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arXiv 1202.1645astro-ph.CO
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最大类星体透镜的钱德拉视图SDSS J1029 +2623

The Chandra view of the Largest Quasar Lens SDSS J1029+2623

Naomi Ota, Masamune Oguri, Xinyu Dai, Christopher S. Kochanek, Gordon T. Richards, Eran O. Ofek, Roger D. Blandford, Tim Schrabback, Naohisa Inada

摘要:

本文给出了Chandra对z_l=0.58的星团透镜SDSS J1029+2623的观测结果,它是一个具有最大像间距的引力透镜类星体。我们清楚地检测到X射线发射的透镜集群和三个透镜类星体的图像。该星系团的X射线温度为kT = 8.1(+2.0,-1.2)keV,测热光度L_X = 9.6e44 erg s^-1。它的表面亮度集中在最亮的星系团之一附近,并且东西向拉长。我们确定了主峰西北方向的一个次峰,这表明正在进行合并。即便如此,从流体静力平衡假设推断出的X射线质量似乎与系统爱因斯坦半径的透镜质量一致。我们发现在最暗类星体图像的软X射线光谱中有显著的吸收,这可能是由透镜或源红移处的介入材料引起的。类星体图像之间的X射线通量比(在校正吸收后)与光学和无线电波长的X射线通量比相当一致,所有的通量比都与简单质量模型预测的不一致。这表明微透镜效应对该系统的影响并不显著,暗物质亚结构是导致异常通量比的主要原因。

英文摘要:

We present results from Chandra observations of the cluster lens SDSS J1029+2623 at z_l=0.58, which is a gravitationally lensed quasar with the largest known image separation. We clearly detect X-ray emission both from the lensing cluster and the three lensed quasar images. The cluster has an X-ray temperature of kT = 8.1 (+2.0, -1.2) keV and bolometric luminosity of L_X = 9.6e44 erg s^-1. Its surface brightness is centered near one of the brightest cluster galaxies, and it is elongated East-West. We identify a subpeak North-West of the main peak, which is suggestive of an ongoing merger. Even so, the X-ray mass inferred from the hydrostatic equilibrium assumption appears to be consistent with the lensing mass from the Einstein radius of the system. We find significant absorption in the soft X-ray spectrum of the faintest quasar image, which can be caused by an intervening material at either the lens or source redshift. The X-ray flux ratios between the quasar images (after correcting for absorption) are in reasonable agreement with those at optical and radio wavelengths, and all the flux ratios are inconsistent with those predicted by simple mass models. This implies that microlensing effect is not significant for this system and dark matter substructure is mainly responsible for the anomalous flux ratios.

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