| Title | A Mysterious Ring in Dark Space? |
| Authors | Zhang, Wei Yang, Fan Wu, Hong Wu, Chaojian Zou, Hu Zhang, Tianmeng Zhou, Xu Lei, Fengjie Jin, Junjie Zhou, Zhimin Nie, Jundan Ma, Jun Wang, Jiali |
| Affiliation | Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China |
| Keywords | PLANETARY-NEBULAE MILKY-WAY EMISSION GALAXY IRAS EXTINCTION EXPLORER CIRRUS CLOUD SYSTEM |
| Issue Date | Apr-2020 |
| Publisher | ASTROPHYSICAL JOURNAL |
| Abstract | 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) similar to 0.02 mag is estimated from Infrared Astronomical Satellite (IRAS) 100 mu m intensity and H i 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. |
| URI | http://hdl.handle.net/20.500.11897/588620 |
| ISSN | 0004-637X |
| DOI | 10.3847/1538-4357/ab7c5a |
| Indexed | SCI(E) Scopus |
| Appears in Collections: | 物理学院 |
