| 中红移BCG的X射线性质 |
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| 引用本文： | 杨里岚,余恒.中红移BCG的X射线性质[J].北京师范大学学报(自然科学版),2017,53(5):536-541. |
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| 作者姓名： | 杨里岚 余恒 |
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| 作者单位： | 北京师范大学天文系,100875,北京;北京师范大学天文系,100875,北京 |
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| 基金项目： | 国家自然科学基金资助项目，创新群体项目，973项目，高等学校博士学科点专项科研基金新教师类资助课题，中央高校基本科研业务费专项基金 |
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| 摘 要： | 最亮团星系(brightest cluster galaxy, BCG)的X射线起源尚不清楚. 射电喷流与径移主导吸积流(advection-dominated accretion flows, ADAF)是2种主要可能的物理起源机制. 2种模型中是否存在主导模型或模型间是否存在关系并不明确, 而且不是所有BCG都存在X射线辐射. 为探究BCG的X射线性质, 进一步了解X射线物理起源机制, 本文选取钱德拉塞卡X射线望远镜(Chandra X-ray observatory, 简称Chandra) 数据存档红移范围0.2
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| 关 键 词： | 星系团 最亮团星系 孔径测光 |
The X-ray properties of BCG in middle redshift |
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| Institution: | Department of Astronomy,Beijing Normal University,100875,Beijing,China |
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| Abstract: | The origin of X-ray emission in Brightest Cluster Galaxy (BCG) is not clear.Both radio jet model and advection-dominated accretion flows (ADAF) model are possible.It is not clear which model is dominant or whether there is any correlation between these two models.However,not all BCG demonstrate X-ray emission.Therefore,it is important to study X-ray properties of BCG and to elucidate the origin of such X-ray emissions.We therefore considered the redshift bin,0.2＜z＜0.23 and analyzed all 27 clusters (30 BCGs in total) recorded in Chandra archive.According to S/N ≥ 3,6 BCGs showed X-ray emission.No linear correlation was found between flux and luminosity of X-ray and radio.Our work suggests that neither ADAF model nor radio jet model dominates in BCG X-ray emission. |
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| Keywords: | cluster brightest cluster galaxy(BCG) aperture photometry |
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