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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

Liu, T, Kim, K-T, Juvela, M, Wang, K, Tatematsu, K, Di Francesco, J, Liu, S-Y, Wu, Y, Thompson, M, Fuller, G, Eden, DJ, Li, D, Ristorcelli, I, Kang, S-J, Lin, Y, Johnstone, D, He, JH, Koch, PM, Sanhueza, P, Qin, S-L , Zhang, Q, Hirano, N, Goldsmith, PF, Evans, NJ, White, GJ, Choi, M, Lee, CW, Toth, LV, Mairs, S, Yi, H-W, Tang, M, Soam, A, Peretto, N, Samal, MR, Fich, M, Parsons, H, Yuan, J, Zhang, C-P, Malinen, J, Bendo, GJ, Rivera-Ingraham, A, Liu, H-L, Wouterloot, J, Li, PS, Qian, L, Rawlings, J, Rawlings, MG, Feng, S, Aikawa, Y, Akhter, S, Alina, D, Bell, G, Bernard, J-P, Blain, A, Bogner, R, Bronfman, L, Byun, D-Y, Chapman, S, Chen, H-R, Chen, M, Chen, W-P, Chen, X, Chen, X, Chrysostomou, A, Cosentino, G, Cunningham, MR, Demyk, K, Drabek-Maunder, E, Doi, Y, Eswaraiah, C, Falgarone, E, Feher, O, Fraser, H, Friberg, P, Garay, G, Ge, JX, Gear, WK, Greaves, J, Guan, X, Harvey-Smith, L, Hasegawa, T, Hatchell, J, He, Y, Henkel, C, Hirota, T, Holland, W, Hughes, A, Jarken, E, Ji, T-G, Jimenez-Serra, I, Kang, M, Kawabata, KS, Kim, G, Kim, J, Kim, J, Kim, S, Koo, B-C, Kwon, W, Kuan, Y-J, Lacaille, KM, Lai, S-P, Lee, CF, Lee, J-E, Lee, Y-U, Li, D, Li, H-B, Lo, N, Lopez, JAP, Lu, X, Lyo, A-R, Mardones, D, Marston, A, McGehee, P, Meng, F, Montier, L, Montillaud, J, Moore, TJT, Morata, O, Moriarty-Schieven, GH, Ohashi, S, Pak, S, Park, G, Paladini, R, Pattle, KM, Pech, G, Pelkonen, V-M, Qiu, K, Ren, Z-Y, Richer, J, Saito, M, Sakai, T, Shang, H, Shinnaga, H, Stamatellos, D, Tang, Y-W, Traficante, A, Vastel, C, Viti, S, Walsh, A, Wang, B, Wang, H, Wang, J, Ward-Thompson, D, Whitworth, A, Xu, Y, Yang, J, Yang, Y-L, Yuan, L, Zavagno, A, Zhang, G, Zhang, H-W, Zhou, C, Zhou, J, Zhu, L, Zuo, P and Zhang, C (2018) The TOP-SCOPE Survey of Planck Galactic Cold Clumps: Survey Overview and Results of an Exemplar Source, PGCC G26.53+0.17. The Astrophysical Journal, Supplement Series, 234 (2). ISSN 0067-0049

The TOP-SCOPE Survey of Planck Galactic Cold Clumps Survey Overview and Results of an Exemplar Source, PGCC G26.53+0.17.pdf - Published Version

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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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Related URLs:
Date Deposited: 06 Mar 2018 10:28
Last Modified: 06 Mar 2018 10:28
DOI or Identification number: 10.3847/1538-4365/aaa3dd
URI: http://researchonline.ljmu.ac.uk/id/eprint/8189

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