Strange magnification pattern in the large separation lens SDSS J1004+4112 from optical to X-rays
Strange magnification pattern in the large separation lens SDSS J1004+4112 from optical to X-rays
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大分离镜头 SDSS J1004 4112 从光学到 X 射线的奇怪放大模式
DOI：
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发表时间：
2006
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通讯作者：
Lise Christensen
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作者：
G. Lamer;A. Schwope;L. Wisotzki;Lise Christensen
我们提出了同时XMM牛顿紫外和X射线观测的四重透镜类星体SDSS J1004+4112（RBS 825）。在进行XMM-牛顿观测的同时，我们还使用卡拉尔阿尔托PMAS摄谱仪对两个最近的透镜图像A和B进行了积分场光谱分析。在X射线中，宽间隔的分量C和D被清楚地分辨，而在XMM-EPIC图像中，较近的一对图像A和B被边缘地分辨。自1990年ROSAT全天巡天观测以来，该系统的X射线积分通量下降了6倍，而X射线谱变得更硬，幂律指数从$Gamma=-2.3$发展到$Gamma=-1.86$。通过对透镜类星体的X射线图像进行解混，我们发现透镜图像A和B之间的X射线通量比与同时获得的紫外光通量比和先前测量的光通量比有很大的不同。我们的透镜图像A的光谱显示了蓝色发射线翼的增强，这在以前的时代中作为瞬态特征被观察到。我们提出了一个方案，其中固有的紫外线和X射线的变化引起的线的变化，选择性地放大图像A中的微透镜。在EPIC图像中清晰地观测到了透镜星系团的扩展发射，我们测量到0.5- 2.0keV的亮度为1.4 $ 10美元^{44}~{
m erg/s}$。根据星团的X射线性质，我们估计质量为2 {-}6$ $ 大约$$10 ^{14}~M_odot$。
We present simultaneous XMM-Newton UV and X-ray observations of the quadruply lensed quasar SDSS J1004+4112 (RBS 825). Simultaneously with the XMM-Newton observations we also performed integral field spectroscopy on the two closest lens images A and B using the Calar Alto PMAS spectrograph. In X-rays the widely spaced components C and D are clearly resolved, while the closer pair of images A and B is marginally resolved in the XMM-EPIC images. The integrated X-ray flux of the system has decreased by a factor of 6 since it was observed in the ROSAT All Sky Survey in 1990, while the X-ray spectrum became much harder with the power law index evolving from $Gamma=-2.3$ to $Gamma=-1.86$. By deblending the X-ray images of the lensed QSO we find that the X-ray flux ratios between the lens images A and B are significantly different from the simultaneously obtained UV ratios and previously measured optical flux ratios. Our optical spectrum of lens image A shows an enhancement in the blue emission line wings, which has been observed in previous epochs as a transient feature. We propose a scenario where intrinsic UV and X-ray variability gives rise to line variations which are selectively magnified in image A by microlensing. The extended emission of the lensing cluster of galaxies is clearly detected in the EPIC images, we measure a 0.5–2.0 keV luminosity of 1.4 $ imes$ $10^{44}~{
m erg/s}$. Based on the cluster X-ray properties, we estimate a mass of $2{-}6$ $ imes$ $10^{14}~M_odot$.