Accurate galactic N(H) values towards quasars and AGN | Zendy

M. Elvis | Zendy; B. J. Wilkes | Zendy; Felix J. Lockman | Zendy

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Accurate galactic N(H) values towards quasars and AGN

Author(s) -

M. Elvis,

B. J. Wilkes,

Felix J. Lockman

Publication year - 1989

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/115022

Subject(s) - physics , quasar , astrophysics , active galactic nucleus , galaxy , astronomy , milky way , opacity , redshift , interstellar medium , sky , declination , optics

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. 24 references.

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