H-alpha scans of high-velocity clouds

Details H-alpha scans of high-velocity clouds H-alpha scans of high-velocity clouds

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..553r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 15, 1987, p. 553-556.

Astronomy and Astrophysics

Astrophysics

24

Astronomical Spectroscopy, Galaxies, H Alpha Line, Molecular Clouds, Interstellar Matter, Radial Velocity

Scientific paper

No H-alpha emission has been found in a large-aperture Fabry-Perot spectrometer search for spectra toward six high-velocity clouds, down to detection limits of 0.2-0.6 R. The clouds seem to be located in a medium of low density, or high temperature, or both. The data obtained imply an ambient flux of ionizing radiation of less than 0.5-1.3 million photons/sq cm per sec at the clouds; this is less than the estimate of Bregman and Harrington (1986) for the Galactic halo.

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