A study of Galactic Plane Planck Galactic cold clumps observed by SCOPE and the JCMT Plane Survey

Eden, D J; Liu, Tie; Moore, T J T; Di Francesco, J; Fuller, G; Kim, Kee-Tae; Li, Di; Liu, S-Y; Plume, R; Tatematsu, Ken’ichi; Thompson, M A; Wu, Y; Bronfman, L; Butner, H M; Currie, M J; Garay, G; Goldsmith, P F; Hirano, N; Johnstone, D; Juvela, M; Lai, S-P; Lee, C W; Mannfors, E E; Olguin, F; Pattle, K; Park, Geumsook; Polychroni, D; Rawlings, M; Rigby, A J; Sanhueza, P; Traficante, A; Urquhart, J S; Weferling, B; White, G. J. and Yadav, R K (2024). A study of Galactic Plane Planck Galactic cold clumps observed by SCOPE and the JCMT Plane Survey. Monthly Notices of the Royal Astronomical Society, 530(4) pp. 5192–5208.

DOI: https://doi.org/10.1093/mnras/stae1179

Abstract

We have investigated the physical properties of Planck Galactic Cold Clumps (PGCCs) located in the Galactic Plane, using the JCMT Plane Survey (JPS) and the SCUBA-2 Continuum Observations of Pre-protostellar Evolution (SCOPE) survey. By utilising a suite of molecular-line surveys, velocities and distances were assigned to the compact sources within the PGCCs, placing them in a Galactic context. The properties of these compact sources show no large-scale variations with Galactic environment. Investigating the star-forming content of the sample, we find that the luminosity-to-mass ratio (L/M) is an order of magnitude lower than in other Galactic studies, indicating that these objects are hosting lower levels of star formation. Finally, by comparing ATLASGAL sources that are associated or are not associated with PGCCs, we find that those associated with PGCCs are typically colder, denser, and have a lower L/M ratio, hinting that PGCCs are a distinct population of Galactic Plane sources.

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