Intrinsically Polarized Stars and Implication for Star Formation in the Central Parsec of Our Galaxy
Intrinsically Polarized Stars and Implication for Star Formation in the Central Parsec of Our Galaxy
复制标题
本质偏振恒星及其对银河系中央秒差距恒星形成的影响
DOI：
10.1088/0004-637x/778/2/92
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
et al.
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作者：
Tatsuhito Yoshikawa;et al.
我们在斯巴鲁望远镜上进行了自适应光学辅助观测，在银河系中央秒差距处发现了11个固有偏振源。它们是从KS < 15.5的318个点源中选出的，用Stokes Q/I-U/I图对它们的星际偏振进行了校正。考虑到亮度，近红外色过剩，和量的内禀偏振，其中两个是很好的年轻恒星对象（YSO）的候选人，年龄为10.5岁。如果它们是真正的YSO，它们的存在对该区域的星星形成机制提供了强有力的约束。在其余的源中，有两个是已知的位于北方旋臂中的弓形激波源，另一个也位于北方旋臂中，并且显示出非常相似的性质，因此它很可能是一个迄今未知的弓形激波源。其他来源的内在极化的起源还不确定。
We have carried out adaptive-optics assisted observations at the Subaru Telescope and have found 11 intrinsically polarized sources in the central parsec of our Galaxy. They are selected from 318 point sources with K S< 15.5, and their interstellar polarizations are corrected using a Stokes Q/I–U/I diagram. Considering brightness, near-infrared color excess, and the amount of intrinsic polarization, two of them are good young stellar object (YSO) candidates with an age of∼ 10 5 yr. If they are genuine YSOs, their existence provides strong constraints on star formation mechanisms in this region. In the remaining sources, two are known as bow-shock sources in the Northern Arm. One other is also located in the Northern Arm and shows very similar properties, and thus it is likely to be a so far unknown bow-shock source. The origin of the intrinsic polarization of the other sources is as yet uncertain.