Observations of the high-redshift quasar Q1745+624 (z=3.9) with ASCA

Details Observations of the high-redshift quasar Q1745+624 (z=3.9) with ASCA Observations of the high-redshift quasar Q1745+624 (z=3.9) with ASCA

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.287..328k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 287, Issue 2, pp. 328-332.

Astronomy and Astrophysics

Astronomy

8

Quasars: Individual: Q1745+624, X-Rays: Galaxies

Scientific paper

Q1745+624 is located at redshift z=3.89, and is one of the most distant quasars observed in the X-ray band. Q1745+624 was clearly detected with ASCA in the 0.5-7keV X-ray band, or in 2.4-34keV in the quasar rest frame. If the energy spectrum is fitted by a single power law with photoelectric absorption, the photon index becomes 1.68^+0.25_-0.24, and the column density N_H becomes 2.1^+1.5_-1.4x10^21cm^-2, assuming the absorber to be located at z=0. This index is steeper than that of the cosmic X-ray background. The spectrum suggests the presence of excess absorption above the Galactic column. If the absorber is at the same redshift as the quasar, then the intrinsic column density N_H is inferred to be 6.1^+10.8_-5.9x10^22cm^-2, which is comparable to that seen in nearby Seyfert 2 galaxies. The spectrum shows neither flattening above ~10keV in the rest frame nor a significant Fe K line. This is in contrast to the X-ray properties of nearby Seyfert galaxies. When compared to lower redshift radio-loud quasars, Q1745+624 is inferred to have ~10 times higher luminosity, but a very similar X-ray spectral index as well as a similar spectral energy distribution from the radio to the X-ray bands.

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