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        Tomography of Galactic star-forming regions and spiral arms with the Square Kilometer Array

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        Author
        Loinard, Laurent
        Thompson, Mark
        Hoare, Melvin
        Langevelde, Huib Jan van
        Ellingsen, Simon
        Brunthaler, Andreas
        Forbrich, Jan
        Rygl, Kazi L. J.
        Rodriguez, Luis F.
        Mioduszewski, Amy J.
        Torres-Lopez, Rosa M.
        Dzib, Sergio A.
        Ortiz-Leon, Gisela N.
        Bourke, Tyler L.
        Green, James A.
        Attention
        2299/19436
        Abstract
        Very Long Baseline Interferometry (VLBI) at radio wavelengths can provide astrometry accurate to 10 micro-arcseconds or better (i.e. better than the target GAIA accuracy) without being limited by dust obscuration. This means that unlike GAIA, VLBI can be applied to star-forming regions independently of their internal and line-of-sight extinction. Low-mass young stellar objects (particularly T Tauri stars) are often non-thermal compact radio emitters, ideal for astrometric VLBI radio continuum experiments. Existing observations for nearby regions (e.g. Taurus, Ophiuchus, or Orion) demonstrate that VLBI astrometry of such active T Tauri stars enables the reconstruction of both the regions' 3D structure (through parallax measurements) and their internal kinematics (through proper motions, combined with radial velocities). The extraordinary sensitivity of the SKA telescope will enable similar "tomographic mappings" to be extended to regions located several kpc from Earth, in particular to nearby spiral arm segments. This will have important implications for Galactic science, galactic dynamics and spiral structure theories.
        Publication date
        2014-12-19
        Published in
        Advancing Astrophysics with the Square Kilometre Array
        Other links
        http://hdl.handle.net/2299/19436
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