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dc.contributor.author | Liu, Junhao | - |
dc.contributor.author | Zhang, Qizhou | - |
dc.contributor.author | Qiu, Keping | - |
dc.contributor.author | Liu, Hauyu Baobab | - |
dc.contributor.author | Pillai, Thushara G. S. | - |
dc.contributor.author | Girart, Josep Miquel | - |
dc.contributor.author | Li, Zhi-Yun | - |
dc.contributor.author | Wang, Ke | - |
dc.date.accessioned | 2021-03-22T11:10:09Z | - |
dc.date.available | 2021-03-22T11:10:09Z | - |
dc.date.issued | 2020-06-01 | - |
dc.identifier | doi: 10.3847/1538-4357/ab9087 | - |
dc.identifier | issn: 1538-4357 | - |
dc.identifier.citation | Astrophysical Journal 895(2): 142 (2020) | - |
dc.identifier.uri | http://hdl.handle.net/10261/235378 | - |
dc.description.abstract | We present 1.3 mm ALMA dust polarization observations at a resolution of ∼0.02 pc for three massive molecular clumps, MM1, MM4, and MM9, in the infrared dark cloud G28.34+0.06. With these sensitive and high-resolution continuum data, MM1 is resolved into a cluster of condensations. The magnetic field structure in each clump is revealed by the polarized emission. We found a trend of decreasing polarized emission fraction with increasing Stokes I intensities in MM1 and MM4. Using the angular dispersion function method (a modified Davis-Chandrasekhar-Fermi method), the plane-of-sky magnetic field strengths in two massive dense cores, MM1-Core1 and MM4-Core4, are estimated to be ∼1.6 mG and ∼0.32 mG, respectively. The virial parameters in MM1-Core1 and MM4-Core4 are calculated to be ∼0.76 and ∼0.37, respectively, suggesting that massive star formation does not start in equilibrium. Using the polarization-intensity gradient-local gravity method, we found that the local gravity is closely aligned with intensity gradient in the three clumps, and the magnetic field tends to be aligned with the local gravity in MM1 and MM4 except for regions near the emission peak, which suggests that the gravity plays a dominant role in regulating the gas collapse. Half of the outflows in MM4 and MM9 are found to be aligned within 10 of the condensation-scale (<0.05 pc) magnetic field, indicating that the magnetic field could play an important role from condensation to disk scale in the early stage of massive star formation. | - |
dc.description.sponsorship | K.Q. and J.L. are supported by National Key R&D Program of China No. 2017YFA0402600. K.Q. and J.L. acknowledge the support from National Natural Science Foundation of China (NSFC) through grants U1731237, 11590781, and 11629302. J.L. acknowledges the support from the program of China Scholarship Council (No. 201806190134) and from the Smithsonian Astrophysical Observatory pre-doctoral fellowship. JMG is supported by the Spanish grant AYA2017- 84390-C2-R (AEI/FEDER, UE). ZYL is supported in part by NASA 80NSSC18K1095 and NSF AST-1716259 and 1815784. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2016.1.00248.S and ADS/JAO.ALMA#2017.1.00793.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research made use of astrodendro, a Python package to compute dendrograms of Astronomical data (http://www.dendrograms.org/), APLpy, an open-source plotting package for Python (Robitaille & Bressert 2012), Astropy, a communitydeveloped core Python package for Astronomy (Astropy Collaboration et al. 2013), and Matplotlib, a Python 2D plotting library for Python (Hunter 2007). | - |
dc.language | eng | - |
dc.publisher | IOP Publishing | - |
dc.relation | info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/AYA2017- 84390-C2-R | - |
dc.relation.isversionof | Preprint | - |
dc.rights | openAccess | - |
dc.subject | Polarization | - |
dc.subject | Magnetic fields | - |
dc.subject | ISM: individual objects (IRDC G28.34+0.06) | - |
dc.subject | Stars: formation | - |
dc.title | Magnetic Fields in the Early Stages of Massive Star Formation as Revealed by ALMA | - |
dc.type | artículo | - |
dc.identifier.doi | 10.3847/1538-4357/ab9087 | - |
dc.relation.publisherversion | http://doi.org/10.3847/1538-4357/ab9087 | - |
dc.date.updated | 2021-03-22T11:10:09Z | - |
dc.contributor.funder | National Natural Science Foundation of China | - |
dc.contributor.funder | China Scholarship Council | - |
dc.contributor.funder | Ministerio de Economía y Competitividad (España) | - |
dc.contributor.funder | National Science Foundation (US) | - |
dc.contributor.funder | National Institutes of Natural Sciences (Japan) | - |
dc.contributor.funder | National Research Council of Canada | - |
dc.contributor.funder | Ministry of Science and Technology (Taiwan) | - |
dc.contributor.funder | Academia Sinica (Taiwan) | - |
dc.contributor.funder | Korea Astronomy and Space Science Institute | - |
dc.contributor.funder | Ministerio de Ciencia e Innovación (España) | - |
dc.relation.csic | Sí | - |
dc.identifier.funder | http://dx.doi.org/10.13039/501100004543 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100003717 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100004837 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100003329 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100006321 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100001809 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100000046 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/100000001 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100001869 | es_ES |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.cerifentitytype | Publications | - |
item.openairetype | artículo | - |
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