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26 April 2024 |
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Proper motions of collimated jets from intermediate-mass protostars in the Carina Nebula | | Megan Reiter
; Megan M. Kiminki
; Nathan Smith
; John Bally
; | | Date: |
14 Jun 2017 | | Abstract: | We present proper motion measurements of 37 jets and HH objects in the Carina
Nebula measured in two epochs of H$alpha$ images obtained $sim 10$ yrs apart
with HST/ACS. Transverse velocities in all but one jet are faster than $gtrsim
25$ km s$^{-1}$, confirming that the jet-like H$alpha$ features identified by
Smith et al. (2010) trace outflowing gas. Proper motions constrain the location
of the jet-driving source and provide kinematic confirmation of the
intermediate-mass protostars that we identify for 20/37 jets. Jet velocities do
not correlate with the estimated protostar mass and embedded driving sources do
not have slower jets. Instead, transverse velocities (median $sim 75$ km
s$^{-1}$) are similar to those in jets from low-mass stars. Assuming a constant
velocity since launch, we compute jet dynamical ages (median $sim 10^4$ yr).
If continuous emission from inner jets traces the duration of the most recent
accretion bursts, then these episodes are sustained longer (median $sim 700$
yr) than the typical decay time of an FU Orionis outburst. These jets can carry
appreciable momentum that may be injected into the surrounding environment. The
resulting outflow force, $dP/dt$, lies between that measured in low- and
high-mass sources, despite the very different observational tracers used.
Smooth scaling of the outflow force argues for a common physical process
underlying outflows from protostars of all masses. This latest kinematic result
adds to a growing body of evidence that intermediate-mass star formation
proceeds like a scaled-up version of the formation of low-mass stars. | | Source: | arXiv, 1706.4657 | | Services: | Forum | Review | PDF | Favorites | |
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