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Unveiling the Importance of Magnetic Fields in the Evolution of Dense Clumps Formed at the Waist of Bipolar HiiRegions: A Case Study of Sh 2-201 with JCMT SCUBA-2/POL-2
Eswaraiah, Chakali1,2,3; Li, Di1,4; Samal, Manash R.5,6; Wang, Jia-Wei2,3,7; Ma, Yuehui8,9,10; Lai, Shih-Ping2,3; Zavagno, Annie11,12; Ching, Tao-Chung1; Liu, Tie13; Pattle, Kate14,15; Ward-Thompson, Derek16; Pandey, Anil K.17; Ojha, Devendra K.18
2020-07-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume897Issue:1Pages:19
AbstractWe present the properties of magnetic fields (Bfields) in two clumps (clump 1 and clump 2), located at the waist of the bipolar Hiiregion Sh 2-201, based on James Clerk Maxwell Telescope SCUBA-2/POL-2 observations of 850 mu m polarized dust emission. We find thatBfields in the direction of the clumps are bent and compressed, showing bow-like morphologies, which we attribute to the feedback effect of the Hiiregion on the surface of the clumps. Using the modified Davis-Chandrasekhar-Fermi method, we estimateB-field strengths of 266 and 65 mu G for clump 1 and clump 2, respectively. From virial analyses and critical mass ratio estimates, we argue that clump 1 is gravitationally bound and could be undergoing collapse, whereas clump 2 is unbound and stable. We hypothesize that the interplay of the thermal pressure imparted by the Hiiregion, theB-field morphologies, and the various internal pressures of the clumps (such as magnetic, turbulent, and gas thermal pressures) has the following consequences: (a) formation of clumps at the waist of the Hiiregion; (b) progressive compression and enhancement of theBfields in the clumps; (c) strongerBfields that will shield the clumps from erosion by the Hiiregion and cause pressure equilibrium between the clumps and the Hiiregion, thereby allowing expanding ionization fronts to blow away from the filament ridge, forming bipolar Hiiregions; and (d) strongerBfields and turbulence that will be able to stabilize the clumps. A study of a larger sample of bipolar Hiiregions would help to determine whether our hypotheses are widely applicable.
KeywordInterstellar magnetic fields Magnetic fields H II regions Submillimeter astronomy Star formation Dust continuum emission Stellar feedback
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Ministry of Science and Technology (MOST) of Taiwan ; Ministry of Science and Technology (MOST) of Taiwan ; Institut Universitaire de France ; Institut Universitaire de France ; Department of Atomic Energy, Government of India ; Department of Atomic Energy, Government of India ; Science and Technology Facilities Council of the United Kingdom ; Science and Technology Facilities Council of the United Kingdom ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Ministry of Science and Technology (MOST) of Taiwan ; Ministry of Science and Technology (MOST) of Taiwan ; Institut Universitaire de France ; Institut Universitaire de France ; Department of Atomic Energy, Government of India ; Department of Atomic Energy, Government of India ; Science and Technology Facilities Council of the United Kingdom ; Science and Technology Facilities Council of the United Kingdom ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Ministry of Science and Technology (MOST) of Taiwan ; Ministry of Science and Technology (MOST) of Taiwan ; Institut Universitaire de France ; Institut Universitaire de France ; Department of Atomic Energy, Government of India ; Department of Atomic Energy, Government of India ; Science and Technology Facilities Council of the United Kingdom ; Science and Technology Facilities Council of the United Kingdom ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Ministry of Science and Technology (MOST) of Taiwan ; Ministry of Science and Technology (MOST) of Taiwan ; Institut Universitaire de France ; Institut Universitaire de France ; Department of Atomic Energy, Government of India ; Department of Atomic Energy, Government of India ; Science and Technology Facilities Council of the United Kingdom ; Science and Technology Facilities Council of the United Kingdom
DOI10.3847/1538-4357/ab83f2
WOS KeywordH-II REGIONS ; TRIGGERED STAR-FORMATION ; MOLECULAR CLOUDS ; MAGNETOHYDRODYNAMIC SIMULATIONS ; INTERSTELLAR CLOUDS ; RADIATIVE TORQUES ; HYDRODYNAMIC INTERACTION ; SHOCK INTERACTIONS ; FORMATION RATES ; HII-REGIONS
