GB 1508+5714, The First z>4 Radio-Selected Quasar in X-Rays

Details GB 1508+5714, The First z>4 Radio-Selected Quasar in X-Rays GB 1508+5714, The First z>4 Radio-Selected Quasar in X-Rays

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1551m&link_type=abstract

Astronomical Journal v.110, p.1551

Astronomy and Astrophysics

Astronomy

12

Quasars: Individual: Gb 1508, X-Rays: Galaxies, Early Universe

Scientific paper

We report the detection in x ray of a high redshift (z = 4.30) radio-loud quasar, GB 1508+5714, the first radio-selected z > 4 quasar seen in x- rays. The quasar was observed serendipitously with the Einstein observatory IPC at 0.02 +/- 0.003 counts s^-1^. It is ten times brighter than the other two z > 4 x-ray detected quasars. The x-ray source is unusually hard, implying either α_E_ < -0.2, or N_H_> 10^22^ atoms cm^-2^ (1σ limits) for a simple power-law plus intrinsic (z = 4.3) absorption. Intrinsic absorption would make GB 1508+5714 similar to a large fraction of z ~ 3 radio-loud quasars.

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