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

Tie Liu; Kee-Tae Kim; Mika Juvela; Ke Wang; Ken'ichi Tatematsu; James Di Francesco; Sheng-Yuan Liu; Yuefang Wu; Mark Thompson; Gary Fuller; David Eden; Di Li; I. Ristorcelli; Sung-ju Kang; Yuxin Lin; D. Johnstone; J. H. He; P. M. Koch; Patricio Sanhueza; Sheng-Li Qin; Q. Zhang; N. Hirano; Paul F. Goldsmith; Neal J. Evans; Glenn J. White; Minho Choi; Chang Won Lee; L. V. Toth; Steve Mairs; H.- W. Yi; Mengyao Tang; Archana Soam; N. Peretto; Manash R. Samal; Michel Fich; Harriet Parsons; Jinghua Yuan; Chuan-Peng Zhang; Johanna Malinen; George J. Bendo; A. Rivera-Ingraham; Hong-Li Liu; Jan Wouterloot; Pak Shing Li; Lei Qian; Jonathan Rawlings; Mark G. Rawlings; Siyi Feng; Yuri Aikawa; S. Akhter; Dana Alina; Graham Bell; J.- P. Bernard; Andrew Blain; Rebeka Bogner; L. Bronfman; D.- Y. Byun; Scott Chapman; Huei-Ru Chen; M. Chen; Wen-Ping Chen; X. Chen; Xuepeng Chen; A. Chrysostomou; Giuliana Cosentino; M. R. Cunningham; K. Demyk; Emily Drabek-Maunder; Yasuo Doi; C. Eswaraiah; Edith Falgarone; O. Feher; Helen Fraser; Per Friberg; G. Garay; J. X. Ge; W. K. Gear; Jane Greaves; X. Guan; Lisa Harvey-Smith; Tetsuo Hasegawa; J. Hatchell; Yuxin He; C. Henkel; T. Hirota; W. Holland; A. Hughes; E. Jarken; Tae-Geun Ji; Izaskun Jimenez-Serra; Miju Kang; Koji S. Kawabata; Gwanjeong Kim; Jungha Kim; Jongsoo Kim; Shinyoung Kim; B.- C. Koo; Woojin Kwon; Yi-Jehng Kuan; K. M. Lacaille; Shih-Ping Lai; C. F. Lee; J.- E. Lee; Y.- U. Lee; Dalei Li; Hua-bai Li; N. Lo; John A. P. Lopez; Xing Lu; A-Ran Lyo; D. Mardones; A. Marston; P. McGehee; F. Meng; L. Montier; Julien Montillaud; T. Moore; O. Morata; Gerald H. Moriarty-Schieven; S. Ohashi; Soojong Pak; Geumsook Park; R. Paladini; Kate M. Pattle; Gerardo Pech; V.- M. Pelkonen; K. Qiu; Zhi-Yuan Ren; John Richer; M. Saito; Takeshi Sakai; H. Shang; Hiroko Shinnaga; Dimitris Stamatellos; Y.- W. Tang; Alessio Traficante; Charlotte Vastel; S. Viti; Andrew Walsh; Bingru Wang; Hongchi Wang; Junzhi Wang; D. Ward-Thompson; Anthony Whitworth; Ye Xu; J. Yang; Yao-Lun Yang; Lixia Yuan; A. Zavagno; Guoyin Zhang; H.- W. Zhang; Chenlin Zhou; Jianjun Zhou; Lei Zhu; Pei Zuo; Chao Zhang

