The Bell Laboratories H I survey

TLDR

The survey mapped the sky north of δ = –40° in 21‑cm H I using 5.3‑km s⁻¹ wide filters over a 654‑km s⁻¹ range, calibrated and reduced the data, and produced a series of 10‑km s⁻¹‑wide velocity images with automatically extracted high‑velocity cloud catalogs. The survey achieved a sensitivity of ≈50 mK, enabling detection of low‑surface‑brightness H I and revealing the lowest column density in the sky at 5.7 × 10¹⁹ cm⁻², while minimizing sidelobe contamination. Published in ApJS (1992) DOI 10.1086/191645; data archived in ADS and CDS.

Abstract

view Abstract Citations (1216) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Bell Laboratories H i Survey Stark, Antony A. ; Gammie, Charles F. ; Wilson, Robert W. ; Bally, John ; Linke, Richard A. ; Heiles, Carl ; Hurwitz, Mark Abstract Results of observations of the sky north of delta = -40 deg in the 21-cm line of atomic hydrogen are reported. The survey covers a velocity range of 654 km/s centered on the Galactic standard of rest, with 5.3-km/s 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 wide velocity range. This survey is distinguished by its sensitivity to low surface brightness features (TA is approximately equal to 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 x 10 exp 19/cm. Publication: The Astrophysical Journal Supplement Series Pub Date: March 1992 DOI: 10.1086/191645 Bibcode: 1992ApJS...79...77S Keywords: H I Regions; Hydrogen Atoms; Interstellar Matter; Line Spectra; Radio Spectra; Sky Surveys (Astronomy); Emission Spectra; Interstellar Extinction; Milky Way Galaxy; Astronomy; ISM: GENERAL; RADIO LINES: ATOMIC; SURVEYS full text sources ADS | data products CDS (6) Related Materials (3) Catalog: 1993yCat.8010....0S Catalog: 1994yCat..20790077S Catalog: 1995yCat.8028....0S