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HII region

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HII region  (cht)
A cloudlike region in space where the interstellar medium consists of ionized rather than neutral hydrogen. HII regions are centered around stars with very high surface temperatures and brilliant luminosities, whose radiant energy is sufficient to heat the interstellar medium to the point that hydrogen is ionized. The most conspicuous and best-known HII region is the Orion Nebula.
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40, the source was considered an SNR; otherwise, it was assumed to be an HII region.
A search for extragalactic supernova remnants. (South Carolina ... by Mentor, Guy; Payne, James E. / Bulletin of the South Carolina Academy of Science
The ration of the optical [SII] emmisson line to the Halpha emission line is the primary means to identify supernova remnants (SNR) and HII regions and confirm the radio identification of each source.
Optical confirmation of possible SNR radio sources by Mentor, Guy; Payne, James E.; Sweat, Tia; Cayton, Leah; Lacey, Christina / Bulletin of the South Carolina Academy of Science
 
 
 
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