Physical properties of molecular clouds as revealed by NANTEN CO survey: from the galactic center to the galactic warp

Astronomy and Astrophysics – Astrophysics

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Scientific paper

We have been carrying out a CO J=1rightarrow 0 large-scale survey of molecular gas along the galactic plane with NANTEN radio telescope at Las Campanas observatory, Chile since 1996. More than 1,100,000 spectra have been obtained at a 4 arcmin grid spacing for |b| ≤ 5° and at a 8 arcmin grid spacing for 10° > |b| > 5°, respectively. In addition to having obtained a considerably improved dataset for the CO clouds in the galactic disk, we have revealed new features outside the disk including molecular supershells, some peculiar off-plane structures in the galactic center region, and distant molecular clouds located in the galactic warp. I will briefly review some of the notable topics of the NANTEN CO galactic plane survey.

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