Accurate galactic N(H) values towards quasars and AGN
Citation
Elvis, Martin, Belinda J. Wilkes, and Felix J. Lockman. 1989. “Accurate Galactic N(H) Values Towards Quasars and AGN.” The Astronomical Journal 97 (March): 777. doi:10.1086/115022.Abstract
Integrated Galactic 21-cm column densities toward about 174 quasars and AGN are presented. The data are corrected for stray radiation, using the technique of Lockman et al. (1986). Because of the 21-arcmin beam size of the 140-ft telescope used in the study, the uncertainty in N(H) due to angular variations in the H I of the Galaxy at high latitudes is minimized. The column densities are accurate to about 1 X 10 to the 19th atoms/sq cm, or 5 percent, whichever is larger. Errors above N(H) of about 4 X 10 to the 20th atoms/sq cm are dominated by opacity uncertainties.Other Sources
http://adsabs.harvard.edu/abs/1989AJ.....97..777ETerms of Use
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