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A cloud-cloud collision in Sgr B2? 3D simulations meet SiO observations

Published online by Cambridge University Press:  20 January 2023

Wladimir E. Banda-Barragán Open the ORCID record for Wladimir E. Banda-Barragán [Opens in a new window] ,
Jairo Armijos-Abendaño  and
Helga Dénes
Wladimir E. Banda-Barragán
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany email: wbanda@hs.uni-hamburg.de
Jairo Armijos-Abendaño
Affiliation:
Observatorio Astronómico de Quito, Escuela Politécnica Nacional, Interior del Parque La Alameda, 170136, Quito, Ecuador
Helga Dénes
Affiliation:
ASTRON - The Netherlands Institute for Radio Astronomy, NL-7991 PD Dwingeloo, The Netherlands
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Abstract

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We compare the properties of shocked gas in Sgr B2 with maps obtained from 3D simulations of a collision between two fractal clouds. In agreement with 13CO(1-0) observations, our simulations show that a cloud-cloud collision produces a region with a highly turbulent density substructure with an average . Similarly, our numerical multi-channel shock study shows that colliding clouds are efficient at producing internal shocks with velocities of 5 − 50 km s−1 and Mach numbers of ∼ 4 − 40, which are needed to explain the ∼ 10−9 SiO abundances inferred from our SiO(2-1) IRAM observations of Sgr B2. Overall, we find that both the density structure and the shocked gas morphology in Sgr B2 are consistent with a Myr-old cloud-cloud collision. High-velocity shocks are produced during the early stages of the collision and can ignite star formation, while moderate- and low-velocity shocks are important over longer time-scales and can explain the extended SiO emission in Sgr B2.

Keywords

hydrodynamicsradio lines: ISMGalaxy: centreISM: clouds
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S362: The Predictive Power of Computational Astrophysics as a Discovery Tool , June 2020 , pp. 250 - 257
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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