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What: |
″BeSSeL″ VLBI maser astrometry project: Exploration of the Galactic Bar and Spiral Structure |
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Who: |
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(Astronomy Department, Nanjing University) |
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When: |
Thursday afternoon, May 20th, 3:30 p.m |
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Where: |
Room 327, Office Block, 2 West Beijing Road (PMO, CAS) |
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Welcome to attend |
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( PMO Academic committee & academic circulating committee) |
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abstract
One of the frontier objects in all of astrophysics is what pattern the Galactic bar and spiral structure look like. With the evidence found at optical, radio，infrared and x-ray wavelengths our Galaxy is a barred spiral galaxy by general consensus. However, some essentials, such as the actual number and the shape of the spiral arm, the size and the inclination of the bar, are still under open. A international team with Chinese astronomers proposed the BeSSeL project to survey the Galactic bar and spiral structure. The project will take about 5-7 year to observe more then 500 maser sources associated the massive star forming region in the bar and the spiral of the Milky Way and mesure their trigonomatric parallax using the VLBA, the largest radio interferomer arry in the world. Accurate measurements of distances and 3-dimention velocities of these maser sources in the bar and spiral ams will comprehensively investigate the bar and spiral structore of the Milky Way. The BeSSeL project may make a breakthrough in understanding of the Milky Way and a impact of the knowledge about the galactic structure, formation, evolution as well as the universe.
