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Tokuda, Kazuki; Fukui, Yasuo; Harada, Ryohei; Saigo, Kazuya; Tachihara, Kengo; Tsuge, Kisetsu; Inoue, Tsuyoshi; Torii, Kazufumi; Nishimura, Atsushi; Zahorecz, Sarolta; Nayak, Omnarayani; Meixner, Margaret; Minamidani, Tetsuhiro; Kawamura, Akiko; Mizuno, Norikazu; Indebetouw, Remy; Sewi o, Marta; Madden, Suzanne; Galametz, Maud; Lebouteiller, Vianney; Chen, C.-H. Rosie; Onishi, Toshikazu
Astrophysical journal/The Astrophysical journal, 11/2019, Volume: 886, Issue: 1Journal Article
We have conducted ALMA CO isotopes and 1.3 mm continuum observations toward filamentary molecular clouds of the N159W-South region in the Large Magellanic Cloud with an angular resolution of ∼0 25 (∼0.07 pc). Although the previous lower-resolution (∼1″) ALMA observations revealed that there is a high-mass protostellar object at an intersection of two line-shaped filaments in 13CO with the length scale of ∼10 pc, the spatially resolved observations, in particular, toward the highest column density part traced by the 1.3 mm continuum emission, the N159W-South clump, show complicated hub-filamentary structures. We also discovered that there are multiple protostellar sources with bipolar outflows along the massive filament. The redshifted/blueshifted components of the 13CO emission around the massive filaments/protostars have complementary distributions, which is considered to be possible evidence for a cloud-cloud collision. We propose a new scenario in which the supersonically colliding gas flow triggers the formation of both the massive filament and protostars. This is a modification of the earlier scenario of cloud-cloud collision, by Fukui et al., that postulated the two filamentary clouds occur prior to the high-mass star formation. A recent theoretical study of the shock compression in colliding molecular flows by Inoue et al. demonstrates that the formation of filaments with hub structure is a usual outcome of the collision, lending support for the present scenario. The theory argues that the filaments are formed as dense parts in a shock compressed sheet-like layer, which resembles "an umbrella with pokes."
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