High Resolution Radio Maps of Four Nearby Spiral Galaxies

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dc.creatorTsai, Chao-Wei
dc.creatorTurner, Jean L.
dc.creatorBeck, Sara C.
dc.creatorCrosthwaite, Lucian P.
dc.creatorHo, Paul T. P.
dc.creatorMeier, David S.
dc.creator;
dc.date2006-09-08
dc.date.accessioned2026-07-07T07:23:10Z
dc.date.available2026-07-07T07:23:10Z
dc.descriptionWe report subarcsecond-resolution VLA imaging of the centers of four nearby spiral galaxies: IC 342, Maffei II, NGC 2903, and NGC 6946. In each galaxy, 7 - 12 compact radio continuum sources were identified within the central 15" x 15". Slightly over half of the compact sources appear to be HII regions with flat or positive spectral indices (alpha >~ -0.1). The HII regions with rising spectra are optically thick at centimeter wavelengths, and thus dense (n_i ~ 10^4 cm^(-3)) and young. The largest of these HII regions require the excitation of 500 - 800 O stars, within regions of only few parsecs extent. These clusters approach the sizes expected for globular clusters.
dc.description4 pages including 2 figures. Proceedings of East Asian Young Astronomers Meeting, Kiyosato, Japan, February 2006
dc.identifierhttps://arxiv.org/abs/astro-ph/0609210
dc.identifierhttp://arxiv.org/abs/astro-ph/0609210
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/115879
dc.subjectAstrophysics
dc.titleHigh Resolution Radio Maps of Four Nearby Spiral Galaxies
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