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physical object > natural object > celestial body > collection of stars > galaxy > emission line galaxy

emission line galaxy
subject			fact

emission line galaxy	has emission lines
	is a kind of galaxy
galaxy	has number of stars 106 to 1012
	has catalog galaxy catalog
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of emission line galaxy :

• Haro galaxy (2 facts) - Blue object whose spectra show sharp emission lines.
• Markarian galaxy (2 facts) - A galaxy in Markarian's list of galaxies with abnormally strong ultraviolet continua. They have broad emission lines arising in a bright, semi-stellar nucleus. Markarian 231 is the most luminous galaxy known if it is at its Hubble distance.
• narrow emission line galaxy (2 facts) (NELG)
• narrow emission line X-ray galaxy (2 facts) (NLXG)
• violent galaxy (3 kinds, 19 facts) (eruptive galaxy, exploding galaxy) - A type of galaxy differentiated only recently. Violent galaxies include QSOs and exploding galaxies like M82. About 1 percent of the galaxies are classified as violent. Violent galaxies release on the average 10⁵⁸ ergs of energy, compared with a supernova release of 10⁴⁹ ergs. Nearest violent galaxy is Cen A.