The ASCA spectrum of the z=4.72 blazar, GB 1428+4217

Details The ASCA spectrum of the z=4.72 blazar, GB 1428+4217 The ASCA spectrum of the z=4.72 blazar, GB 1428+4217

1998-01-28

arxiv.org/abs/astro-ph/9801288v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 Postscript figures, to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.2951148

The X-ray luminous quasar GB 1428+4217 at redshift 4.72 has been observed with ASCA. The observed 0.5-10 keV flux is 3.2E-12 erg/s/cm2. We report here on the intrinsic 4-57 keV X-ray spectrum, which is very flat (photon index of 1.29). We find no evidence for flux variability within the ASCA dataset or between it and ROSAT data. We show that the overall spectral energy distribution of GB 1428+4217 is similar to that of lower redshift MeV blazars and present models which fit the available data. The Doppler beaming factor is likely to be at least 8. We speculate on the number density of such high redshift blazars, which must contain rapidly-formed massive black holes.

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