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- Title
Hα emission from gaseous structures above galactic discs.
- Authors
Vasiliev, Evgenii O.; Drozdov, Sergey A.; Shchekinov, Yuri A.
- Abstract
Extraplanar structures of ionized gas are detected in numerous edge-on galaxies. Whether HII regions or supernovae (SNe) responsible for its ionization is still debated. Here, we consider the Hα emissivity from shells of superbubbles driven by SNe explosions in a stellar cluster located either in the midplane or above the midplane of the disc. We found that these shells form filamentary structures emitting brightly in Hα line at height of ~0.6-1.6 kpc above the disc depending on cluster location and gas metallicity. The Hα surface brightness ranges within - ~10-17-10-16 erg s-1 cm-2 arcsec-2 are close to the values observed in edge-on galaxies. We conclude that the Hα emission of extraplanar structures can be explained by recombination in collisionally ionized gas of unstable shells driven by multiple SNe.
- Subjects
SUPERNOVAE; CATACLYSMIC variable stars; GALACTIC X-ray sources; SUPERNOVA remnants; GALAXIES
- Publication
Open Astronomy, 2022, Vol 31, Issue 1, p99
- ISSN
2543-6376
- Publication type
Article
- DOI
10.1515/astro-2022-0012