Accurate galactic N(H) values towards quasars and AGN

Details Accurate galactic N(H) values towards quasars and AGN Accurate galactic N(H) values towards quasars and AGN

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..777e&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 777-782.

Astronomy and Astrophysics

Astronomy

357

Active Galactic Nuclei, Quasars, Sky Surveys (Astronomy), X Ray Sources, Brightness Temperature, H Lines, Heao 2, Radiation Spectra, Signal To Noise Ratios

Scientific paper

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.

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