Twenty-two emission-line AGNs from the HEAO-1 X-ray survey

Details Twenty-two emission-line AGNs from the HEAO-1 X-ray survey Twenty-two emission-line AGNs from the HEAO-1 X-ray survey

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.2079r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 6, p. 2079-2089, 2363-2365.

Astronomy and Astrophysics

Astronomy

16

Active Galactic Nuclei, Emission Spectra, Heao 1, X Ray Sources, Quasars, Seyfert Galaxies, Sky Surveys (Astronomy)

Scientific paper

We report 22 emission-line AGN as bright, hard X-ray sources. All of them appear to be new classifications with the exception of one peculiar IRAS source which is a known quasar and has no published spectrum. This sample exhibits a rich diversity in optical spectral properties and luminosities, ranging from a powerful broad-absorption-line quasar to a weak nucleus embedded in a nearby NGC galaxy. Two cases confer X-ray luminosities in excess of 10 exp 47 erg/s. However, there is a degree of uncertainty in the X-ray identification for the AGN fainter than V about 16.5. Optically, several AGN exhibit very strong Fe II emission. One Seyfert galaxy with substantial radio flux is an exception to the common association of strong Fe II emission and radio-quiet AGN. The previously recognized IRAS quasar shows extreme velocities in the profiles of the forbidden lines; the 0 III pair is broadened to the point that the lines are blended. Several of these AGN show evidence of intrinsic obscuration, illustrating the effectiveness of hard X-ray surveys in locating AGN through high column density.

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