doi:10.3847/1538-4365/aaa3dd

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

Tie Liu, Kee-Tae Kim, Mika Juvela, Ke Wang, Ken'ichi Tatematsu, James Di Francesco, Sheng-Yuan Liu, Yuefang Wu, Mark Thompson, Gary Fuller, David Eden, Di Li, I. Ristorcelli, Sung-ju Kang, Yuxin Lin, D. Johnstone, J. H. He, P. M. Koch, Patricio Sanhueza, Sheng-Li QinQ. Zhang, N. Hirano, Paul F. Goldsmith, Neal J. Evans, Glenn J. White, Minho Choi, Chang Won Lee, L. V. Toth, Steve Mairs, H.- W. Yi, Mengyao Tang, Archana Soam, N. Peretto, Manash R. Samal, Michel Fich, Harriet Parsons, Jinghua Yuan, Chuan-Peng Zhang, Johanna Malinen, George J. Bendo, A. Rivera-Ingraham, Hong-Li Liu, Jan Wouterloot, Pak Shing Li, Lei Qian, Jonathan Rawlings, Mark G. Rawlings, Siyi Feng, Yuri Aikawa, S. Akhter, Dana Alina, Graham Bell, J.- P. Bernard, Andrew Blain, Rebeka Bogner, L. Bronfman, D.- Y. Byun, Scott Chapman, Huei-Ru Chen, M. Chen, Wen-Ping Chen, X. Chen, Xuepeng Chen, A. Chrysostomou, Giuliana Cosentino, M. R. Cunningham, K. Demyk, Emily Drabek-Maunder, Yasuo Doi, C. Eswaraiah, Edith Falgarone, O. Feher, Helen Fraser, Per Friberg, G. Garay, J. X. Ge, W. K. Gear, Jane Greaves, X. Guan, Lisa Harvey-Smith, Tetsuo Hasegawa, J. Hatchell, Yuxin He, C. Henkel, T. Hirota, W. Holland, A. Hughes, E. Jarken, Tae-Geun Ji, Izaskun Jimenez-Serra, Miju Kang, Koji S. Kawabata, Gwanjeong Kim, Jungha Kim, Jongsoo Kim, Shinyoung Kim, B.- C. Koo, Woojin Kwon, Yi-Jehng Kuan, K. M. Lacaille, Shih-Ping Lai, C. F. Lee, J.- E. Lee, Y.- U. Lee, Dalei Li, Hua-bai Li, N. Lo, John A. P. Lopez, Xing Lu, A-Ran Lyo, D. Mardones, A. Marston, P. McGehee, F. Meng, L. Montier, Julien Montillaud, T. Moore, O. Morata, Gerald H. Moriarty-Schieven, S. Ohashi, Soojong Pak, Geumsook Park, R. Paladini, Kate M. Pattle, Gerardo Pech, V.- M. Pelkonen, K. Qiu, Zhi-Yuan Ren, John Richer, M. Saito, Takeshi Sakai, H. Shang, Hiroko Shinnaga, Dimitris Stamatellos, Y.- W. Tang, Alessio Traficante, Charlotte Vastel, S. Viti, Andrew Walsh, Bingru Wang, Hongchi Wang, Junzhi Wang, D. Ward-Thompson, Anthony Whitworth, Ye Xu, J. Yang, Yao-Lun Yang, Lixia Yuan, A. Zavagno, Guoyin Zhang, H.- W. Zhang, Chenlin Zhou, Jianjun Zhou, Lei Zhu, Pei Zuo, Chao Zhang

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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 similar to 2000 PGCCs in J = 1-0 transitions of CO isotopologues and similar to 1000 PGCCs in 850 mu m 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 similar to 6200 M-circle dot, similar to 12 pc, and similar to 500 M-circle dot 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 (beta) 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.

Original language	English
Article number	28
Number of pages	31
Journal	Astrophysical Journal Supplement Series
Volume	234
Issue number	2
DOIs	https://doi.org/10.3847/1538-4365/aaa3dd
Publication status	Published - 2018

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10.3847/1538-4365/aaa3dd

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Liu, T., Kim, K.-T., Juvela, M., Wang, K., Tatematsu, K., Di Francesco, J., Liu, S.-Y., Wu, Y., Thompson, M., Fuller, G., Eden, D., Li, D., Ristorcelli, I., Kang, S., Lin, Y., Johnstone, D., He, J. H., Koch, P. M., Sanhueza, P., ... 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. Astrophysical Journal Supplement Series, 234(2), Article 28. https://doi.org/10.3847/1538-4365/aaa3dd

