Are Two z~6 Quasars Gravitationally Lensed ?

Abstract

Several high-z (z > 5.7) quasars have been found in the course of Sloan Digital Sky Survey. The presence of such very high-z quasars is expected to give constraints on early structure formation. On one hand, it is suggested that these most luminous objects at high redshift are biased toward the highly magnified objects by gravitational lensing. To clarify the effect of gravitational lensing on the high-z quasars, we began the imaging survey of intervening lensing galaxies. Indeed our previous optical image showed that SDSSp J104433.04+012502.2 at z=5.74 is gravitationally magnified by a factor 2. In this paper, we report our new optical imaging of other two high-z quasars, SDSSp J103027.10+052455.0 at z=6.28 and SDSSp J130608.26+035626.3 at z=5.99. Since we find neither intervening galaxy nor counter image with i^{\prime} < 25.4-25.8 around each quasar, we conclude that they are not strongly magnified regardless that a lens galaxy is dusty.

10 pages, 8 figures, Accepted for PASJ

References in corpus (5)

• A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey II: Discovery of Three Additional Quasars at z>6
• Subaru Prime Focus Camera -- Suprime-Cam --
• The Discovery of Two Lyman$\alpha$ Emitters Beyond Redshift 6 in the Subaru Deep Field
• The Virgo High-Resolution CO Survey I. CO Atlas
• SDSSp J104433.04$-$012502.2 at $z=5.74$ is Gravitationally Magnified by an Intervening Galaxy

Cited by in corpus (4)

• The Subaru Deep Field Project: Lyman$\alpha$ Emitters at Redshift of 6.6
• Imaging of SDSS z>6 quasar fields: gravitational lensing, companion galaxies and the host dark matter halos
• A Snapshot Survey for Gravitational Lenses Among z>=4.0 Quasars: I. The z>5.7 Sample
• High-resolution radio imaging of the most distant radio quasar SDSS J0836+0054