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Molecular clouds in the NGC 6334 and NGC 6357 region: Evidence for a 100 pc-scale cloud-cloud collision triggering the Galactic mini-starbursts

Tachihara, Kengo; Fukui, Yasuo; Sano, Hidetoshi +7 more

We carried out new CO (J = 1-0, 2-1, and 3-2) observations with NANTEN2 and ASTE in the region of the twin Galactic mini-starbursts NGC 6334 and NGC 6357. We detected two velocity molecular components of 12 km s^-1 velocity separation, which is continuous over 3° along the plane. In NGC 6334 the two components show similar two-peaked int…

Formation of the young compact cluster GM 24 triggered by a cloud-cloud collision

Tachihara, Kengo; Fukui, Yasuo; Sano, Hidetoshi +7 more

High-mass star formation is an important step which controls galactic evolution. GM 24 is a heavily obscured star cluster including a single O9 star with more than ∼100 lower-mass stars within a 0.3 pc radius toward (l, b) ∼ (350.5°, 0.96°), close to the Galactic mini-starburst NGC 6334. We found two velocity components associated with the cluster…

A high dust emissivity index β for a CO-faint galaxy in a filamentary Lyα nebula at z = 3.1

Hayes, Matthew; Kohno, Kotaro; Tanaka, Ichi +15 more

We present CO J = 4-3 line and 3 mm dust continuum observations of a 100 kpc-scale filamentary Lyα nebula (SSA22 LAB18) at z = 3.1 using the Atacama Large Millimeter/submillimeter Array (ALMA). We detected the CO J = 4-3 line at a systemic z_CO = 3.093 ± 0.001 at 11 σ from one of the ALMA continuum sources associated with the Lyα filamen…