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FNWI --- IMAPP Department of Astrophysics
Radboud University > Faculty of Science > Department of Astrophysics

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news:tracing_the_structure_and_kinematics_of_the_milky_way_through_astrometric_vlbi_measurements [2015/05/17 21:37] (current)
ekoerding created
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 +=== TRACING THE STRUCTURE AND KINEMATICS OF THE MILKY WAY THROUGH ASTROMETRIC VLBI MEASUREMENTS. ===
 +I will review the current state of the Bar and Spiral Structure Legacy Survey (BeSSeL).
 +The BeSSeL Survey is a Very Long Baseline Array (VLBA) key science project to measure
 +trigonometric parallaxes and proper motions of massive star-forming regions throughout
 +the 1st, 2nd, and in the 3rd Galactic quadrant of the Milky Way. Sites of star formation which
 +give birth to massive O-B stars trace rich gas condensations along spiral arm segments, and are
 +therefore the most suitable targets to pinpoint the spiral structure of our Galaxy. Very Long
 +Baseline Interferometry (VLBI) observations of strong maser emission, associated with young
 +massive stars, currently yield parallax accuracy as good as 10 micro-arcsecond. That allows us
 +to explore our Galaxy reaching objects with distances more than 10 kpc away from the Sun, and
 +still locating them with an accuracy better than 10%. Currently, over 100 trigonometric parallaxes
 +and proper motions have been measured with the VLBA, the European VLBI Network, and the Japanese
 +VLBI Exploration of Radio Astrometry facility. I will summarize the major achievements obtained
 +so far and put them in the context of a global view of our own Galaxy.