发表机构
Space Sciences, Technologies and Astrophysics Research (STAR) Institute, University of Liège; Instituto Argentino de Radioastronomia (CONICET; CICPBA; UNLP); Indian Institute of Space Science and Technology（列日大学空间科学、技术与天体物理研究（STAR）研究所; 阿根廷射电天文研究所; 印度空间科学与技术学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用MeerKAT巡天数据对银河系平面428颗WR恒星进行射电普查，探测到23个源并识别出12个潜在的新碰撞风双星候选体，为理解大质量恒星非热辐射提供了最全面的星表。
AI 中文摘要
包括Wolf-Rayet恒星在内的大质量恒星主要存在于双星系统中。已知这些系统既发射来自恒星风的热辐射，偶尔也发射由风-风相互作用区域中加速的相对论电子产生的非热辐射。我们旨在利用SARAO MeerKAT银河系平面巡天（SMGPS）并辅以MeerKAT银河系中心巡天，提供银河系平面内WR恒星射电辐射最完整的普查。我们的主要动机是识别指示粒子加速碰撞风双星（PACWBs）的同步加速射电辐射的迹象。我们编制了一个包含428颗WR恒星的位置覆盖SMGPS和MGCS的输入星表。利用巡天数据，我们测量了探测到的WR恒星在1.3 GHz的射电辐射。我们还为位于足够低射电背景区域的源测量了上限。对于探测到的源，我们通过将测量通量与两种不同的大质量恒星风热辐射评估器进行比较来搜寻射电超出。我们探测到23个目标，并确定了279颗WR恒星的上限。在探测到的源中，15个显示出（显著或潜在的）射电超出，这些超出无法用任何类型的未分辨星周发射来解释。在移除已知的PACWBs后，我们报告识别出12个潜在的新PACWB候选体。我们的研究基于覆盖银河系平面的均匀数据集，编制了迄今为止最广泛的银河系WR射电辐射星表。低探测率表明要么同步加速发射的发生率较低，要么受到明显由WR风物质的自由-自由吸收主导的翻转过程的显著衰减。我们的结果为旨在确定所识别射电超出性质的专项后续观测打开了大门。
英文摘要
Massive stars, including Wolf-Rayet stars, are predominantly found in binary systems. These systems are known to emit both thermal emission from stellar winds and, occasionally, non-thermal emission produced by relativistic electrons accelerated in the wind-wind interaction region. We intend to provide the most complete census of radio emission from WR stars in the Galactic plane, using the SARAO MeerKAT Galactic Plane Survey (SMGPS) complemented by the MeerKAT Galactic Center Survey. Our main motivation is to identify hints of synchrotron radio emission indicative of particle-accelerating colliding-wind binaries (PACWBs). We compiled an input catalogue of 428 WR stars positionally covered by the SMGPS and the MGCS. Using the survey data, we measured the radio emission at 1.3 GHz for detected WR stars. We also measured the upper limits for objects located in sufficiently low radio background regions. For detected objects, we searched for a radio excess by comparing the measured fluxes to two different evaluators of the thermal emission from massive star winds. We detected 23 targets and determined the upper limits for 279 WR stars. Among the detected objects, 15 display a (significant or potential) radio excess that cannot be explained by unresolved circumstellar emission of any kind. After removing already known PACWBs, we report the identification of 12 potential new PACWB candidates. Our study has led to the compilation of the most extensive catalogue of Galactic WR radio emission to date, based on a homogeneous dataset covering the Galactic plane. The low detection rate indicates either a low occurrence rate of synchrotron emission or substantial attenuation by turnover processes that are clearly dominated by free-free absorption from the WR wind material. Our results open the door to dedicated follow-up observations aimed at ascertaining the nature of the identified radio excesses.
CommentsThe full version of Table 1 is available at the CDS via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/713/A154
Journal refTasseroul, M., De Becker, M., Benaglia, P., & Tej, A. (2026), A&A, 713, A154
DOI：10.1051/0004-6361/202660594
