English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present proper motion measurements of 37 jets and HH objects in the CarinaNebula measured in two epochs of H$\alpha$ images obtained $\sim 10$ yrs apartwith HST/ACS. Transverse velocities in all but one jet are faster than $\gtrsim25$ km s$^{-1}$, confirming that the jet-like H$\alpha$ features identified bySmith et al. (2010) trace outflowing gas. Proper motions constrain the locationof the jet-driving source and provide kinematic confirmation of theintermediate-mass protostars that we identify for 20/37 jets. Jet velocities donot correlate with the estimated protostar mass and embedded driving sources donot have slower jets. Instead, transverse velocities (median $\sim 75$ kms$^{-1}$) are similar to those in jets from low-mass stars. Assuming a constantvelocity since launch, we compute jet dynamical ages (median $\sim 10^4$ yr).If continuous emission from inner jets traces the duration of the most recentaccretion bursts, then these episodes are sustained longer (median $\sim 700$yr) than the typical decay time of an FU Orionis outburst. These jets can carryappreciable momentum that may be injected into the surrounding environment. Theresulting outflow force, $dP/dt$, lies between that measured in low- andhigh-mass sources, despite the very different observational tracers used.Smooth scaling of the outflow force argues for a common physical processunderlying outflows from protostars of all masses. This latest kinematic resultadds to a growing body of evidence that intermediate-mass star formationproceeds like a scaled-up version of the formation of low-mass stars.

Proper motions of collimated jets from intermediate-mass protostars in the Carina Nebula