H II region Comparison Table

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H II region comparison table

Subject has catalog has definition has synonym

compact H II region nebula catalog A dense (n_e ≥ 10³ cm^-3) H II region of small linear dimensions (≤ 1 pc).

gaseous nebula gaseous nebula catalog An H II region, a supernova remnant, or a planetary nebula. H II regions have an emission-line optical spectrum, and a thermal continuous spectrum declining in intensity as the wavelength increases (from maximum in the ultraviolet) through infrared and radio. Supernova remnants have an emission-line optical spectrum and a nonthermal radio spectrum. Temperatures of planetary nebulae are much higher than those of H II regions. emission nebula

H II condensation nebula catalog A high-density H II region.

Subject	has catalog	has definition	has synonym
compact H II region	nebula catalog	A dense (n_e ≥ 10³ cm^-3) H II region of small linear dimensions (≤ 1 pc).
gaseous nebula	gaseous nebula catalog	An H II region, a supernova remnant, or a planetary nebula. H II regions have an emission-line optical spectrum, and a thermal continuous spectrum declining in intensity as the wavelength increases (from maximum in the ultraviolet) through infrared and radio. Supernova remnants have an emission-line optical spectrum and a nonthermal radio spectrum. Temperatures of planetary nebulae are much higher than those of H II regions.	emission nebula
H II condensation	nebula catalog	A high-density H II region.

Next nebula: reflection nebula Up: nebula Previous nebula: dark nebula