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4th of October 2018
Mopra observations of a mid-infrared bubble (by Kohno et al.)
Kohno et al. have performed a multi-wavelength study of the mid-infrared bubble GAL 334.53+00.83 to investigate the origin of isolated high-mass star and the star-formation process around the bubble formed by the H II region. They describe the results of CO observations toward this isolated galactic bubble using the NANTEN2, Mopra, and ASTE radio telescopes. They found two distinct velocity components in the direction of the bubble, at −84 km/s and −79 km/s, which are likely to be physically associated with the bubble. They hypothesize that the two clouds collided with each other 3 Myr ago, triggering the formation of the isolated high-mass star in GAL 334.53+00.83. They argue that this scenario can explain the origin of the isolated O-star inside the bubble. The figure above shows, at left, a map of the integrated 12CO J = 1–0 emission in the velocity range of −88.5 to −69.2 km/s, where the contours show the Spitzer/IRAC 8-µm result. At right is the Mopra map of integrated intensity of the 12CO J = 1–0 emission. The final beam size after convolution is 45′′. Full details are given in the paper, to appear in the Publications of the Astronomical Society of Japan.

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