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[11988101] ; National Natural Science Foundation of China (NSFC)[11725313] ; International Partnership Program of Chinese Academy of Sciences[114A11KYSB20160008] ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Ministry of Science and Technology (MOST) of Taiwan[MOST 106-2119-M-007-021-MY3] ; Institut Universitaire de France ; Department of Atomic Energy, Government of India[12-RD-TFR-5.02-0200] ; Science and Technology Facilities Council of the United Kingdom
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Ministry of Science and Technology (MOST) of Taiwan ; Ministry of Science and Technology (MOST) of Taiwan ; Institut Universitaire de France ; Institut Universitaire de France ; Department of Atomic Energy, Government of India ; Department of Atomic Energy, Government of India ; Science and Technology Facilities Council of the United Kingdom ; Science and Technology Facilities Council of the United Kingdom ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Ministry of Science and Technology (MOST) of Taiwan ; Ministry of Science and Technology (MOST) of Taiwan ; Institut Universitaire de France ; Institut Universitaire de France ; Department of Atomic Energy, Government of India ; Department of Atomic Energy, Government of India ; Science and Technology Facilities Council of the United Kingdom ; Science and Technology Facilities Council of the United Kingdom ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Ministry of Science and Technology (MOST) of Taiwan ; Ministry of Science and Technology (MOST) of Taiwan ; Institut Universitaire de France ; Institut Universitaire de France ; Department of Atomic Energy, Government of India ; Department of Atomic Energy, Government of India ; Science and Technology Facilities Council of the United Kingdom ; Science and Technology Facilities Council of the United Kingdom ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Ministry of Science and Technology (MOST) of Taiwan ; Ministry of Science and Technology (MOST) of Taiwan ; Institut Universitaire de France ; Institut Universitaire de France ; Department of Atomic Energy, Government of India ; Department of Atomic Energy, Government of India ; Science and Technology Facilities Council of the United Kingdom ; Science and Technology Facilities Council of the United Kingdom
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000549172200001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82719
Collection中国科学院国家天文台
Corresponding AuthorEswaraiah, Chakali
Affiliation1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab FAST, Datun Rd, Beijing 100101, Peoples R China
2.Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan
3.Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
4.Univ Chinese Acad Sci UCAS, Beijing 100049, Peoples R China
5.Phys Res Lab PRL, Ahmadabad 380009, Gujarat, India
6.Natl Cent Univ, Grad Inst Astron, Jhongli 32001, Taoyuan County, Taiwan
7.Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,AS NTU 1,Sect 4,Roosevelt Rd, Taipei 10617, Taiwan
8.Chinese Acad Sci, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210033, Peoples R China
9.Chinese Acad Sci, Key Lab Radio Astron, 10 Yuanhua Rd, Nanjing 210033, Peoples R China
10.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
11.Aix Marseille Univ, LAM, CNES, CNRS, Marseille, France
12.Inst Univ France, Paris, France
13.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
14.Natl Tsing Hua Univ NTHU, Inst Astron, 101,Sect 2,Kuang Fu Rd, Hsinchu 30013, Taiwan
15.Natl Univ Ireland Galway, Ctr Astron, Sch Phys, Univ Rd, Galway, Ireland
16.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England
17.Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002, Uttarakhand, India
18.Tata Inst Fundamental Res, Dept Astron & Astrophys, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India
Recommended Citation
GB/T 7714
Eswaraiah, Chakali,Li, Di,Samal, Manash R.,et al. Unveiling the Importance of Magnetic Fields in the Evolution of Dense Clumps Formed at the Waist of Bipolar HiiRegions: A Case Study of Sh 2-201 with JCMT SCUBA-2/POL-2[J]. ASTROPHYSICAL JOURNAL,2020,897(1):19.
APA Eswaraiah, Chakali.,Li, Di.,Samal, Manash R..,Wang, Jia-Wei.,Ma, Yuehui.,...&Ojha, Devendra K..(2020).Unveiling the Importance of Magnetic Fields in the Evolution of Dense Clumps Formed at the Waist of Bipolar HiiRegions: A Case Study of Sh 2-201 with JCMT SCUBA-2/POL-2.ASTROPHYSICAL JOURNAL,897(1),19.
MLA Eswaraiah, Chakali,et al."Unveiling the Importance of Magnetic Fields in the Evolution of Dense Clumps Formed at the Waist of Bipolar HiiRegions: A Case Study of Sh 2-201 with JCMT SCUBA-2/POL-2".ASTROPHYSICAL JOURNAL 897.1(2020):19.
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