A Constraint on the Gravitational Lensing Magnification and Age of the Redshift z=6.28 Quasar SDSS 1030+0524

Abstract

The recent discovery of bright quasars around redshift z=6 suggests that black holes (BHs) with masses in excess of 10^9 Msun have already assembled at a very early stage in the evolution of the universe. An alternative interpretation is that these quasars are powered by less massive BHs, but their fluxes are strongly magnified through gravitational lensing by intervening galaxies. Here we analyze the flux distribution of the Ly alpha emission of the quasar with the highest known redshift, SDSS 1030+0524, at z=6.28. We show that this object could not have been magnified by lensing by more than a factor of five. The constraint arises from the large observed size, 30 (comoving) Mpc, of the ionized region around this quasar, and relies crucially only on the assumption that the quasar is embedded in a largely neutral IGM. Based on the line/continuum ratio of SDSS 1030+0524, we argue further that this quasar also cannot be beamed by a significant factor. We conclude that the minimum mass for its resident BH is 4 x 10^8 Msun (for magnification by a factor of five); if the mass is this low, then the quasars had to switch on prior to redshift z=9. From the size of the ionized region, we are also able to place an absolute lower bound on the age of this quasar at t > 2 x 10^7 years.

Submitted to ApJL, 2 figures included

References in corpus (6)

• Observational constraints on growth of massive black holes
• Evolution of the Ionizing Background and the Epoch of Reionization from the Spectra of z~6 Quasars
• VLT observations of the z=6.28 quasar SDSS 1030+0524
• Gravitational lenses magnify up to one third of the most distant quasars
• Gravitational Lensing of the SDSS High-Redshift Quasars
• Constraining the Redshift z=6 Quasar Luminosity Function Using Gravitational Lensing

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