Time delay and lens redshift for the doubly imaged BAL quasar SBS 1520+530 ?;??

Time delay and lens redshift for the doubly imaged BAL quasar SBS 1520+530 ?;??
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双成像 BAL 类星体 SBS 1520 530 的时间延迟和透镜红移 ??;??

DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
G. Letawe
G. Letawe
中科院分区:
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文献类型:
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作者:
I. Burud;J. Hjorth;F. Courbin;J. Cohen;P. Magain;A. Jaunsen;A. A. Kaas;C. Faure;G. Letawe

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我们展示了从北欧光学望远镜获得的数据得出的引力透镜类星体 SBS 1520+530 的光学 R 波段光变曲线。根据光变曲线确定 130 ± 3 天 (1σ) 的时间延迟。此外,凯克天文台获得的 SBS 1520+530 的光谱经过空间去卷积,以提取微弱透镜星系的光谱,不受明亮类星体图像的光的任何污染。该光谱表明透镜红移 z = 0.717,与类星体光谱中发现的吸收系统之一一致。该系统的最佳质量模型包括除主透镜星系之外的第二个附近星系和星系团。采用该模型和 Ω = 0.3、Λ = 0.7 宇宙学,我们的时延测量产生哈勃常数 H_0 = 51 ± 9 km s^(-1) Mpc^(-1)(1σ 误差)。
We present optical R-band light curves of the gravitationally lensed quasar SBS 1520+530 derived from data obtained at the Nordic Optical Telescope. A time delay of 130 ± 3 days (1σ) is determined from the light curves. In addition, spectra of SBS 1520+530 obtained at the Keck Observatory are spatially deconvolved in order to extract the spectrum of the faint lensing galaxy, free of any contamination by the light from the bright quasar images. This spectrum indicates a lens redshift z = 0.717, in agreement with one of the absorption systems found in the quasar spectra. The best mass model of the system includes a second nearby galaxy and a cluster of galaxies in addition to the main lensing galaxy. Adopting this model and an Ω = 0.3, Λ = 0.7 cosmology, our time-delay measurement yields a Hubble constant of H_0 = 51 ± 9 km s^(-1) Mpc^(-1) (1σ error).