The bell laboratories H I survey

Antony A. Stark, Charles F. Gammie, Robert W. Wilson, John Bally, Richard A. Linke, Carl Heiles, Mark Hurwitz

Research output: Contribution to journalArticlepeer-review


The sky north of δ= -40° was observed in the 21 cm line of atomic hydrogen with the FWHM = 2° beam of the 20 foot horn reflector at AT&T Bell Laboratories, Crawford Hill. The survey covers a velocity range of 654 km s-1 centered on the Galactic standard of rest, with 5.3 km s-1 wide filters. Calibration and reduction of the observations are described. The survey is presented as a series of images of the sky, each covering a 10 km s-1 wide velocity range. This survey is distinguished by its sensitivity to low surface brightness features ( TA ≈ 50 mK) and relative freedom from sidelobe contamination. High-velocity clouds are extracted and cataloged automatically. At the resolution of the survey, the lowest H I column density in the sky is 5.7 × 1019 cm-2.

Original languageEnglish (US)
Pages (from-to)77-104
Number of pages28
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - Mar 1992
Externally publishedYes


  • ISM: general
  • Radio lines: atomic
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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