Events Calendar
Mapping the Milky Way in two and three dimensions
Friday October 9, 2020
| 3:30 pm
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Presenter: | Andreas Brunthaler Astronomer in the Millimeter & Submillimeter Astronomy Group at the Max-Planck-Institut für Radioastronomie |
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| Series: | Physics and Astronomy Colloquium | |
| Abstract: |
n my talk, I will present results from two recent large radio survey of
the Milky Way. The GLObal View on STAR formation (GLOSTAR) Survey is a C-Band (4-8 GHz) survey of 145 square degrees of the Northern Galactic Plane conducted with the Karl G. Jansky Very Large Array in multiple configurations and the Effelsberg 100-m telescope. We not only observed the radio continuum emission in full polarization, but also the 6.7 GHz methanol maser transition, the 4.8 GHz formaldehyde line, as well as several radio recombination lines. This provides for the first time a radio survey covering all angular scales down to 1.5 arcsec, similar to complementary NIR/MIR Galactic Plane surveys. This survey of the Galactic plane detects tell-tale tracers of star formation: compact, ultra- and hyper-compact Hii regions and molecular masers which trace different stages of early stellar evolution and pinpoints the very centers of the early phase of star-forming activity. The Bar and Spiral Structure (BeSSeL) Survey is measuring accurate distances and proper motions of high mass star forming regions across the Milky Way using the Very Long Baseline Array. The target sources are methanol and water masers that are associated with young massive stars and compact HII regions that trace spiral structure. With accurate distance measurements we locate the spiral arms, and with absolute proper motions we can determine the 3-dimensional motions of these massive young stars. Modeling the absolute proper motions gives very accurate measurements of fundamental Galactic parameters, such as the distance to the Galactic center (Ro), the rotation velocity at the Sun (Θo), and the rotation curve of the Milky Way. |
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| Web Site: | https:/ / www3.mpifr-bonn.mpg.de/ staff/ abrunthaler/ index.shtml | |
| Host: | Ylva Pihlström | |
| Location: | Zoom | |
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