暗空间的神秘戒指？
A Mysterious Ring in Dark Space?
摘要：
我们报道了在北京-亚利桑那巡天（BASS）中发现的一个低表面亮度（g波段27.42 mag arcsec^（-2））的环状星云。在从远紫外到远红外的多波段数据中，除了来自BASS的z波段和来自宽视场红外巡天探测器的W1，W2外，都发现了正检测。根据红外天文卫星（IRAS）100微米强度和HI柱密度估算了E（B-V）~ 0.02等星云的红化.在Pan-STARRS 1、2微米全天巡天和盖亚的3D变红图的帮助下，得出了距离地球约500 pc的星云。这样一个低表面亮度的星云，其能量可以通过漫射的银河光来解释，可以解释红外卷云的光学对应物，红外卷云在30多年前被IRAS探测到。环状结构可能是行星状星云演化的最终阶段，而中央的白矮星恒星由于不明原因被从星云中弹出。另一方面，环状结构是两个紧密细丝的叠加，这可能是另一个合理的解释。考虑到光谱数据的缺乏和距离测量的不确定性，这些解释需要通过未来的观测进行检查。
英文摘要：
We report the discovery of a low-surface-brightness (27.42 mag arcsec^(-2) in g band) nebula, which has a ring-like shape in the Beijing-Arizona Sky Survey (BASS). Positive detections have been found in multiband data from far ultraviolet to far infrared, except the z band from BASS and W1, W2 from the Wide-field Infrared Survey Explorer. The reddening of the nebula E(B - V) ~ 0.02 mag is estimated from Infrared Astronomical Satellite (IRAS) 100 micron intensity and HI column density. With the help of the 3D reddening map from Pan-STARRS 1, the Two Micron All Sky Survey, and Gaia, the distance to the nebula of about 500 pc from Earth is derived. Such a low-surface-brightness nebula whose energy can be interpreted by the diffuse Galactic light could account for the optical counterpart of the infrared cirrus, which was detected by IRAS more than 30 yr ago. The ring-like structure might be the ultimate phase of an evolved planetary nebula, while the central white dwarf star has been ejected from the nebula for an unclear reason. On the other hand, the ring structure being a superposition of two close filaments might be another reasonable explanation. Considering the lack of spectroscopic data and uncertainty in the distance measurement, these interpretations need to be checked by future observations.
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