HS 1946 + 7658 - The most luminous QSO so far

Details HS 1946 + 7658 - The most luminous QSO so far HS 1946 + 7658 - The most luminous QSO so far

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253l...5h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 1, Jan. 1992, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

26

Astronomical Spectroscopy, Luminous Intensity, Lyman Spectra, Quasars, Red Shift, Line Spectra, Spectrophotometry

Scientific paper

The discovery of a bright, high-redshift QSO in the course of the Hamburg Survey for northern QSOs is reported. With z = 3.02 and V = 15.85, HS 1946 + 7658 is the apparently brightest QSO for z above 3 and the most luminous QSO so far found. It is more luminous than any known QSO. There is no evidence for variability or multiplicity so far. The luminosity and the strongest Lyman forest and metal absorption systems, as well as the possible incidence of Lyman limit cutoffs are discussed. There is no evidence for an optically thick Lyman limit system for wavelengths above 3400 A. This makes HS 1946 + 7658 a prime candidate for Hubble Space Telescope observations of He II 304, of He II forest lines, and of the He II equivalent of the Gunn-Peterson test for intergalactic helium.

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