eROSITA/SRG首次探测共生新星CN Cha的X射线辐射
First X-ray detection of symbiotic nova CN Cha with eROSITA/SRG
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中文总结 AI 辅助
本研究利用eROSITA数据首次探测到共生星CN Cha的X射线辐射，发现其辐射随巡天逐渐增强，光谱特征表明其为β型共生星，并存在可能源于热核燃烧或风碰撞的软成分。
中文摘要 AI 辅助
目的：我们报告了搭载于Spektrum-Roentgen Gamma（Spektr-RG）卫星上的eROSITA（扩展伦琴巡天与成像望远镜阵列）对共生星CN Cha的首次X射线探测。方法：我们分别分析了eRASS2至eRASS5的eROSITA观测数据，以及全部五次巡天的合并eRASS:5数据，以研究CN Cha在整个eRASS期间的X射线光谱和时变特性。结果：尽管CN Cha在首次eROSITA全天巡天（eRASS1）中未被探测到，但在第二次巡天eRASS2中首次被探测到。我们的分析表明，CN Cha的X射线辐射从eRASS2到eRASS5逐渐增强。该源的主要发射能量低于2.4 keV，其X射线光谱使我们将其归类为β型共生星。然而，更详细的分析表明存在一个非常软的成分，其可能源于白矮星表面的热核燃烧，或来自风碰撞。需要额外的X射线观测以更好地理解该源的起源和发射机制。
英文摘要
Aims. We report on the first X-ray detection of the symbiotic star CN Cha with eROSITA (extended Roentgen Survey with an Imaging Telescope Array) onboard Spektrum-Roentgen Gamma (Spektr-RG). Methods. We analyse the eROSITA observations from eRASS2 to eRASS5 individually, as well as the combined eRASS:5 data of all five surveys in order to investigate the X-ray spectral and timing properties of CN Cha throughout the eRASS. Results. Although CN Cha was not detected during the first eROSITA All-Sky Survey (eRASS1), it was detected for the first time in the second eRASS2. Our analysis shows that the X-ray emission of CN Cha gradually increased from eRASS2 to eRASS5. The X-ray spectrum of the source, with the main emission at <2.4 keV, allows us to classify it as a \b{eta}-type symbiotic star. However, a more detailed analysis suggests that there is very soft component, which may originate either from thermonuclear burning on the white dwarf, or from the wind collisions. Additional X-ray observations are required to better understand the origin and emission mechanisms of the source.
发表机构
- Dr. Karl Remeis-Sternwarte, Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg（弗里德里希·亚历山大大学埃尔朗根天体粒子物理中心）
- Astronomical Institute of Charles University（查理大学天文研究所）
- Instituto de Astrofísica de Canarias（加那利群岛天体物理研究所）
- Institut für Astronomie und Astrophysik, Universität Tübingen（蒂宾根大学天文与天体物理研究所）
- Max-Planck-Institut für extraterrestrische Physik（马克斯·普朗克地外物理研究所）
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