Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....86..304m&link_type=abstract
Astronomy and Astrophysics, vol. 86, no. 3, June 1980, p. 304-307.
Astronomy and Astrophysics
Astrophysics
22
Astrophysics, Extragalactic Radio Sources, Brightness, Cosmic Dust, Electrophotometers, Fabry-Perot Interferometers, Gas Dynamics, H Ii Regions, Hydrogen Ions, Stellar Winds
Scientific paper
A detailed study is presented of the core-halo structure of the largest H II region in M 33, NGC604, using newly obtained multi-aperture H-beta photometry and Fabry-Perot interferometry, in conjunction with published radio continuum observations. Based on a comparison between the radio continuum and H-beta luminosities of NGC604, a dust density of 6 x 10 to the -25th g/cu cm is derived for the nebular core, in good agreement with published far-infrared results. By contrast, the halo NGC604 appears to contain virtually no dust. It is also shown that the turbulent component of the H-alpha-line profile width of the halo of NGC604 is significantly lower than that of the nebular core. This result is found to be consistent with models in which the highly supersonic velocities implied by the observed emission line profile widths in both nebular components are interpreted in terms of expansion motions.
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