重游G29.862-0.0044:在一个可能的年轻恒星物体宽双星系统中,被流出物破坏的射流腔

IF 5.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
S. Paron, N. C. Martinez, M. E. Ortega, D. Mast, A. Petriella, L. Supán, C. Fariña
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引用次数: 0

摘要

目标。几年前,我们研究了巨大的年轻恒星物体(MYSO) G29.862-0.0044 (YSO-G29),这是一个距离6.2千公里远的有趣的恒星形成区域。尽管人们提出了典型的圆盘喷射情景来解释这些观测结果,但它还远远不能下结论。我们想知道观察到的令人困惑的近红外特征是由一个来源产生的,还是由于一个未解决的YSOs系统产生的混乱。揭开这个问题对于更好地理解恒星形成过程非常重要。我们使用来自Gemini-NIFS的近红外观测数据、来自Jansky甚大阵列(JVLA)的射电连续体(10ghz)和来自Atacama大型毫米波阵列(ALMA)的新连续体(1.3 mm)和分子线数据分析了YSO-G29。近红外观测使我们能够探测到YSO-G29中H2 1−0 S(1)和Brγ谱线的发射,这与在高度扰动环境中传播的紫外线辐射的激发和电离是相容的。此外,我们还发现了一些碰撞激发H2的证据。ALMA数据显示,存在一个向南传播的明显的准直分子外流,而向北,一个扩展的分子特征被Ks近红外发射完全包围。1.3 mm的连续辐射使我们能够更好地解析分子核,其中一个分子核因其高温和丰富的化学成分而脱颖而出。从JVLA的观测中,我们发现了一个紧凑的射电连续源,可能是一个紧凑的HII区域,或者是一个大质量原恒星的电离射流,位于~0。″7 (~0.02 pc)从主毫米芯。通过这种方法,我们提出了一个YSO宽双星系统。我们可以解释之前观察到的有趣的近红外特征的本质:双星系统中一个组成部分的射流或风产生的圆锥形结构清除了周围的环境,被可能来自另一个组成部分的分子流出破坏了。这些结果完整地描绘了YSO-G29中正在发生的事情,并揭示了在研究大质量恒星形成区域时应该考虑的现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Revisiting G29.862–0.0044: A jet cavity disrupted by an outflow in a likely young stellar object wide binary system
Aims. A few years ago, we investigated the massive young stellar object (MYSO) G29.862–0.0044 (YSO-G29), an intriguing star-forming region at a distance of 6.2 kpc. Although the typical disc-jet scenario was proposed to explain the observations, it remained far from conclusive. We wonder if the puzzling observed near-IR features are produced by only one source or if it is due to confusion generated by an unresolved system of YSOs. Unveiling this issue is important for a better understanding of the star-forming processes.Methods. We analysed YSO-G29 using new observations in the near-IR from Gemini-NIFS, at the radio continuum (10 GHz) from the Jansky Very Large Array (JVLA) and new continuum (1.3 mm) and molecular line data from the Atacama Large Millimeter Array (ALMA).Results. The near-IR observations allowed us to detect emission of H2 1−0 S(1) and Brγ lines in YSO-G29, which are compatible with excitation and ionisation from UV radiation propagating in a highly perturbed ambient. In addition, we also found some evidence of H2 excitation by collisions. The ALMA data show the presence of a conspicuous and collimated molecular outflow propagating southwards, while to the north, an extended molecular feature perfectly surrounded by the Ks near-IR emission appears. The continuum emission at 1.3 mm allowed us to better resolve the molecular cores, one of which stands out due to its high temperatures and rich chemical composition. From the JVLA observations, we discovered a compact radio continuum source, a likely compact HII region or an ionised jet of a massive protostar, located at ~0.″7 (~0.02 pc) from the main millimetre core. In this way, we propose a YSO wide binary system.Conclusions. We can explain the nature of the intriguing near-IR features previously observed: Cone-like structures produced by jets or winds of one of the components of the binary system that cleared out the surroundings were disrupted by a molecular outflow probably from the other component. These results complete the picture of what is happening in YSO-G29 and reveal a phenomenon that should be considered when investigating massive star-forming regions.
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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