2000/07/04 by José Franco, Jose Franco, J. A. García-Barreto +3 · 8 citations
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #Galaxy #Optics #Physics #Power law #Stellar, planetary, and galactic studies #Wavelength #astro-ph
paper · pdf · doi:10.1086/317189
published in The Astrophysical Journal 544(1), 277-282 (IOP Publishing) · Accepted for publication in the ApJ. 11 pages, 5 figures
arxiv created 2000/07/04 · openalex publication_date 2000/11/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A reanalysis of the radio continuum emission from circumnuclear regions of the barred galaxies NGC 1022, NGC 1326, and NGC 4314 is presented. The spatial distributions of Hα and radio continuum are similar and suggest the existence of several giant H II regions in the circumnuclear zone. The spectral indices of the H II regions, obtained with similar angular resolution and at three different wavelengths, indicate that in all three galaxies α > -0.1. This result suggests the existence of giant H II regions with decreasing density gradients. The average density stratifications of these H II regions could be approximated by power laws of the form n e ∝ r -ω , with exponents in the range 1.6 < ω < 2.4.