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12
Marzo 2021

The physical and chemical structure of SgrB2. Studying the most massive cloud in the Galaxy


Inicio: 12:00h
Ponente: Álvaro Sánchez-Monge (University of Cologne)
Lugar: Zoom: https://us02web.zoom.us/j/85044910172?pwd=bXRmeWx3cTdDSzkrMFFJUXI5eE9hQT09 Meeting ID: 850 4491 0172 Passcode: 996691

The giant molecular cloud complex Sagittarius B2 (hereafter, SgrB2) is the most massive region with ongoing star formation in our Galaxy. It is located at a projected distance of only 100 pc along the plane to the Galactic Center and at 8.5 kpc from the Sun. The whole complex contains a total gas mass…
Inicio: 12:00h
Ponente: Álvaro Sánchez-Monge (University of Cologne)
Lugar: Zoom: https://us02web.zoom.us/j/85044910172?pwd=bXRmeWx3cTdDSzkrMFFJUXI5eE9hQT09 Meeting ID: 850 4491 0172 Passcode: 996691

The giant molecular cloud complex Sagittarius B2 (hereafter, SgrB2) is the most massive region with ongoing star formation in our Galaxy. It is located at a projected distance of only 100 pc along the plane to the Galactic Center and at 8.5 kpc from the Sun. The whole complex contains a total gas mass of 10^7 Msun, with the main sites of active star formation corresponding to the hot molecular cores SgrB2(N) and SgrB2(M), which are located at the center of the complex. They contain more than 50 high-mass stars with spectral types ranging from O5 to B0, and constitute one of the best laboratories for the search of new chemical species in the Universe.
In the last years, we have pursued a large project to characterize the structure of SgrB2 combining observations at different wavelengths and sensitive to all the scales (ranging from the large envelope that extends about 40 pc down to a few hundred AU), with 3D radiative transfer modelling. Some of the main results reveal (i) distributed (high-mass) star formation happening throughout the whole SgrB2 envelope and not only in the central hot molecular cores, (ii) extended HII regions, mixed with non-thermal radiation, likely shaping the structure of the envelope, (iii) clusters of hot molecular cores with a myriad of lines and different chemical and physical properties, and (iv) a converging filamentary structure that transports mass from the outside to the center of the most massive cores. I will present these and some other recent results in the seminar.
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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya