水激波在人马座B2复合体中的分布及其内部运动

IF 2.2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Daisuke Sakai, Tomoaki Oyama, Takumi Nagayama, Mareki Honma, Hideyuki Kobayashi
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引用次数: 0

摘要

摘要:我们对银河系中心最活跃的恒星形成区之一人马座B2 (Sgr B2)复星相关的22 GHz H2O脉泽源进行了多历元甚长基线干涉测量(VLBI)观测。利用射电天文测量(VERA)阵列的VLBI探测,我们在Sgr B2(北)、(主)和(南)分别探测到29、90和7个脉泽特征。我们还在Sgr B2(中北)中发现了两个H2O脉泽特征。此外,我们成功地测量了Sgr B2(M)中H2O脉泽源的空间分布和内部运动。然后,我们发现Sgr B2(M)中的H2O脉泽特征位于厘米射电连续发射探测到的H ii区域的外缘,并观测证明它们从相隔1 '的两个H ii区域向外运动。我们得到了(μαcos δ, μδ) =(−2.17±0.03,−2.63±0.06)mas yr−1的绝对固有运动,并边际检测到Sgr B2的视差,这与其他测量结果一致。由H2O脉泽的内部运动特征修正的绝对固有运动表明,Sgr B2复合体位于银河系中心的近侧,并且正在向正星系经度方向移动。通过假设中心分子区(CMZ)的简单圆形轨道,我们估计Sgr B2在Sgr A*前面160±10 pc。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Water maser distributions and their internal motions in the Sagittarius B2 complex
Abstract We conducted a multi-epoch very long baseline interferometry (VLBI) observation of 22 GHz H2O maser sources, which are associated with the Sagittarius B2 (Sgr B2) complex, one of the most active star-forming regions in the Galactic center. Using the VLBI exploration of radio astrometry (VERA) array, we detected 29, 90, and seven maser features in Sgr B2(North), (Main), and (South), respectively. We also discovered two H2O maser features in Sgr B2 (Mid-North). Moreover, we successfully measured spatial distributions and internal motions of the H2O maser sources in Sgr B2(M). We then discovered that the H2O maser features in Sgr B2(M) are located at the outer edge of H ii regions detected by using the centimeter radio continuum emission, and observationally demonstrated that they have outward motions from the two H ii regions separated by 1′. We obtained an absolute proper motion of (μαcos δ, μδ) = (−2.17 ± 0.03, −2.63 ± 0.06) mas yr−1 and marginally detected a parallax of Sgr B2, which is consistent with other measurements. The absolute proper motion corrected by the internal motions of the H2O maser features implies that the Sgr B2 complex is located at the near side of the Galactic center and is moving toward the positive galactic longitude. We estimate that Sgr B2 is at 160 ± 10 pc in front of Sgr A* by assuming a simple circular orbit of the central molecular zone (CMZ).
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来源期刊
Publications of the Astronomical Society of Japan
Publications of the Astronomical Society of Japan 地学天文-天文与天体物理
CiteScore
4.10
自引率
13.00%
发文量
98
审稿时长
4-8 weeks
期刊介绍: Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.
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