ALMA and VLBA views on the outflow associated with an O-type protostar in G26.50+0.28
文献类型：期刊论文
| 作者 | Wu, Gang1,6 ; Henkel, Christian1,2,6; Xu, Ye3; Brunthaler, Andreas6; Menten, Karl M.6; Qiu, Keping4; Li, Jingjing3; Zhang, Bo5; Esimbek, Jarken1
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2023-09-08 |
| 卷号 | 677页码:A80 |
| 关键词 | ISM: jets and outflows stars: formation masers radio lines: ISM |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202345893 |
| 产权排序 | 2 |
| 英文摘要 | Protostellar jets and outflows are essential ingredients of the star formation process. A better understanding of this phenomenon is important in its own right as well as for many fundamental aspects of star formation. Jets and outflows associated with O-type protostars are rarely studied with observations reaching the close vicinity of the protostars. In this work, we report high-resolution ALMA and VLBA observations to reveal a clear and consistent picture of an outflow associated with an O-type protostar candidate in the G26.50+0.28 region. These observations reveal, for the first time, a collimated jet located in the middle of the outflow cavity. The jet is found to be perpendicular to an elongated disk/toroid and its velocity gradient. The collimated jet appears to show a small amplitude (a & AP;0 & DEG;.06) counterclockwise precession, when looking along the blueshifted jet axis from the strongest continuum source MM1, with a precession length of 0.22 pc. The inclination of the jet is likely to be very low (& AP;8 & DEG;), which makes it a promising target to study its transverse morphologies and kinematics. However, no clear evidence of jet rotation is found in the ALMA and VLBA observations. The three-dimensional velocities of the water maser spots appear to show the same absolute speed with respect to different opening angles, suggesting the jet winds may be launched in a relatively small region. This favors the X-wind model, that is, jets are launched in a small area near the inner disk edge. |
| WOS关键词 | MOLECULAR OUTFLOWS ; ACCRETION DISKS ; JET ; STAR ; VELOCITY ; COLLIMATION ; PARALLAXES ; DRIVEN ; MASER ; AU |
| 资助项目 | National Key R&D Program of China[2022YFA1603103] ; CAS Light ofWest China Program[2021-XBQNXZ-028] ; National Natural Science foundation of China[12103082] ; National Natural Science foundation of China[11603063] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region[2022D01A362] ; Youth Innovation Promotion Association CAS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001065619100002 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | National Key R&D Program of China ; CAS Light ofWest China Program ; National Natural Science foundation of China ; Natural Science Foundation of Xinjiang Uygur Autonomous Region ; Youth Innovation Promotion Association CAS |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5513]  |
| 专题 | 恒星形成与演化研究团组 |
| 通讯作者 | Wu, Gang |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 2.King Abdulaziz Univ, Astron Dept, POB 80203, Jeddah 21589, Saudi Arabia 3.Chinese Acad Sci, Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Peoples R China 4.Nanjing Univ, Sch Astron & Space Sci, 163 Xianlin Ave, Nanjing 210023, Peoples R China 5.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 6.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany |
| 推荐引用方式 GB/T 7714 | Wu, Gang,Henkel, Christian,Xu, Ye,et al. ALMA and VLBA views on the outflow associated with an O-type protostar in G26.50+0.28[J]. ASTRONOMY & ASTROPHYSICS,2023,677:A80. |
| APA | Wu, Gang.,Henkel, Christian.,Xu, Ye.,Brunthaler, Andreas.,Menten, Karl M..,...&Esimbek, Jarken.(2023).ALMA and VLBA views on the outflow associated with an O-type protostar in G26.50+0.28.ASTRONOMY & ASTROPHYSICS,677,A80. |
| MLA | Wu, Gang,et al."ALMA and VLBA views on the outflow associated with an O-type protostar in G26.50+0.28".ASTRONOMY & ASTROPHYSICS 677(2023):A80. |
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来源：新疆天文台
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