Proper motions of collimated jets from intermediate-mass protostars in the Carina Nebula
Name:
Reiter_et_al_Proper_Motions_of ...
Size:
11.73Mb
Format:
PDF
Description:
FInal Published Version
Publisher
OXFORD UNIV PRESSCitation
Proper motions of collimated jets from intermediate-mass protostars in the Carina Nebula 2017, 470 (4):4671 Monthly Notices of the Royal Astronomical SocietyRights
© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical SocietyCollection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.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 similar to 10 yr apart with Hubble Space Telescope/Advanced Camera for Surveys (ACS). Transverse velocities in all but one jet are faster than greater than or similar to 25 km s(-1), confirming that the jet-like H alpha features identified in the first epoch images 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 similar to 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 similar to 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 similar to 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.ISSN
0035-87111365-2966
Version
Final published versionSponsors
NASA from Space Telescope Science Institute [AR-12155, GO-13390, GO-13391]; NASA [NAS 5-26555]ae974a485f413a2113503eed53cd6c53
10.1093/mnras/stx1489