HST and ground-based observations of the gravitational lens system Q1009-0252 A & B
HST and ground-based observations of the gravitational lens system Q1009-0252 A & B
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DOI：
10.1051/0004-6361:20000491
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发表时间：
2001-03
影响因子：
6.5
通讯作者：
J. Claeskens;S. Khmil;Dong Wook Lee;D. Sluse;J. Surdej
中科院分区：
文献类型：
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作者：
J. Claeskens;S. Khmil;Dong Wook Lee;D. Sluse;J. Surdej
。本文对Q1009-0252A&B(=LBQS1009-0252A&B)双成像类星体的直接成像和光谱进行了批判性研究。首先，我们报告了用哈勃太空望远镜(HST)上的WFPC2进行的新观测，其中非常清楚地探测到了透镜星系。我们将这些与现有的NICMOS观测相结合，以表征透镜的性质和红移。我们的HST观测也使用了简单的解析透镜模型(CID：12)，得到了透镜星系的预期时延和M/L的估计。其次，使用新的和现有的地面观测，以建立(CID：12)第一个多色透镜组分的光曲线。尽管时间分辨率较低，但可以检测到两个组件的flUX变异性。最后，Surdej等人发表的地面光谱观测。(1993)，用一种新的方法重新处理，该方法旨在以小角度间隔提取光谱。根据一个包括宏观和微观透镜放大(CID：12)阳离子和尘埃消光的简单模型分析了(CID：12)NaL光谱。一般{引力透镜{类星体：个体：Q1009-0252 A&B
. In this paper, we propose a critical study of direct images and spectra obtained for the doubly imaged QSO Q1009-0252 A & B (=LBQS1009-0252 A & B). First, we report new observations with the WFPC2 onboard the Hubble Space Telescope (HST), in which the lensing galaxy is very clearly detected. We combine these with existing NICMOS observations in order to characterize the nature and redshift of the lens. Our HST observations are also (cid:12)tted with simple analytical lens models; estimates expected for the time delay and M/L of the lensing galaxy are derived. Secondly, new and existing ground-based observations are used in order to establish the (cid:12)rst multicolour lightcurves of the lensed components. Although the time resolution is low, flux variability is detected for both components. Finally, ground-based spectroscopic observations published by Surdej et al. (1993) are re-processed with a new method designed to extract spectra with small angular separations. The (cid:12)nal spectra are analysed on the basis of a simple model including macrolensing and microlensing ampli(cid:12)cations and dust extinction. general { gravitational lensing { quasars: individual: Q1009-0252 A & B