TY - GEN
T1 - Tomography of Galactic star-forming regions and spiral arms with the Square Kilometre Array
AU - Loinard, L.
AU - Thompson, M.A.
AU - Hoare, M.
AU - van Langevelde, H.J.
AU - Ellingsen, S.
AU - Brunthaler, A.
AU - Forbrich, J.
AU - Rygl, K.
AU - Rodríguez, L.F.
AU - Mioduszewski, A.J.
AU - Torres-López, R.M.
AU - Dzib, S.A.
AU - Ortiz-León, G.N.
AU - Bourke, T.
AU - Green, J.A.
N1 - Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
UR - http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=215#session-2112
M3 - Conference contribution
T3 - Proceedings of Science
BT - Advancing Astrophysics with the Square Kilometre Array
T2 - Advancing Astrophysics with the Square Kilometre Array (AASKA14)
Y2 - 8 June 2014 through 13 June 2014
ER -