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- W3135203477 abstract "Abstract HH 211 is a highly collimated jet with a chain of knots and a wiggle structure on both sides of a young Class 0 protostar. We used two epochs of Atacama Large Millimeter/submillimeter Array (ALMA) data to study its inner jet in the CO( J = 3–2), SiO( J = 8–7), and SO( N J = 8 9 –7 8 ) lines at ∼25 au resolution. With these ALMA and previous 2008 Submillimeter Array data, the proper motion of 8 knots within ∼250 au of the central source is found to be ∼0068 per year (∼102 km s −1 ), consistent with previous measurements in the outer jet. At about four times higher resolution, the reflection-symmetric wiggle can be still fitted by a previously proposed orbiting jet source model. Previously detected continuous structures in the inner jet are now resolved, containing at least 5 subknots. These subknots are interpreted in terms of a variation in the ejection velocity of the jet with a period of ∼4.5 yr, shorter than that of the outer knots. In addition, backward and forward shocks are resolved in a fully formed knot, BK3, and signatures of internal working surface and sideways ejection are identified in position–velocity diagrams. In this knot, low-density SO and CO layers are surrounded by a high-density SiO layer." @default.
- W3135203477 created "2021-03-15" @default.
- W3135203477 creator A5030721212 @default.
- W3135203477 creator A5048172077 @default.
- W3135203477 date "2021-03-01" @default.
- W3135203477 modified "2023-10-18" @default.
- W3135203477 title "25 au Angular Resolution Observations of HH 211 with ALMA: Jet Properties and Shock Structures in SiO, CO, and SO" @default.
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- W3135203477 doi "https://doi.org/10.3847/1538-4357/abd6c5" @default.
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