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        The TOP-SCOPE survey of Planck Galactic Cold Clumps : Survey overview and results of an exemplar source, PGCC G26.53+0.17

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        Liu_et_al_Accepted_Manuscript.pdf (PDF, 9Mb)
        Author
        Liu, Tie
        Kim, Kee-Tae
        Juvela, Mika
        Wang, Ke
        Tatematsu, Ken'ichi
        Francesco, James Di
        Liu, Sheng-Yuan
        Wu, Yuefang
        Thompson, Mark
        Fuller, Gary
        Eden, David
        Li, Di
        Ristorcelli, I.
        collaborations, TOP-SCOPE
        Attention
        2299/20075
        Abstract
        The low dust temperatures (<14 K) of Planck Galactic cold clumps (PGCCs) make them ideal targets to probe the initial conditions and very early phase of star formation. "TOP-SCOPE" is a joint survey program targeting ∼2000 PGCCs in J = 1-0 transitions of CO isotopologues and ∼1000 PGCCs in 850 μm continuum emission. The objective of the "TOP-SCOPE" survey and the joint surveys (SMT 10 m, KVN 21 m, and NRO 45 m) is to statistically study the initial conditions occurring during star formation and the evolution of molecular clouds, across a wide range of environments. The observations, data analysis, and example science cases for these surveys are introduced with an exemplar source, PGCC G26.53+0.17 (G26), which is a filamentary infrared dark cloud (IRDC). The total mass, length, and mean line mass (M/L) of the G26 filament are ∼6200 M, ∼12 pc, and ∼500 Mpc-1, respectively. Ten massive clumps, including eight starless ones, are found along the filament. The most massive clump as a whole may still be in global collapse, while its denser part seems to be undergoing expansion owing to outflow feedback. The fragmentation in the G26 filament from cloud scale to clump scale is in agreement with gravitational fragmentation of an isothermal, nonmagnetized, and turbulent supported cylinder. A bimodal behavior in dust emissivity spectral index (β) distribution is found in G26, suggesting grain growth along the filament. The G26 filament may be formed owing to large-scale compression flows evidenced by the temperature and velocity gradients across its natal cloud.
        Publication date
        2018-02-01
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4365/aaa3dd
        Other links
        http://hdl.handle.net/2299/20075
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