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


Loinard, L and Thompson, M and Hoare, M and Jan van Langevelde, H and Ellingsen, S and Brunthaler, A and Forbrich, J and Rygl, KLJ and Rodriguez, LF and Mioduszewski, AJ and Torres-Lopez, RM and Dzib, SA and Ortiz-Leon, GN and Bourke, TL and Green, JA, Tomography of Galactic star-forming regions and spiral arms with the Square Kilometre Array, Advancing Astrophysics with the Square Kilometre Array, 9-13 June 2014, Giardini Naxos, Italy, pp. 163-170. ISBN 978-1-909204-70-6 (2015) [Refereed Conference Paper]



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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 regionsí 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.

Item Details

Item Type:Refereed Conference Paper
Keywords:star formation, VLBI
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Ellingsen, S (Professor Simon Ellingsen)
ID Code:102553
Year Published:2015
Deposited By:Mathematics and Physics
Deposited On:2015-08-28
Last Modified:2017-11-03
Downloads:233 View Download Statistics

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