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• W2035591344 abstract "We present measurements of proper motions and radial velocities of four powerful Herbig-Haro (HH) jets in the Carina nebula: HH 666, HH 901, HH 902, and HH 1066. Two epochs of Hubble Space Telescope (HST) imaging separated by a time baseline of ~4.4 years provide proper motions that allow us to measure the transverse velocities of the jets, while ground-based spectra sample their Doppler velocities. Together these yield full three-dimensional space velocities. Aside from HH 666, their identification as outflows was previously inferred only from morphology in images. Proper motions now show decisively that these objects are indeed jets, and confirm that the intermediate-mass protostars identified as the candidate driving sources for HH 666 and HH 1066 are indeed the origin of these outflows. The appearance of two new knots in the HH 1066 jet suggest recent (~35 yr) changes in the accretion rate, underscoring the variable nature of accretion and outflow in the formation of intermediate-mass stars. In fact, kinematics and mass-ejection histories for all the jets suggest highly episodic mass loss, and point toward pronounced accretion fluctuations. Overall, we measure velocities similar to those found for low-mass protostars. However, the HH jets in Carina have higher densities and are more massive than their low-mass counterparts. Coarse estimates suggest that the heavy jets of intermediate-mass protostars can compete with or even exceed inject ~10 or more times the cumulative momentum injection of lower-mass protostars." @default.
• W2035591344 created "2016-06-24" @default.
• W2035591344 creator A5010166346 @default.
• W2035591344 creator A5018953214 @default.
• W2035591344 date "2014-10-31" @default.
• W2035591344 modified "2023-10-06" @default.
• W2035591344 title "Kinematics of powerful jets from intermediate-mass protostars in the Carina nebula" @default.
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• W2035591344 doi "https://doi.org/10.1093/mnras/stu1979" @default.
• W2035591344 hasPublicationYear "2014" @default.
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