What are cirrus point sources?

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Dust, Galactic Clusters, Point Sources, Radiant Flux Density, Red Shift, Faint Objects, Infrared Astronomy Satellite, Interstellar Gas, Interstellar Matter, Radio Emission, Sky Surveys (Astronomy), Star Formation, Statistical Analysis, Stellar Spectra

Scientific paper

Most cirrus point sources are associated with interstellar gas. A subset of these was isolated, together with other sources showing large band 4 to 3 flux density ratios, that are not associated with interstellar gas. Most of the point sources are associated with diffuse cirrus emissions. The sources appear to be distributed randomly on the sky, with the exception of six clusters, one of which is not associated with any known object. Six sources out of seventeen that were observed for redshifted H I at Arecibo were found to be associated with relatively nondescript external galaxies. Most of the sources do not appear on the Palomar Sky Survey. Deep optical observations of eight fields revealed some fairly distant galaxies, one object with a very peculiar optical spectrum, and several blank fields.

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