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Mass and wind luminosity of young Galactic open clusters in Gaia DR2⋆
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-06-04 , DOI: 10.1051/0004-6361/202348541 S. Celli , A. Specovius , S. Menchiari , A. Mitchell , G. Morlino
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-06-04 , DOI: 10.1051/0004-6361/202348541 S. Celli , A. Specovius , S. Menchiari , A. Mitchell , G. Morlino
Context. Star clusters constitute a significant part of the stellar population in our Galaxy. The feedback processes they exert on the interstellar medium impact multiple physical processes from the chemical to the dynamical evolution of the Galaxy. In addition, young and massive stellar clusters might act as efficient particle accelerators and contribute to the production of cosmic rays.Aims. We aim at evaluating the wind luminosity driven by the young (< 30 Myr) Galactic open stellar clusters observed by the Gaia space mission. This is crucial for determining the energy channeled into accelerated particles.Methods. To do this, we developed a method relying on the number, magnitude, and line-of-sight extinction of the stars observed per cluster. Assuming that the stellar mass function follows a Kroupa mass distribution and accounting for the maximum stellar mass allowed by the age and mass of the parent cluster, we conservatively estimated the mass and wind luminosity of 387 local clusters within the second data release of Gaia.Results. We compared the results of our computation with recent estimates of young cluster masses. With respect to these, our sample is three times more abundant, particularly above a few thousand solar masses. This is of the utmost relevance for predicting the gamma-ray emission resulting from the interaction of accelerated particles. The cluster wind luminosity distribution we obtained extends up to 3 × 1038 erg s−1. This is a promising feature in terms of potential particle acceleration scenarios.
中文翻译：
盖亚 DR2 年轻银河疏散星团的质量和风光度⋆
语境。星团构成了我们银河系恒星群的重要组成部分。它们对星际介质施加的反馈过程会影响从银河系的化学演化到动力学演化的多种物理过程。此外，年轻和巨大的恒星团可能充当有效的粒子加速器，并有助于宇宙射线的产生。我们的目标是评估盖亚太空任务观测到的年轻（< 30 Myr）银河疏散星团驱动的风光度。这对于确定进入加速粒子的能量至关重要。方法。为此，我们开发了一种方法，该方法依赖于每个星团观测到的恒星的数量、星等和视线消光。假设恒星质量函数遵循克鲁帕质量分布，并考虑母星团年龄和质量所允许的最大恒星质量，我们保守估计了盖亚第二次数据发布中387个本地星团的质量和风光度。结果。我们将计算结果与最近对年轻星团质量的估计进行了比较。就这些而言，我们的样本丰富了三倍，特别是在几千个太阳质量以上。这对于预测加速粒子相互作用产生的伽马射线发射至关重要。我们获得的星团风光度分布扩展到3×10 38 erg s−1. This is a promising feature in terms of potential particle acceleration scenarios.
更新日期：2024-06-04
中文翻译：
盖亚 DR2 年轻银河疏散星团的质量和风光度⋆
语境。星团构成了我们银河系恒星群的重要组成部分。它们对星际介质施加的反馈过程会影响从银河系的化学演化到动力学演化的多种物理过程。此外，年轻和巨大的恒星团可能充当有效的粒子加速器，并有助于宇宙射线的产生。我们的目标是评估盖亚太空任务观测到的年轻（< 30 Myr）银河疏散星团驱动的风光度。这对于确定进入加速粒子的能量至关重要。方法。为此，我们开发了一种方法，该方法依赖于每个星团观测到的恒星的数量、星等和视线消光。假设恒星质量函数遵循克鲁帕质量分布，并考虑母星团年龄和质量所允许的最大恒星质量，我们保守估计了盖亚第二次数据发布中387个本地星团的质量和风光度。结果。我们将计算结果与最近对年轻星团质量的估计进行了比较。就这些而言，我们的样本丰富了三倍，特别是在几千个太阳质量以上。这对于预测加速粒子相互作用产生的伽马射线发射至关重要。我们获得的星团风光度分布扩展到3×10 38 erg s−1. This is a promising feature in terms of potential particle acceleration scenarios.
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