Probable detection of H-alpha emission from a very high velocity cloud in Cetus

Details Probable detection of H-alpha emission from a very high velocity cloud in Cetus Probable detection of H-alpha emission from a very high velocity cloud in Cetus

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344l...9k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. L9-L11. Research supported by the Internat

Astronomy and Astrophysics

Astrophysics

62

H Alpha Line, H I Regions, Hydrogen Clouds, Interstellar Matter, Milky Way Galaxy, Brightness, Ultraviolet Radiation

Scientific paper

A high-sensitivity search for H-alpha emission from a -300 km/s H-I cloud in Cetus was performed using a large-aperture Fabry-Perot spectrometer. Weak emission features were noted in the H-alpha spectra at radial velocities coinciding with the 21-cm emission. The H-alpha surface brightness of the cloud is found to be 2.0 + or - 0.5 x 10 to the -8th ergs/sq cm per s per sr. The results are used to set an upper limit of 200,000/sq cm per s on the flux of Lyman-continuum photons in the vicinity of the cloud, almost a factor of 10 lower than the flux estimated to be present within the Galactic halo and comparable to some estimates for the intergalactic EUV radiation field.

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