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

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    Author
    Reiter, Megan
    Kiminki, Megan M.
    Smith, Nathan
    Bally, John
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-10
    Keywords
    stars: formation
    Herbig
    Haro objects
    ISM: jets and outflows
    ISM: kinematics and dynamics
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Proper motions of collimated jets from intermediate-mass protostars in the Carina Nebula 2017, 470 (4):4671 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
    Collection 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
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stx1489
    Version
    Final published version
    Sponsors
    NASA from Space Telescope Science Institute [AR-12155, GO-13390, GO-13391]; NASA [NAS 5-26555]
    Additional Links
    https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx1489
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stx1489
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