| 摘 要： | We have obtained deep J and Ks-band images centered on a bright radio quiet QSO UM 402(zem= 2.856) using the IRCS camera and adaptive optics systems that are part of the Subaru Telescope, as well as retrieved WFC3/F140 W archive images of this object. A faint galaxy(mk= 23.32 ± 0.05 in the Vega magnitude system)that lies ～ 2.4′′north of the QSO sightline has been clearly resolved in all three deep high resolution datasets, and appears as an irregular galaxy with two close components in the Ks-band images(separation ～ 0.3′′). Given the small impact parameter(b = 19.6 kpc, at zlls= 2.531), as well as the red color of(J- K s)Vega～ 1.6,it might be a candidate galaxy giving rise to the Lyman Limit system absorption at zabs= 2.531 seen in the QSO spectrum. After carefully subtracting the point spread function from the QSO images, the host galaxy of this bright radio quiet QSO at z ～ 3was marginally revealed. We placed a lower limit on the host component of mk～ 23.3according to our analyses.
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