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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