Optically Thick HII Regions With Density Gradients in Barred Galaxies

Details Optically Thick HII Regions With Density Gradients in Barred Galaxies Optically Thick HII Regions With Density Gradients in Barred Galaxies

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ign..confe..14d&link_type=abstract

Ionized Gaseous Nebulae. Mexico City November 21- 24, 2000, meeting abstract

Physics

Scientific paper

A re-analysis of the radio continuum emission from circumnuclear regions of three barred galaxies is reported. 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 (20, 6, 2 cm), indicate that in all three galaxies α62 >-0.1. This result suggests the existence of optically thick giant H II regions with decreasing density gradients, most likely molecular clouds being disrupted by photoionization from newly formed stars. The average density stratifications of these these H II regions could be approximated by power-laws of the form ne∝ r-ω, with exponents in the range 1.6 < ω < 2.4.

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