A survey of the latitude structure of galactic H I on small angular scales

Details A survey of the latitude structure of galactic H I on small angular scales A survey of the latitude structure of galactic H I on small angular scales

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apjs...54..513b&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 54, April 1984, p. 513-545.

Astronomy and Astrophysics

Astronomy

43

Astronomical Maps, Galactic Structure, Hydrogen Clouds, Milky Way Galaxy, Radio Sources (Astronomy), Absorption Spectra, Angular Resolution, Astronomical Catalogs, Centimeter Waves, H Lines, Self Absorption

Scientific paper

The 305 m Arecibo telescope was used to measure H I spectra at 4 arcmin angular resolution between galactic latitude b = -3 deg to 3 deg at 24 longitudes in the range l = 31.67-64.16 deg. Most longitudes were also observed with 11 arcmin resolution using the Green Bank 91 m telescope, and a few were observed at 21 arcmin resolution using the Green Bank 43 m telescope. The highest resolution spectra show numerous self-absorption features that arise in cool H I clouds. The mean free path between self-absorption features is less than 0.7 kpc near the plane. A catalog of 177 well-defined clouds detected in the Arecibo data is presented. The geometry of self-absorption makes it possible to resolve the distance ambiguity to the clouds. The mean length of a chord drawn randomly through one of these clouds is 13.4 pc; the median chord is 11 pc. The Arecibo survey is presented as a set of contour maps in v - b coordinates.

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