Abstract
Abstract We have obtained deep images in the BVRIJHKs bands of the field centered on QSO 1508$+$5714 ($z_{\rm em}$$=$ 4.28) with the Suprime-Cam, FOCAS, and MOIRCS cameras on Subaru telescope. We report here on the detection of a $B$-dropout galaxy, which is 3${\rlap{\hskip.75pt{^{\prime\prime}}}\hskip.75pt.\hskip1.75pt}$5 north-west of the QSO sightline. A photometric redshift analysis is presented to complement the color selection. Given the photometric properties of this object ($M$$=$$-$22.2, making $L$$\approx$ 3$ L^{\ast}$, if placed at its photometric redshift, $z$$\sim$ 3.5), as well as the Sérsic index ($n$$\sim$ 1) derived from a 2-D imaging decomposition of the HST WFPC2 image taken with the $I_{\mathit{F814}}$ filter, the identified system is consistent with a massive disk galaxy at $z > $ 3. If confirmed, it would be one of the most distant massive disk galaxies known so far.
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