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First BISTRO observations of the dark cloud Taurus L1495A-B10: the role of the magnetic field in the earliest stages of low-mass star formation

Ward-Thompson, D, Karoly, J, Pattle, K, Whitworth, A, Kirk, J, Berry, D, Bastien, P, Ching, T-C, Coude, S, Hwang, J, Kwon, W, Soam, A, Wang, J-W, Hasegawa, T, Lai, S-P, Qiu, K, Arzoumanian, D, Bourke, TL, Byun, D-Y, Chen, H-RV , Chen, WP, Chen, M, Chen, Z, Cho, J, Choi, M, Choi, Y, Choi, Y, Chrysostomou, A, Chung, EJ, Dai, S, Debattista, V, Francesco, JD, Diep, PN, Doi, Y, Duan, H-Y, Duan, Y, Eswaraiah, C, Fanciullo, L, Fiege, J, Fissel, LM, Franzmann, E, Friberg, P, Friesen, R, Fuller, G, Furuya, R, Gledhill, T, Graves, S, Greaves, J, Griffin, M, Gu, Q, Han, I, Hayashi, S, Hoang, T, Houde, M, Hull, CLH, Inoue, T, Inutsuka, S-I, Iwasaki, K, Jeong, I-G, Johnstone, D, Konyves, V, Kang, J-H, Kang, M, Kataoka, A, Kawabata, K, Kemper, F, Kim, J, Kim, S, Kim, G, Kim, KH, Kim, M-R, Kim, K-T, Kim, H, Kirchschlager, F, Kobayashi, MIN, Koch, PM, Kusune, T, Kwon, J, Lacaille, K, Law, C-Y, Lee, CW, Lee, H, Lee, Y-H, Lee, C-F, Lee, J-E, Lee, S-S, Li, D, Li, D, Li, G, Li, H-B, Lin, S-J, Liu, H-L, Liu, T, Liu, S-Y, Liu, J, Longmore, S, Lu, X, Lyo, A-R, Mairs, S, Matsumura, M, Matthews, B, Moriarty-Schieven, G, Nagata, T, Nakamura, F, Nakanishi, H, Ngoc, NB, Ohashi, N, Onaka, T, Park, G, Parsons, H, Peretto, N, Priestley, F, Pyo, T-S, Qian, L, Rao, R, Rawlings, J, Rawlings, M, Retter, B, Richer, J, Rigby, A, Sadavoy, S, Saito, H, Savini, G, Seta, M, Shimajiri, Y, Shinnaga, H, Tahani, M, Tamura, M, Tang, Y-W, Tang, X, Tomisaka, K, Tram, LN, Tsukamoto, Y, Viti, S, Wang, H, Wu, J, Xie, J, Yang, M-Z, Yen, H-W, Yoo, H, Yuan, J, Yun, H-S, Zenko, T, Zhang, G, Zhang, Y, Zhang, C-P, Zhou, J, Zhu, L, Looze, ID, Andre, P, Dowell, CD, Eden, D, Eyres, S, Falle, S, Gouellec, VJML, Poidevin, F, Robitaille, J-F and Loo, SV (2023) First BISTRO observations of the dark cloud Taurus L1495A-B10: the role of the magnetic field in the earliest stages of low-mass star formation. The Astrophysical Journal, 946 (2). ISSN 1538-4357

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Open Access URL: https://doi.org/10.3847/1538-4357/acbea4 (published)


We present BISTRO Survey 850 µm dust emission polarisation observations of the L1495A-B10 region of the Taurus molecular cloud, taken at the JCMT. We observe a roughly triangular network of dense filaments. We detect 9 of the dense starless cores embedded within these filaments in polarisation, finding that the plane-of-sky orientation of the core-scale magnetic field lies roughly perpendicular to the filaments in almost all cases. We also find that the large-scale magnetic field orientation measured by Planck is not correlated with any of the core or filament structures, except in the case of the lowestdensity core. We propose a scenario for early prestellar evolution that is both an extension to, and consistent with, previous models, introducing an additional evolutionary transitional stage between field-dominated and matter-dominated evolution, observed here for the first time. In this scenario, the cloud collapses first to a sheet-like structure. Uniquely, we appear to be seeing this sheet almost faceon. The sheet fragments into filaments, which in turn form cores. However, the material must reach a certain critical density before the evolution changes from being field-dominated to being matterdominated. We measure the sheet surface density and the magnetic field strength at that transition for the first time and show consistency with an analytical prediction that had previously gone untested for over 50 years (Mestel 1965).

Item Type: Article
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA; astro-ph.SR
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Related URLs:
SWORD Depositor: A Symplectic
Date Deposited: 05 Apr 2023 09:20
Last Modified: 05 Apr 2023 09:30
DOI or ID number: 10.3847/1538-4357/acbea4
URI: https://researchonline.ljmu.ac.uk/id/eprint/18959
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