The Properties of Planck Galactic Cold Clumps in the L1495 Dark Cloud
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Tartalom: http://hdl.handle.net/10831/49065
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Cím:
The Properties of Planck Galactic Cold Clumps in the L1495 Dark Cloud
Létrehozó:
Mengyao, Tang
Tie, Liu
Sheng-Li, Qin
Kee-Tae, Kim
Yuefang, Wu
Ken'ichi, Tatematsu
Jinghua, Yuan
Ke, Wang
Harriet, Parsons
Patrick, M Koch
Patricio, Sanhueza
D, Ward-Thompson
L, Viktor Tóth
Archana, Soam
Chang, Won Lee
David, Eden
James, Di Francesco
Jonathan, Rawlings
Mark, G Rawlings
Julien, Montillaud
Chuan-Peng, Zhang
M R, Cunningham
Dátum:
2018
Tartalmi leírás:
Planck Galactic Cold Clumps (PGCCs) possibly represent the early stages of star formation. To understand better the properties of PGCCs, we studied 16 PGCCs in the L1495 cloud with molecular lines and continuum data from Herschel, JCMT/SCUBA-2, and the PMO 13.7 m telescope. Thirty dense cores were identified in 16 PGCCs from 2D Gaussian fitting. The dense cores have dust temperatures of T-d = 11-14 K, and H-2 column densities of NH2 = (0.36-2.5) x 10(22) cm(-2). We found that not all PGCCs contain prestellar objects. In general, the dense cores in PGCCs are usually at their earliest evolutionary stages. All the dense cores have non-thermal velocity dispersions larger than the thermal velocity dispersions from molecular line data, suggesting that the dense cores may be turbulence-dominated. We have calculated the virial parameter a and found that 14 of the dense cores have alpha < 2, while 16 of the dense cores have alpha > 2. This suggests that some of the dense cores are not bound in the absence of external pressure and magnetic fields. The column density profiles of dense cores were fitted. The sizes of the flat regions and core radii decrease with the evolution of dense cores. CO depletion was found to occur in all the dense cores, but is more significant in prestellar core candidates than in protostellar or starless cores. The protostellar cores inside the PGCCs are still at a very early evolutionary stage, sharing similar physical and chemical properties with the prestellar core candidates.
Típus:
info:eu-repo/semantics/article
Formátum:
application/pdf
Azonosító:
doi:10.3847/1538-4357/aaadad
elte:000429040600015
elte:85045553131
elte:3356513
elte:2
elte:ASTROPHYS J
elte:ASTROPHYSICAL JOURNAL
elte:856
elte:10067248
Létrehozó:
info:eu-repo/semantics/openAccess