The discovery of eight bright active galactic nuclei observed with the HEAO 1 scanning modulation collimator

Details The discovery of eight bright active galactic nuclei observed with the HEAO 1 scanning modulation collimator The discovery of eight bright active galactic nuclei observed with the HEAO 1 scanning modulation collimator

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..742r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 15, 1986, p. 742-752.

Astronomy and Astrophysics

Astronomy

68

Active Galactic Nuclei, Astronomical Spectroscopy, Quasars, Seyfert Galaxies, Spaceborne Astronomy, X Ray Sources, Collimators, Emission Spectra, H Lines, Heao 1, Red Shift, Visible Spectrum

Scientific paper

Eight active galactic nuclei (AGNs; seven type 1 Seyferts and one QSO) are reported. They are 14th and 15th mag objects with broad hydrogen lines and redshifts in the range 0.026 < z < 0.138. The AGNs were discovered in a systematic program to identify the fainter X-ray sources of the HEAO 1 survey. The X-ray and optical luminosities and many of the optical emission features of these AGNs resemble other bright and nearby Seyfert 1 galaxies. However, three of the galaxies exhibit very strong Fe II emission, and two additionally show very weak forbidden line spectra similar to I Zw 1. One of the I Zw 1 types, the previously unidentified radio source PKS 0558-504, is a QSO with unusually narrow hydrogen lines. Photometric magnitudes and the intensities of selected emission lines are given for each of the AGNs.

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