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Title: Molecular outflows in starburst nuclei
Authors: Roy, Arpita
Nath, Biman B.
Sharma, Prateek
Shchekinov, Yuri
Keywords: Bubbles Molecules
Issue Date: Dec-2016
Publisher: Oxford University Press for the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2016, Vol. 463, p2296-2309
Abstract: Recent observations have detected molecular outflows in a few nearby starburst nuclei. We discuss the physical processes at work in such an environment in order to outline a scenario that can explain the observed parameters of the phenomenon, such as the molecular mass, speed and size of the outflows. We show that outflows triggered by OB associations, with NOB ≥ 105 (corresponding to a star formation rate (SFR)≥1 M⊙ yr−1 in the nuclear region), in a stratified disc with mid-plane density n0 ∼ 200–1000 cm−3 and scaleheight z0 ≥ 200(n0/102 cm−3)−3/5 pc, can form molecules in a cool dense and expanding shell. The associated molecular mass is ≥107 M⊙ at a distance of a few hundred pc, with a speed of several tens of km s−1. We show that an SFR surface density of 10 ≤ ΣSFR ≤ 50 M⊙ yr−1 kpc−2 favours the production of molecular outflows, consistent with observed values.
Description: Open Access
ISSN: 0035-8711
1365-2966 - (online)
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Copyright: 2016 The authors & the Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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