SIMBAD references

2019ApJ...872...49F - Astrophys. J., 872, 49-49 (2019/February-2)

FUGIN: molecular gas in Spitzer bubble N4 – Possible evidence for a cloud-cloud collision as a trigger of massive star formations.

FUJITA S., TORII K., TACHIHARA K., ENOKIYA R., HAYASHI K., KUNO N., KOHNO M., YAMAGISHI M., NISHIMURA A., UMEMOTO T., MINAMIDANI T., MATSUO M., TSUDA Y., SANO H., TSUTSUMI D., OHAMA A., YOSHIIKE S., OKAWA K. and FUKUI Y.

Abstract (from CDS):

Herein, we present 12CO (J = 1-0) and 13CO (J = 1-0) emission-line observations via the FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45 m telescope (FUGIN) toward Spitzer bubble N4. We observed clouds at three discrete velocities: 16, 19, and 25 km s–1. Their masses were 0.1 x 104 M, 0.3 x 104 M, and 1.4 x 104 M, respectively. The distribution of the 25 km s–1 cloud likely traces the ring-like structure observed at mid-infrared wavelength. The 16 and 19 km s–1 clouds have not been recognized in previous observations of molecular lines. We could not find clear expanding motion of the molecular gas in N4. On the contrary, we found a bridge feature and a complementary distribution, which are discussed as observational signatures of a cloud-cloud collision (CCC), between the 16 and 25 km s–1 clouds. We proposed a possible scenario wherein the formation of a massive star in N4 was triggered by a collision between the two clouds. The timescale of collision is estimated to be 0.2-0.3 Myr, which is comparable to the estimated dynamical age of the H II region of ∼0.4 Myr. In N4W, a star-forming clump located west of N4, we observed molecular outflows from young stellar objects and the observational signature of a CCC. Thus, we also proposed a possible scenario in which massive- or intermediate-mass star formation was triggered via a CCC in N4W.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: bubbles - ISM: clouds - ISM: individual objects: N4 - ISM: molecules - radio lines: ISM - stars: formation

CDS comments: N4W is not in SIMBAD, neither are stars S1 and S2.

Simbad objects: 5

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2021.07.29-13:50:04

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