Integral field spectroscopy of four lensed quasars: analysis of their neighborhood and evidence for microlensing
Integral field spectroscopy of four lensed quasars: analysis of their neighborhood and evidence for microlensing
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DOI：
10.1051/0004-6361:20077306
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发表时间：
2008-02
影响因子：
6.5
通讯作者：
T. Anguita;C. Faure;A. Yonehara;J. Wambsganss;J. Kneib;G. Covone;D. A. A. F. Astronomie-D.-A.-A.-F.-Astronomie-102469653;U. Heidelberg;Jsps Fellowships for Research Abroad;Laboratoire d'Astrophysique de Marseille;-INAF;Naples;Aim;7. CEADSM-CNRS-UniversiteParis
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文献类型：
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作者：
T. Anguita;C. Faure;A. Yonehara;J. Wambsganss;J. Kneib;G. Covone;D. A. A. F. Astronomie-D.-A.-A.-F.-Astronomie-102469653;U. Heidelberg;Jsps Fellowships for Research Abroad;Laboratoire d'Astrophysique de Marseille;-INAF;Naples;Aim;7. CEADSM-CNRS-UniversiteParis
上下文引力透镜类星体构成了一个独立的工具，通过它们不同图像的时间延迟来推导哈勃常数;它们也提供了研究透镜星系的质量分布和星际介质的机会，并且通过透镜星系中恒星的微透镜，它们还允许研究发射源的细节。目标。对于这样的研究，人们需要有一个很好的知识的透镜图像的封闭环境，以模拟透镜的潜力：这意味着，理想情况下，观测数据在一个大的视场和光谱在高空间分辨率。方法.利用VIMOS对HE 0230-2130、RXJ0911.4 + 0551、H1413 + 117和B 1359 + 154四个透镜类星体进行了27 × 27视场的积分观测.利用低、中、高分辨率模式研究了类星体图像和类星体环境。由于积分场数据集约简的复杂性，我们提供了数据约简的详细报告。结果不同图像的类星体光谱之间的比较揭示了HE 0230-2130，RX J0911.4 + 0551和H 1413+117的差异：当在发射线和连续谱中测量时，同一类星体图像之间的通量比是不同的。我们还测量了HE 0230-2130和RX J0911.4 + 0551附近星系的红移，考虑到它们非常接近类星体的视线，这可能有助于总的透镜势。结论.仔细的分析表明，微透镜是最自然的解释（去）放大率的连续发射区的背景源。在HE 0230-2130中，图像D可能受到微透镜放大的影响;在RX J0911.4+0551中，图像A1和A3可能受到微透镜缩小的影响，在H 1413+117中，至少图像Di受到微透镜的影响。我们还没有能够恢复任何微透镜信息或在B 1359+154附近的视线附近的星系。
Context. Gravitationally lensed quasars constitute an independent tool to derive the Hubble constant through the time-delays of their different images; they offer as well the opportunity to study the mass distribution and interstellar medium of their lensing galaxies and, through microlensing due to stars in their lensing galaxy, they also allow one to study details of the emitting source. Aims. For such studies, one needs to have an excellent knowledge of the close environment of the lensed images in order to model the lensing potential: this means, ideally, observational data over a large field-of-view and spectroscopy at high spatial resolution. Methods. We present VIMOS integral field observations of 27 �� × 27 �� fields of view around four lensed quasars: HE 0230-2130, RX J0911.4 + 0551, H 1413 + 117 and B 1359 + 154. Using the low, medium and high resolution modes, we study the quasar images and the quasar environments. Because of the complexity of the reduction of integral field datasets, we provide a detailed report of the data reduction. Results. Comparison between the quasar spectra of the different images reveals differences for HE 0230–2130, RX J0911.4 + 0551 and H 1413+117: flux ratios between the images of the same quasar are different when measured in the emission lines and in the continuum. We have also measured the redshifts of galaxies in the neighborhood of HE 0230–2130 and RX J0911.4 + 0551 which possibly contribute to the total lensing potential, given their close proximity to the line-of-sight toward the quasars. Conclusions. A careful analysis reveals that microlensing is the most natural explanation for the (de)magnification of the continuum emitting region of the background sources. In HE 0230-2130, image D is likely to be affected by microlensing magnification; in RX J0911.4+0551, images A1 and A3 are likely to be modified by microlensing de-magnification and in H 1413+117 at least image Di s affected by microlensing. We have not been able to recover any microlensing information or galaxies close to the line-of-sight in the neighborhood of B 1359+154.