@article{5a0184a6870f4bc882fae3ab8d579b00,

title = "The TOP-SCOPE survey of Planck Galactic cold clumps : survey overview and results of an exemplar source, PGCC G26.53+0.17",

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 similar to 2000 PGCCs in J = 1-0 transitions of CO isotopologues and similar to 1000 PGCCs in 850 mu m 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 similar to 6200 M-circle dot, similar to 12 pc, and similar to 500 M-circle dot 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 (beta) 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.",

author = "Tie Liu and Kee-Tae Kim and Mika Juvela and Ke Wang and Ken'ichi Tatematsu and {Di Francesco}, James and Sheng-Yuan Liu and Yuefang Wu and Mark Thompson and Gary Fuller and David Eden and Di Li and I. Ristorcelli and Sung-ju Kang and Yuxin Lin and D. Johnstone and He, {J. H.} and Koch, {P. M.} and Patricio Sanhueza and Sheng-Li Qin and Q. Zhang and N. Hirano and Goldsmith, {Paul F.} and Evans, {Neal J.} and White, {Glenn J.} and Minho Choi and Lee, {Chang Won} and Toth, {L. V.} and Steve Mairs and Yi, {H.- W.} and Mengyao Tang and Archana Soam and N. Peretto and Samal, {Manash R.} and Michel Fich and Harriet Parsons and Jinghua Yuan and Chuan-Peng Zhang and Johanna Malinen and Bendo, {George J.} and A. Rivera-Ingraham and Hong-Li Liu and Jan Wouterloot and Li, {Pak Shing} and Lei Qian and Jonathan Rawlings and Rawlings, {Mark G.} and Siyi Feng and Yuri Aikawa and S. Akhter and Dana Alina and Graham Bell and Bernard, {J.- P.} and Andrew Blain and Rebeka Bogner and L. Bronfman and Byun, {D.- Y.} and Scott Chapman and Huei-Ru Chen and M. Chen and Wen-Ping Chen and X. Chen and Xuepeng Chen and A. Chrysostomou and Giuliana Cosentino and Cunningham, {M. R.} and K. Demyk and Emily Drabek-Maunder and Yasuo Doi and C. Eswaraiah and Edith Falgarone and O. Feher and Helen Fraser and Per Friberg and G. Garay and Ge, {J. X.} and Gear, {W. K.} and Jane Greaves and X. Guan and Lisa Harvey-Smith and Tetsuo Hasegawa and J. Hatchell and Yuxin He and C. Henkel and T. Hirota and W. Holland and A. Hughes and E. Jarken and Tae-Geun Ji and Izaskun Jimenez-Serra and Miju Kang and Kawabata, {Koji S.} and Gwanjeong Kim and Jungha Kim and Jongsoo Kim and Shinyoung Kim and Koo, {B.- C.} and Woojin Kwon and Yi-Jehng Kuan and Lacaille, {K. M.} and Shih-Ping Lai and Lee, {C. F.} and Lee, {J.- E.} and Lee, {Y.- U.} and Dalei Li and Hua-bai Li and N. Lo and Lopez, {John A. P.} and Xing Lu and A-Ran Lyo and D. Mardones and A. Marston and P. McGehee and F. Meng and L. Montier and Julien Montillaud and T. Moore and O. Morata and Moriarty-Schieven, {Gerald H.} and S. Ohashi and Soojong Pak and Geumsook Park and R. Paladini and Pattle, {Kate M.} and Gerardo Pech and Pelkonen, {V.- M.} and K. Qiu and Zhi-Yuan Ren and John Richer and M. Saito and Takeshi Sakai and H. Shang and Hiroko Shinnaga and Dimitris Stamatellos and Tang, {Y.- W.} and Alessio Traficante and Charlotte Vastel and S. Viti and Andrew Walsh and Bingru Wang and Hongchi Wang and Junzhi Wang and D. Ward-Thompson and Anthony Whitworth and Ye Xu and J. Yang and Yao-Lun Yang and Lixia Yuan and A. Zavagno and Guoyin Zhang and Zhang, {H.- W.} and Chenlin Zhou and Jianjun Zhou and Lei Zhu and Pei Zuo and Chao Zhang",

