophysics, centaurus, cosmology, edge-on, galactic, galaxy, ngc 4945, nucleus, science, seyfert, space, spiral galaxy, type 2, xi 1 centauri, xi 2 centauri

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