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X-ray luminous radio-quiet high redshift QSOs in the ROSAT All-Sky Survey

Xue-Bing Wu·Norbert Bade·Volker Beckmann
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Abstract

X-ray luminous radio-quiet high redshift QSOs are rare and can be used for the investigation of several important astronomical questions. We have conducted a large area survey for radio-quiet high redshift QSOs in the ROSAT All-Sky Survey, from which QSO candidates are selected using the digitized objective prism spectra from the Hamburg Quasar Survey. The 22 candidates with Galactic latitudes larger than $35^o$ were observed with the 2.16m telescope at Xinglong station of Beijing Astronomical Observatory. Among the 19 new QSOs in our sample, six are radio-quiet QSOs with redshifts larger than 1.3 and three of them have redshifts larger than 2. Thus we have doubled the number of known X-ray luminous, radio-quiet high redshift QSOs in the surveyed sky area. The distribution of $f_{1.4GHz}/f_{1keV}$ of radio-loud and radio-quiet QSOs in this area shows two well separated peaks. This can be taken as an evidence for different emission mechanisms of the observed X-rays in the two subgroups.

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Xue-Bing Wu, Norbert Bade, Volker Beckmann. 1999-04-19. X-ray luminous radio-quiet high redshift QSOs in the ROSAT All-Sky Survey. https://arxiv.org/abs/astro-ph/9904233

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