Speaker
Description
CHIMPS2 is the follow-up to the $^{13}\mathrm{CO}$/$\mathrm{C}^{18}\mathrm{O}$(J = 3→ 2) Heterodyne Inner Milky Way Plane Survey (CHIMPS) and the CO High-Resolution Survey(COHRS) and is a Large Program on the JCMT. The CHIMPS2 Inner Galaxy observations cover longitudes between 13° and 47° with $-0.5^\circ \leq b \leq 0.5^\circ$. When combined with the complementary $^{13}\mathrm{CO}$/$\mathrm{C}^{18}\mathrm{O}$/$^{12}\mathrm{CO}$ survey at the Nobeyama 45m at matching 15 arcsec resolution and sensitivity, and other current CO surveys, CHIMPS2 provides a complete set of transition data with which to calculate accurate column densities, gas temperatures and turbulent Mach numbers, that would otherwise rely on estimations and underlying assumptions.
We present the first comprehensive catalogue of molecular clouds traced in $^{13}\mathrm{CO}$(J = 3→ 2) across the Inner Galactic Plane, together with their denser substructures (clumps and cores), identified from the final CHIMPS2 data release using the SCIMES algorithm. This graph-based segmentation yields a sample of 5,241 molecular clouds and 17,328 dense substructures, corresponding to the leaves of the emission dendrogram.
Using derived column density and excitation temperature maps, we calculate key geometric and physical properties for each structure, including equivalent radii, masses, velocity dispersions, number densities, crossing time, free-fall time, thermal and turbulent pressure, mean excitation temperature and Mach number.
The wide Galactic longitude coverage of CHIMPS2 allows us to investigate how the properties of dense substructures - including independently estimated star formation efficiency - relate to those of their parent clouds across a range of Galactic environments, from the Galactic bar to the outer disk.
| Participate the oral/poster presentation award competition | Yes |
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