1.3k citations · 23.5k across the 260 of their papers we have counts for
Showing 1997Show all
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astro-ph1997★ 1 cited
Patchy intergalactic HeII absorption in HE 2347-4342. - The possible discovery of the epoch of He-reionization
D. Reimers, S. Koehler, L. Wisotzki +3
We report on observations of redshifted HeII 304 A absorption in the QSO HE 2347-4342 (z=2.885, V=16.1) with the GHRS on board HST (FWHM=0.7 A). At the expected position of HeII 30…
astro-ph1997★ 5 cited
The local luminosity function of QSOs and Seyfert 1 nuclei
T. Koehler, D. Groote, D. Reimers +1
We present the analysis of a new flux-limited sample of bright quasars and Seyfert 1 galaxies in an effective area of 611 square deg, drawn from the Hamburg/ESO survey. We confirm…