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An Orphan No Longer? Detection of the Southern Orphan Stream and a Candidate Progenitor

机译:不再是孤儿?检测南部孤儿流和候选祖细胞

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摘要

Using a shallow, two-color survey carried out with the Dark Energy Camera, we detect the southern, possibly trailing arm of the Orphan Stream. The stream is reliably detected to a decl. of −38°, bringing the total known length of the Orphan Stream to 108°. We find a slight offset or "S" shape in the stream at δ ≃ −14° that would be consistent with the transition from leading to trailing arms. This coincides with a moderate concentration of 137 ± 25 stars (to g = 21.6) that we consider a possible remnant of the Orphan progenitor. The position of this feature is in agreement with previous predictions.
机译:使用暗能量相机进行的浅色,两色调查,我们检测到了孤儿溪流的南部(可能是拖尾)。可靠地检测到流。 -38°,使孤流的总已知长度达到108°。我们发现在δ14 -14°的水流中有轻微的偏移或“ S”形,这与从前臂到后臂的过渡一致。这与137±25星的中等浓度(g = 21.6)相吻合,我们认为这可能是孤儿祖先的残余。此功能的位置与以前的预测一致。

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