The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71
文献类型：期刊论文
| 作者 | Tobin, John J.1,2,14; Bourke, Tyler L.3; Mader, Stacy4; Kristensen, Lars5,6; Arce, Hector7; Gueth, Frederic8; Gusdorf, Antoine9; Codella, Claudio10,11; Leurini, Silvia12; Chen, Xuepeng13
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2019-01-10 |
| 卷号 | 870期号:2页码:30 |
| ISSN号 | 0004-637X |
| 关键词 | ISM: individual objects (BHR71) ISM: kinematics and dynamics ISM: molecules stars: formation stars: protostars techniques: interferometric |
| DOI | 10.3847/1538-4357/aaef87 |
| 通讯作者 | Tobin, John J.(jtobin@nrao.edu) |
| 英文摘要 | We present a characterization of the binary protostar system that is forming within a dense core in the isolated dark cloud BHR71. The pair of protostars, IRS1 and IRS2, are both in the Class 0 phase, determined from observations that resolve the sources from 1 mu m out to 250 mu m and from 1.3. mm to 1.3. cm. The resolved observations enable the luminosities of IRS1 and IRS2 to be independently measured (14.7 and 1.7 L-circle dot, respectively), in addition to the bolometric temperatures 68 K and 38 K, respectively. The surrounding core was mapped in NH3 (1, 1) with the Parkes radio telescope, and followed with higher-resolution observations from ATCA in NH3 (1, 1) and 1.3. cm continuum. The protostars were then further characterized with ALMA observations in the 1.3. mm continuum along with N2D+ (J = 3 -> 2), (CO)-C-12, (CO)-C-13, and (CO)-O-18 (J = 2 -> 1) molecular lines. The Parkes observations find evidence for a velocity gradient across the core surrounding the two protostars, while ATCA reveals more complex velocity structure toward the protostars within the large-scale gradient. The ALMA observations then reveal that the two protostars are at the same velocity in (CO)-O-18, and N2D+ exhibits a similar velocity structure as NH3. However, the (CO)-O-18 kinematics reveal that the rotation on scales < 1000. au around IRS1 and IRS2 are in opposite directions. Taken with the lack of a systematic velocity difference between the pair, it is unlikely that their formation resulted from rotational fragmentation. We instead conclude that the binary system most likely formed via turbulent fragmentation of the core. |
| WOS关键词 | MOLECULAR CLOUD CORES ; SMALL DARK CLOUDS ; DENSE CORES ; STAR-FORMATION ; BOLOMETRIC TEMPERATURE ; MAGNETIC-FIELDS ; BOK GLOBULES ; STELLAR ; FRAGMENTATION ; COLLAPSE |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000455820100027 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/19237]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Tobin, John J. |
| 作者单位 | 1.Univ Oklahoma, Homer L Dodge Dept Phys & Astron, 440 W Brooks St, Norman, OK 73019 USA 2.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands 3.Jodrell Bank Observ, SKA Org, Macclesfield SK11 9DL, Cheshire, England 4.Parkes Observ, CSIRO Astron & Space Sci, POB 276, Parkes, NSW 2870, Australia 5.Univ Copenhagen, Ctr Star & Planet Format, Niels Bohr Inst, Oster Voldgade 5-7, DK-1350 Copenhagen K, Denmark 6.Univ Copenhagen, Nat Hist Museum Denmark, Oster Voldgade 5-7, DK-1350 Copenhagen K, Denmark 7.Yale Univ, Dept Astron, POB 208101, New Haven, CT 06520 USA 8.Inst Radioastron Millimetr IRAM, F-38406 St Martin Dheres, France 9.UPMC Univ Paris 06, Sorbonne Univ, Observ Paris, CNRS,LERMA,Ecole Normale Super,PSL Res Univ, F-75231 Paris, France 10.Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy |
| 推荐引用方式 GB/T 7714 | Tobin, John J.,Bourke, Tyler L.,Mader, Stacy,et al. The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71[J]. ASTROPHYSICAL JOURNAL,2019,870(2):30. |
| APA | Tobin, John J..,Bourke, Tyler L..,Mader, Stacy.,Kristensen, Lars.,Arce, Hector.,...&Chen, Xuepeng.(2019).The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71.ASTROPHYSICAL JOURNAL,870(2),30. |
| MLA | Tobin, John J.,et al."The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71".ASTROPHYSICAL JOURNAL 870.2(2019):30. |
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