Low-frequency radio continuum evidence for cool ionized gas in normal spiral galaxies

Details Low-frequency radio continuum evidence for cool ionized gas in normal spiral galaxies Low-frequency radio continuum evidence for cool ionized gas in normal spiral galaxies

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352...30i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, March 20, 1990, p. 30-43.

Astronomy and Astrophysics

Astronomy

42

Cold Gas, Ionized Gases, Radio Sources (Astronomy), Spiral Galaxies, Absorption Spectra, Electron Energy, Emission Spectra, Flux Density, H Ii Regions

Scientific paper

A 57.5-MHz survey of a total of 133 (mostly late-type spiral) galaxies has resulted in the detection of 68. The ratio of observed intensities to intensities extrapolated from higher-frequency measurements is well correlated with the axial ratio of the observed galaxies, and is interpretable due to increasing free-free absorption of nonthermal emission in galaxy disks with increasing tilt. The implied free-free absorption is interpreted as due to the pervasive presence of a clumpy medium of well-mixed, nonthermally emitting, thermally absorbing gas with small filling factor.

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