year = "2018",

doi = "10.3847/1538-4365/aaa3dd",

language = "English",

volume = "234",

journal = "Astrophysical Journal Supplement Series",

issn = "0067-0049",

publisher = "Institute of Physics Publishing",

number = "2",

}

Liu, T, Kim, K-T, Juvela, M, Wang, K, Tatematsu, K, Di Francesco, J, Liu, S-Y, Wu, Y, Thompson, M, Fuller, G, Eden, D, Li, D, Ristorcelli, I, Kang, S, 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, HW, 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, JP, Blain, A, Bogner, R, Bronfman, L, Byun, DY, 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, BC, Kwon, W, Kuan, Y-J, Lacaille, KM, Lai, S-P, Lee, CF, Lee, JE, Lee, YU, Li, D, Li, H, Lo, N, Lopez, JAP, Lu, X, Lyo, A-R, Mardones, D, Marston, A, McGehee, P, Meng, F, Montier, L, Montillaud, J, Moore, T, Morata, O, Moriarty-Schieven, GH, Ohashi, S, Pak, S, Park, G, Paladini, R, Pattle, KM, Pech, G, Pelkonen, VM, Qiu, K, Ren, Z-Y, Richer, J, Saito, M, Sakai, T, Shang, H, Shinnaga, H, Stamatellos, D, Tang, YW, 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, HW, Zhou, C, Zhou, J, Zhu, L, Zuo, P & 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', Astrophysical Journal Supplement Series, vol. 234, no. 2, 28. https://doi.org/10.3847/1538-4365/aaa3dd

TY - JOUR

T1 - The TOP-SCOPE survey of Planck Galactic cold clumps : survey overview and results of an exemplar source, PGCC G26.53+0.17

AU - Liu, Tie

AU - Kim, Kee-Tae

AU - Juvela, Mika

AU - Wang, Ke

AU - Tatematsu, Ken'ichi

AU - Di Francesco, James

AU - Liu, Sheng-Yuan

AU - Wu, Yuefang

AU - Thompson, Mark

AU - Fuller, Gary

AU - Eden, David

AU - Li, Di

AU - Ristorcelli, I.

AU - Kang, Sung-ju

AU - Lin, Yuxin

AU - Johnstone, D.

AU - He, J. H.

AU - Koch, P. M.

AU - Sanhueza, Patricio

AU - Qin, Sheng-Li

AU - Zhang, Q.

AU - Hirano, N.

AU - Goldsmith, Paul F.

AU - Evans, Neal J.

AU - White, Glenn J.

AU - Choi, Minho

AU - Lee, Chang Won

AU - Toth, L. V.

AU - Mairs, Steve

AU - Yi, H.- W.

AU - Tang, Mengyao

AU - Soam, Archana

AU - Peretto, N.

AU - Samal, Manash R.

AU - Fich, Michel

AU - Parsons, Harriet

AU - Yuan, Jinghua

AU - Zhang, Chuan-Peng

AU - Malinen, Johanna

AU - Bendo, George J.

AU - Rivera-Ingraham, A.

AU - Liu, Hong-Li

AU - Wouterloot, Jan

AU - Li, Pak Shing

AU - Qian, Lei

AU - Rawlings, Jonathan

AU - Rawlings, Mark G.

AU - Feng, Siyi

AU - Aikawa, Yuri

AU - Akhter, S.

AU - Alina, Dana

AU - Bell, Graham

AU - Bernard, J.- P.

AU - Blain, Andrew

AU - Bogner, Rebeka

AU - Bronfman, L.

AU - Byun, D.- Y.

AU - Chapman, Scott

AU - Chen, Huei-Ru

AU - Chen, M.

AU - Chen, Wen-Ping

AU - Chen, X.

