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Title: SiO emission as a probe of cloud–cloud collisions in infrared dark clouds
Authors: Cosentino, R.
Jiménez Serra, I.
Henshaw, J. D.
Caselli, P.
Viti, S.
Barnes, A. T.
Tan, T. C.
Fontani, F.
Wu, B.
Keywords: ISM: clouds;H II regions;ISM: individual objects: G018.82–00.28, G019.27+00.07, G028.53–00.25;G028.67+00.13, G038.95–00.47, G053.11+00.05;ISM: kinematics and dynamics;ISM: molecules
Issue Date: 25-Sep-2020
Publisher: Oxford Academics: Oxford University Press
DOI: 10.1093/mnras/staa2942
Published version:
Citation: Monthly Notices of the Royal Astronomical Society 499(2): 1666–1681(2020)
Abstract: Infrared dark clouds (IRDCs) are very dense and highly extincted regions that host the initial conditions of star and stellar cluster formation. It is crucial to study the kinematics and molecular content of IRDCs to test their formation mechanism and ultimately characterize these initial conditions. We have obtained high-sensitivity Silicon Monoxide, SiO(2–1), emission maps towards the six IRDCs, G018.82–00.28, G019.27+00.07, G028.53–00.25, G028.67+00.13, G038.95–00.47, and G053.11+00.05 (cloud A, B, D, E, I, and J, respectively), using the 30-m antenna at the Instituto de Radioastronomía Millimétrica (IRAM30m). We have investigated the SiO spatial distribution and kinematic structure across the six clouds to look for signatures of cloud–cloud collision events that may have formed the IRDCs and triggered star formation within them. Towards clouds A, B, D, I, and J, we detect spatially compact SiO emission with broad-line profiles that are spatially coincident with massive cores. Towards the IRDCs A and I, we report an additional SiO component that shows narrow-line profiles and that is widespread across quiescent regions. Finally, we do not detect any significant SiO emission towards cloud E. We suggest that the broad and compact SiO emission detected towards the clouds is likely associated with ongoing star formation activity within the IRDCs. However, the additional narrow and widespread SiO emission detected towards cloud A and I may have originated from the collision between the IRDCs and flows of molecular gas pushed towards the clouds by nearby H II regions.
Description: This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (
E-ISSN: 1365-2966
ISSN: 0035-8711
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