H-alpha scans of the intergalactic H I cloud in Leo

Details H-alpha scans of the intergalactic H I cloud in Leo H-alpha scans of the intergalactic H I cloud in Leo

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309l...9r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

39

Emission Spectra, H Alpha Line, Hydrogen Clouds, Intergalactic Media, Radio Spectra, Astronomical Spectroscopy, Brightness Distribution, Electron Density (Concentration)

Scientific paper

A high-sensitivity search has been made for Hα emission from the large, intergalactic H I cloud discovered by Schneider et al. (1983). The authors are able to place a conservative upper limit of 1.7×10-7ergs cm-2s-1sr-1 on the Hα surface brightness of the cloud, which corresponds to an emission measure through the cloud of <2 cm-6pc. The data also provide evidence (at about the 4σ level of significance) for the actual detection of Hα emission at 7×10-8ergs cm-2s-1sr-1.

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