Accurate galactic N(H) values towards quasars and AGN
| Title: | Accurate galactic N(H) values towards quasars and AGN |
| Author: |
Elvis, Martin; Wilkes, Belinda Jane; Lockman, Felix J.
Note: Order does not necessarily reflect citation order of authors. |
| 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. |
| Full Text & Related Files: |
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| 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. |
| Published Version: | doi:10.1086/115022 |
| Other Sources: | http://adsabs.harvard.edu/abs/1989AJ.....97..777E |
| Terms of Use: | This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA |
| Citable link to this page: | http://nrs.harvard.edu/urn-3:HUL.InstRepos:30212152 |
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