The 3--53 keV spectrum of the quasar 1508+5714: X-rays from Z = 4.3

Details The 3--53 keV spectrum of the quasar 1508+5714: X-rays from Z = 4.3 The 3--53 keV spectrum of the quasar 1508+5714: X-rays from Z = 4.3

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.2304m&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #23.04; Bulletin of the American Astronomical Society, Vol. 28, p.855

Astronomy and Astrophysics

Astronomy

Scientific paper

Three of 20 radio-selected X-ray sources from our reanalysis of the Einstein IPC database proved to be quasars with redshifts in excess of 3. The most distant example, 1508+5714 at z = 4.30, is presently the most luminous and highest flux X-ray quasar known with z > 3.4. We have obtained the X-ray spectrum of 1508+5714 with the ASCA Observatory in the 0.5--10 keV band, which corresponds to the 3--53 keV range in the quasar rest frame. The X-ray properties of quasars are potentially sensitive indicators of their evolution, but to date fewer than 25 high-redshift (z > 3) X-ray quasars have been detected at X-ray wavelengths. Thus, each new example represents a valuable resource for quasar evolution studies. We describe the spectral properties of 1508+5714 in this context, and our current efforts to identify more of these rare objects.

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