AU - Chen, Xuepeng

AU - Chrysostomou, A.

AU - Cosentino, Giuliana

AU - Cunningham, M. R.

AU - Demyk, K.

AU - Drabek-Maunder, Emily

AU - Doi, Yasuo

AU - Eswaraiah, C.

AU - Falgarone, Edith

AU - Feher, O.

AU - Fraser, Helen

AU - Friberg, Per

AU - Garay, G.

AU - Ge, J. X.

AU - Gear, W. K.

AU - Greaves, Jane

AU - Guan, X.

AU - Harvey-Smith, Lisa

AU - Hasegawa, Tetsuo

AU - Hatchell, J.

AU - He, Yuxin

AU - Henkel, C.

AU - Hirota, T.

AU - Holland, W.

AU - Hughes, A.

AU - Jarken, E.

AU - Ji, Tae-Geun

AU - Jimenez-Serra, Izaskun

AU - Kang, Miju

AU - Kawabata, Koji S.

AU - Kim, Gwanjeong

AU - Kim, Jungha

AU - Kim, Jongsoo

AU - Kim, Shinyoung

AU - Koo, B.- C.

AU - Kwon, Woojin

AU - Kuan, Yi-Jehng

AU - Lacaille, K. M.

AU - Lai, Shih-Ping

AU - Lee, C. F.

AU - Lee, J.- E.

AU - Lee, Y.- U.

AU - Li, Dalei

AU - Li, Hua-bai

AU - Lo, N.

AU - Lopez, John A. P.

AU - Lu, Xing

AU - Lyo, A-Ran

AU - Mardones, D.

AU - Marston, A.

AU - McGehee, P.

AU - Meng, F.

AU - Montier, L.

AU - Montillaud, Julien

AU - Moore, T.

AU - Morata, O.

AU - Moriarty-Schieven, Gerald H.

AU - Ohashi, S.

AU - Pak, Soojong

AU - Park, Geumsook

AU - Paladini, R.

AU - Pattle, Kate M.

AU - Pech, Gerardo

AU - Pelkonen, V.- M.

AU - Qiu, K.

AU - Ren, Zhi-Yuan

AU - Richer, John

AU - Saito, M.

AU - Sakai, Takeshi

AU - Shang, H.

AU - Shinnaga, Hiroko

AU - Stamatellos, Dimitris

AU - Tang, Y.- W.

AU - Traficante, Alessio

AU - Vastel, Charlotte

AU - Viti, S.

AU - Walsh, Andrew

AU - Wang, Bingru

AU - Wang, Hongchi

AU - Wang, Junzhi

AU - Ward-Thompson, D.

AU - Whitworth, Anthony

AU - Xu, Ye

AU - Yang, J.

AU - Yang, Yao-Lun

AU - Yuan, Lixia

AU - Zavagno, A.

AU - Zhang, Guoyin

AU - Zhang, H.- W.

AU - Zhou, Chenlin

AU - Zhou, Jianjun

AU - Zhu, Lei

AU - Zuo, Pei

AU - Zhang, Chao

PY - 2018

Y1 - 2018

N2 - 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 similar to 2000 PGCCs in J = 1-0 transitions of CO isotopologues and similar to 1000 PGCCs in 850 mu m 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 similar to 6200 M-circle dot, similar to 12 pc, and similar to 500 M-circle dot 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 (beta) 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.

AB - 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 similar to 2000 PGCCs in J = 1-0 transitions of CO isotopologues and similar to 1000 PGCCs in 850 mu m 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 similar to 6200 M-circle dot, similar to 12 pc, and similar to 500 M-circle dot 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 (beta) 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.

UR - https://hdl.handle.net/1959.7/uws:63705

U2 - 10.3847/1538-4365/aaa3dd

DO - 10.3847/1538-4365/aaa3dd

M3 - Article

SN - 0067-0049

VL - 234

JO - Astrophysical Journal Supplement Series

JF - Astrophysical Journal Supplement Series

IS - 2

M1 - 28

ER -

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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