Decreasing Density Gradients in Circumnuclear HII Regions of Barred Galaxies NGC 1022, 1326 & 4314

A re-analysis of the radio continuum emission from circumnuclear regions of the barred galaxies NGC 1022, 1326 & 4314 is presented. The spatial distributions of Halpha and radio continuum are similar and suggest the existence of several giant HII regions in the circumnuclear zone. The spectral i...

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Bibliographic Details
Main Authors Franco, Jose, Garcia-Barreto, J. Antonio, de la Fuente, Eduardo
Format Journal Article
LanguageEnglish
Published 04.07.2000
Subjects
Physics - Astrophysics of Galaxies
Physics - Cosmology and Nongalactic Astrophysics
Physics - Earth and Planetary Astrophysics
Physics - High Energy Astrophysical Phenomena
Physics - Instrumentation and Methods for Astrophysics
Physics - Solar and Stellar Astrophysics
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Summary:A re-analysis of the radio continuum emission from circumnuclear regions of the barred galaxies NGC 1022, 1326 & 4314 is presented. The spatial distributions of Halpha and radio continuum are similar and suggest the existence of several giant HII regions in the circumnuclear zone. The spectral indices of the HII regions, obtained with similar angular resolution and at three different wavelengths, indicate that in all three galaxies, the spectral index, alpha^6_2 >-0.1. This result suggests the existence of giant HII regions with decreasing density gradients. The average density stratifications of these HII regions could be approximated by power-laws of the form n_e~r^-w, with exponents in the range 1.6 < w < 2.4.
DOI:10.48550/arxiv.astro-ph/0007040