Evidence for a cloud-cloud collision in Sh2-233 triggering the formation of the high-mass protostar object IRAS 05358+3543

Yamada R, Fukui Y, Sano H, Tachihara K, Bieging JH, Enokiya R, Nishimura A, Fujita S, Kohno M, Tsuge K (2022)


Publication Type: Journal article

Publication year: 2022

Journal

Book Volume: 515

Pages Range: 1012-1025

Journal Issue: 1

DOI: 10.1093/mnras/stac1087

Abstract

We have carried out a new kinematical analysis of the molecular gas in the Sh2-233 region by using the CO J = 2-1 data taken at similar to 0.5 pc resolution. The molecular gas consists of a filamentary cloud of 5-pc length with 1.5-pc width where two dense cloud cores are embedded. The filament lies between two clouds, which have a velocity difference of 2.7 km s(-1) and are extended over similar to 5 pc. We frame a scenario that the two clouds are colliding with each other and compressed the gas between them to form the filament in similar to 0.5 Myr which is perpendicular to the collision. It is likely that the collision formed not only the filamentary cloud but also the two dense cores. One of the dense cores is associated with the high-mass protostellar candidate IRAS 05358+3543, a representative high-mass protostar. In the monolithic collapse scheme of high mass star formation, a compact dense core of 100 M-circle dot within a volume of 0.1 pc radius is assumed as the initial condition, whereas the formation of such a core remained unexplained in the previous works. We argue that the proposed collision is a step which efficiently collects the gas of 100 M-circle dot into 0.1 pc radius. This lends support for that the cloud-cloud collision is an essential process in forming the compact high-mass dense core, IRAS 05358+3543.

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How to cite

APA:

Yamada, R., Fukui, Y., Sano, H., Tachihara, K., Bieging, J.H., Enokiya, R.,... Tsuge, K. (2022). Evidence for a cloud-cloud collision in Sh2-233 triggering the formation of the high-mass protostar object IRAS 05358+3543. Monthly Notices of the Royal Astronomical Society, 515(1), 1012-1025. https://dx.doi.org/10.1093/mnras/stac1087

MLA:

Yamada, Rin, et al. "Evidence for a cloud-cloud collision in Sh2-233 triggering the formation of the high-mass protostar object IRAS 05358+3543." Monthly Notices of the Royal Astronomical Society 515.1 (2022): 1012-1025.

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