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physical object > natural object > celestial body > nebula > H II region > gaseous nebula > expanding emission nebula > supernova remnant

supernova remnant (SNR)
subject			fact

supernova remnant	has ejection velocity 10000 km s-1
	produces synchrotron radiation
	has acronym SNR
	has definition The expanding shell of gas ejected at high speed by a supernova explosion, observed as an expanding diffuse gaseous nebula, often with a shell-like structure.
	has definition A gaseous nebula, the expanding shell ejected by a supernova, and deriving its energy (at least in some cases) from the conversion by the remanent neutron star of its rotational energy into a stream of high-energy particles being continually accelerated in the SNR. About 100 SNRs are known in our Galaxy. Supernova remnants are usually powerful radio sources.
	is a kind of expanding emission nebula
	is a kind of radio source
radio source	has wavelength radio
	is a part of celestial sphere
	has catalog radio source catalog
expanding emission nebula	has composition enhanced with heavy elements relative to the interstellar medium
	has explosion date
	has progenitor star
	has expansion velocity
celestial body	has spectra
gaseous nebula	has synonym emission nebula
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
nebula	is a part of gas

Kinds of supernova remnant :

• Crab Nebula (13 facts) (M 1, Taurus A, 2U 0531+22) - A supernova remnant., A chaotic, expanding mass of gas in Taurus, the remnant of a Type I supernova whose light reached Earth in 1054. It is an intense radio source, and its visible light is strongly polarized. It is also a source of X-rays and gamma-rays. Its total mass is about 1 M_sun, but the total energy radiated by the Crab is 10³⁷-10³⁸ ergs s^-1. It is periodically occulted by the Moon, and every June its radio spectrum is occulted by the solar corona.
• Cygnus Loop (10 facts) (Veil Nebula, NG6 6992, Cygnus X-5) - A supernova remnant, consisting of a large loop of gas ejected from a star. It is 100 pc above the galactic plane. (X-ray observations give a distance of 2-3 kpc.) It is a thermal bremsstrahlung source of soft X-rays with a spectral temperature of 2 × 10⁶ K.
• Monoceros Loop (5 facts) - A filamentary supernova remnant resembling a loop.
• Puppis A (7 facts) (2U 0821-42) - A supernova remnant. It is an extended nonthermal radio source, and also a source of soft X-rays.
• Vela supernova remnant (3 facts) - A gaseous nebula in the middle of the Gum Nebula, the remnant of a Type II supernova whose light reached Earth about 10000 to 30000 years ago. It consists of bright filaments that form a D-shaped ring in Hα and a rough circle in the ultraviolet. It includes the Vela X, Y, and Z radio complexes and is a strong X-ray source.
• W44 (3 facts) - A radio source. It is a supernova remnant less than 0°.5 from the galactic plane.
• W51 (2 facts) - A radio source, a supernova remnant. PSR 1919+14 lies within its radio contours.

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