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

1984; Institute of Physics; Volume: 54; Linguagem: Inglês

10.1086/190942

1538-4365

T. M. Bania, Felix J. Lockman,

Astronomy and Astrophysical Research

view Abstract Citations (50) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A survey of the latitude structure of galactic HI on small angular scales. Bania, T. M. ; Lockman, F. J. Abstract 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. Publication: The Astrophysical Journal Supplement Series Pub Date: April 1984 DOI: 10.1086/190942 Bibcode: 1984ApJS...54..513B Keywords: Astronomical Maps; Galactic Structure; Hydrogen Clouds; Milky Way Galaxy; Radio Sources (Astronomy); Absorption Spectra; Angular Resolution; Astronomical Catalogs; Centimeter Waves; H Lines; Self Absorption; Astronomy full text sources ADS | data products SIMBAD (17) NED (2)