Revealing the structure of the Milky Way via parallax observations of maser sources
DAM Seminar (724, ICCUB building, UB Campus)
23/01/2020 - 00/00/0000
Edwin Hubble showed in 1926 that galaxies can be classified into three groups depending on their shape: ellipticals, spirals and irregulars. We know that our own Galaxy has a spiral shape. However, the details of the galactic structure like the number of spiral arms or their exact location are still under debate. In the first part of this talk, I will present recent efforts to unveil the structure of our Milky Way, a complicated endeavour due to our position in the Galaxy.

I will introduce the Bar and Spiral Structure Legacy (BeSSeL) survey and show how we used observations of maser sources in star-forming regions via the parallax method to pinpoint the Milky Way's spiral arms. I will also present some recent comparisons between BeSSeL and Gaia results. In the second part of the talk, I will focus on the Scutum spiral arm. With proper motion observations of maser sources we revealed a group of star-forming regions with large peculiar motions which are oriented towards the Galactic Centre. I will discuss our hypothesis that these motions are caused by the gravitational potential of the Galactic bar.
Attached Documents
Generalitat de CatalunyaUniversitat de BarcelonaUniversitat Autònoma de BarcelonaUniversitat Politècnica de CatalunyaConsejo Superior de Investigaciones CientíficasCentres de Recerca de Catalunya