An all-sky search for molecular cirrus clouds

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Radiation, Interstellar Gas, Molecular Clouds, Sky Surveys (Astronomy), Stellar Coronas, Zodiacal Light, Emission Spectra, Interstellar Matter, Milky Way Galaxy, Pixels

Scientific paper

The infrared (IR) brightness of the sky, once the zodiacal light is removed, has been shown to be highly correlated with the total gaseous (H I and H2) content of the interstellar medium. The authors have used this correlation to deduce a map of infrared-excess gas by subtracting, in an appropriate way, the H I component from the infrared brightness. The method is limited to part of the sky where the heating of the dust is relatively uniform and allows the identification of the nearby molecular clouds at high Galactic latitude and/or the clouds which have local heating sources or a larger dust-to-gas ratio than the average. An all-sky map and a catalog of 516 significant IR-excess clouds are presented and statistically analyzed. About half the CO clouds at |b| ⪆ 25° observed by Magnani, Blitz, and Mundy coincide with entries in this catalog.

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