Subarcsecond-Resolution Radio Maps of Nearby Spiral Galaxies

Simple item page
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.accessioned2026-07-07T11:25:59Z
dc.date.available2026-07-07T11:25:59Z
dc.descriptionWe report subarcsecond-resolution VLA imaging of four nearby spiral galaxies: IC 342, Maffei II, NGC 2903, and NGC 6946. In each galaxy, compact radio continuum sources are identified in the central ~ 15" x 15" region. These compact sources are responsible for 20 - 30 % of the total emission from the central kpc of the host galaxies at 2 cm, but only ~ 5 - 10 % at 6 cm. More than half of the compact sources appear to be HII regions. The HII regions with rising spectra must be fairly dense (n_i ~ 10^4 cm^(-3)) and are presumably very 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. Thermal free-free emission from compact sources contributes more significantly at 2 cm, while diffuse synchrotron emission dominates at 6 cm. The radio HII regions are found near the centers of giant molecular clouds in projection, and do not have obvious visual counterparts.
dc.description48 pages, 6 figures. Accepted for publication in AJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0609212
dc.identifierhttp://arxiv.org/abs/astro-ph/0609212
dc.identifierAstron.J.132:2383-2397,2006
dc.identifierdoi:10.1086/508373
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195685
dc.subjectAstrophysics
dc.titleSubarcsecond-Resolution Radio Maps of Nearby Spiral Galaxies
dc.typetext

Files

Collections

arXiv