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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

2018; Institute of Physics; Volume: 234; Issue: 2 Linguagem: Inglês

10.3847/1538-4365/aaa3dd

1538-4365

Tie Liu, Kee‐Tae Kim, M. Juvela, Ke Wang, Ken’ichi Tatematsu, James Di Francesco, Sheng‐Yuan Liu, Yuefang Wu, M. A. Thompson, G. A. Fuller, David Eden, Di Li, I. Ristorcelli, Sung-Ju Kang, Yuxin Lin, Doug Johnstone, Jinhua He, Patrick M. Koch, Patricio Sanhueza, Sheng‐Li Qin, Qizhou Zhang, Naomi Hirano, P. F. Goldsmith, Neal J. Evans, G. J. White, Minho Choi, Chang Won Lee, L. V. Tóth, Steve Mairs, Hee-Weon Yi, Mengyao Tang, Archana Soam, N. Peretto, M. R. Samal, Michel Fich, Harriet Parsons, Jinghua Yuan, Chuan-Peng Zhang, J. Malinen, G. J. Bendo, A. Rivera-Ingraham, Hong-Li Liu, J. G. A. Wouterloot, Pak Shing Li, Lei Qian, Jonathan Rawlings, Mark G. Rawlings, Siyi Feng, Yuri Aikawa, S. Akhter, D. Alina, Graham Bell, J.-P. Bernard, A. W. Blain, Rebeka Bögner, L. Bronfman, Do‐Young Byun, Scott Chapman, Huei-Ru Vivien Chen, M. Chen, Wen-Ping Chen, X. Chen, Xuepeng Chen, A. Chrysostomou, Giuliana Cosentino, Maria Cunningham, K. Demyk, E. Drabek-Maunder, Yasuo Doi, Chakali Eswaraiah, Edith Falgarone, O. Fehér, H. J. Fraser, Per Friberg, G. Garay, Jixing Ge, W. K. Gear, J. S. Greaves, X. Guan, Lisa Harvey-Smith, Tetsuo Hasegawa, J. Hatchell, Yuxin He, C. Henkel, Tomoya Hirota, W. Holland, A. Hughes, E. Jarken, Tae-Geun Ji, I. Jiménez-Serra, Miju Kang, Koji S. Kawabata, Gwanjeong Kim, Jungha Kim, Jongsoo Kim, Shinyoung Kim, Bon‐Chul Koo, Woojin Kwon, Y. Kuan, Kevin Lacaille, S. Lai, Chin‐Fei Lee, Jeong‐Eun Lee, Youngdae Lee, Dalei Li, Hua-bai Li, N. Lo, John Lopez, Xing Lu, A-Ran Lyo, D. Mardones, A. P. Marston, P. McGehee, F. Meng, L. Montier, J. Montillaud, Toby Moore, Ó. Morata, G. H. Moriarty‐Schieven, Satoshi Ohashi, Soojong Pak, Geumsook Park, R. Paladini, Kate Pattle, Gerardo Pech, V.-M. Pelkonen, Keping Qiu, Zhi-Yuan Ren, John Richer, M. Saito, Takeshi Sakai, Hsien Shang, Hiroko Shinnaga, Dimitris Stamatellos, Ya‐Wen Tang, A. Traficante, C. Vastel, S. Viti, Andrew Walsh, Bingru Wang, Hongchi Wang, Junzhi Wang, D. Ward‐Thompson, A. P. Whitworth, Ye Xu, Ji Yang, Yao-Lun Yang, Lixia Yuan, A. Zavagno, Guoyin Zhang, Huawei Zhang, Chenlin Zhou, Jianjun Zhou, Lei Zhu, Pei Zuo, Chao Zhang,

Stellar, planetary, and galactic studies

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 M☉ pc−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.