The Lens Redshift and Galaxy Environment for HE 0435−1223
The Lens Redshift and Galaxy Environment for HE 0435−1223
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HE 0435−1223 的镜头红移和星系环境
DOI：
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发表时间：
2004
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通讯作者：
M. I. O. Technology
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作者：
N. Morgan;C. Kochanek;O. Pevunova;P. L. S. O. S. University;Ipac;C. I. O. Technology.;M. I. O. Technology
星系透镜HE 0435-1223的红移为0.4546 ± 0.0002，这是根据麦哲伦联盟6.5米克莱望远镜上的低色散巡天摄谱仪2获得的观测结果。哈勃太空望远镜高级巡天照相机对该系统的观测还揭示了一个由10个星系组成的螺旋星系群，位于椭圆透镜星系的40英寸范围内。其中两个星系的红移被测量为相对于透镜处于前景（z = 0.419）;因此，至少有一些邻近的星系与透镜不属于同一个物理群。考虑了局部星系环境的系统质量模型（假设同平面偏转器）比单晕模型更好地解释了观测到的发射线通量比（可能不受微透镜的影响），但匹配仍然不是完美的。特别地，观察到分量A（光传播时间的最小值）比预测的亮0.20 mag，并且观察到分量C（也是最小图像）比预测的暗0.16 mag。A-D时间延迟预计为15.8或17.6天（H 0 = 72 km s-1 Mpc-1），这取决于当地星系环境的细节。
The redshift of the galaxy lensing HE 0435-1223 is 0.4546 ± 0.0002, based on observations obtained with the Low Dispersion Survey Spectrograph 2 on the Magellan Consortium's 6.5 m Clay Telescope. Hubble Space Telescope Advanced Camera for Surveys observations of the system also reveal a spiral-rich group of 10 galaxies within 40″ of the elliptical lensing galaxy. The redshifts for two of these galaxies were measured to be in the foreground (at z = 0.419) with respect to the lens; thus, at least some of the nearby galaxies are not part of the same physical group as the lens. Mass models of the system (assuming same-plane deflectors) that take the local galaxy environment into account do better at explaining the observed emission-line flux ratios (which are presumably unaffected by microlensing) than single-halo models, but the match is still not perfect. In particular, component A (a minimum of the light travel time) is observed to be 0.20 mag brighter than predicted, and component C (also a minimum image) is observed to be 0.16 mag fainter than predicted. The A - D time delay is predicted to be either 15.8 or 17.6 days (H0 = 72 km s-1 Mpc-1), depending on the details of the local galaxy environment.