Nobeyama Cygnus-X Survey: Physical Properties of C${}^{18}$O clumps in DR-6(W), DR-9 and DR-13S regions

Abstract

Cygnus-X is considered a region of interest for high-energy astrophysics, since the Cygnus OB2 association has been confirmed as a PeVatron in the Cygnus cocoon. In this research note, we present new high-resolution (16'') ${}^{12,13}$CO(J=1$\to$0) and C${}^{18}$O (J=1$\to$0) observations obtained with the Nobeyama 45-m radiotelescope, to complement the Nobeyama Cygnus-X Survey. We discovered 19 new C${}^{18}$O clumps associated with the star-forming regions DR-6W, DR-9, and DR13S. We present the physical parameters of these clumps, which are consistent with the neighboring covered regions. We confirm the clumpy nature of these regions and of a filament located between DR6 and DR6W. These results strongly suggest that star formation occurs in these regions with clumps of sizes $\sim$10${}^{-1}$ pc, masses $\sim$10${}^2$ M${}_{\odot }$, and H${}_2$ densities of $\sim$10${}^4$ cm${}^{-3}$.

8 pages, 3 Figures, 1 Table. https://pos.sissa.it/444/631/pdf