X3: A High-mass Young Stellar Object Close to the Supermassive Black Hole Sgr A*
X3: A High-mass Young Stellar Object Close to the Supermassive Black Hole Sgr A*
复制标题
DOI：
10.3847/1538-4357/aca977
复制
发表时间：
2023-02
期刊：
影响因子：
--
通讯作者：
F. Peißker;M. Zajaček;N. Sabha;M. Tsuboi;J. Moultaka;L. Labadie;A. Eckart;V. Karas;L. Steiniger
中科院分区：
文献类型：
--
作者：
F. Peißker;M. Zajaček;N. Sabha;M. Tsuboi;J. Moultaka;L. Labadie;A. Eckart;V. Karas;L. Steiniger
迄今为止，对银河系中心年轻恒星物体（YSO）的拟议观测仍然提出了这样的问题：由于人马座 A* 的剧烈运动，这些物体可能在何处以及如何形成。在这里，我们报告了对靠近 Sgr A* 的高度动态 YSO 的多波长检测，该 YSO 可能是 IRS 13 星团的成员。我们使用 SINFONI (VLT)、NACO (VLT)、ISAAC (VLT)、VISIR (VLT)、SHARP (NTT) 和 NIRCAM2 (KECK) 在近红外和中红外 (NIR/MIR) 中观察先前已知的无芯弓激波源 X3。在射电领域，我们使用 CO 连续谱和 H30α ALMA 观测来识别与中心恒星源相关的不同温度和位置的系统组件。有人认为，这些射电/亚毫米波观测与 NIR Brγ 线相结合，可能与 YSO 的原行星盘有关，这与多种 VISIR 观测结果一致，这些观测结果揭示了稠密区域中的复杂分子和元素，如 PAH、S iv、Ne ii 和 Ar iii。基于光度多波长分析，我们推断YSO的质量为15−5+10M⊙，相关年龄为104年左右。由于这一年龄估计和大质量恒星所需的弛豫时间尺度，这一发现表明内部秒差距正在进行恒星形成。自行和 3D 距离暗示了 X3 和 IRS 13 之间的关系。我们认为 IRS 13 可能是由于星团蒸发而被喷射的年轻恒星的诞生地。
To date, the proposed observation of young stellar objects (YSOs) in the Galactic center still raises the question of where and how these objects could have formed due to the violent vicinity of Sgr A*. Here, we report the multiwavelength detection of a highly dynamic YSO close to Sgr A* that might be a member of the IRS 13 cluster. We observe the beforehand known coreless bow-shock source X3 in the near- and mid-infrared (NIR/MIR) with SINFONI (VLT), NACO (VLT), ISAAC (VLT), VISIR (VLT), SHARP (NTT), and NIRCAM2 (KECK). In the radio domain, we use CO continuum and H30α ALMA observations to identify system components at different temperatures and locations concerning the central stellar source. It is suggested that these radio/submillimeter observations in combination with the NIR Brγ line can be associated with a protoplanetary disk of the YSO, which is consistent with manifold VISIR observations that reveal complex molecules and elements such as PAH, S iv, Ne ii, and Ar iii in a dense and compact region. Based on the photometric multiwavelength analysis, we infer the mass of 15−5+10M⊙ for the YSO with a related age of a few 104 yr. Due to this age estimate and the required relaxation timescales for high-mass stars, this finding is an indication of ongoing star formation in the inner parsec. The proper motion and 3D distance imply a relation between X3 and IRS 13. We argue that IRS 13 may serve as a birthplace for young stars that are ejected due to the evaporation of the cluster.