Using new R-band images acquired as part of the 3CR Snapshot Survey with the Wide Field Planetary Camera 2 on the Hubble Space Telescope, we present positive optical identifications of three previously unidentified 3C radio sources (3C 91, 134, and 141). The fields of five others (3C 131, 152, 399.1, 415.2, and 468.1) are also presented with tentative identifications for some. The fields of two other sources (3C 249 and 3C 250) are empty. Eight sources lie along the Galactic plane (|b| 10°) and are consequently heavily obscured, while the two empty fields are located at higher Galactic latitudes. Observed and corrected R magnitudes of each candidate are calculated. Confirmation of the true optical counterpart will require deep near-IR imaging and long-slit spectroscopy to determine the nature and redshift of the counterparts and candidates.
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机译：使用在哈勃太空望远镜上通过广角行星相机2在3CR快照调查中获取的新R波段图像，我们给出了三个先前未识别的3C无线电源（3C 91、134和141）的正光学识别。还为其他五个字段（3C 131、152、399.1、415.2和468.1）提供了临时标识。其他两个来源（3C 249和3C 250）的字段为空。八个源位于银河平面（| b | <10°）上，因此被严重遮挡，而两个空场位于较高的银河纬度上。计算每个候选者的观察和校正后的R幅度。确认真正的光学对等物需要深的近红外成像和长缝光谱法，以确定对等物和候选物的性质和红移。
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