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HII region

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HII region

In astronomy, region of extremely hot ionized hydrogen, surrounding one or more hot stars, visible as a bright patch or emission nebula in the sky. The gas is ionized by the intense ultraviolet radiation from the stars within it. HII regions are often associated with interstellar clouds in which new stars are being born. An example is the Orion nebula. The HII region takes its name from a spectroscopic notation in which HI represents neutral hydrogen (H) and HII represents ionized hydrogen (H+).
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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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