Spectroscopy and high-resolution imaging of the gravitational lens SDSS J1206+4332

Spectroscopy and high-resolution imaging of the gravitational lens SDSS J1206+4332
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引力透镜的光谱学和高分辨率成像 SDSS J1206 4332

DOI:
10.1093/mnras/stw529
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发表时间:
2016
影响因子:
4.8
通讯作者:
Agnello A
Agnello A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Agnello A

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我们目前的光谱和激光引导星星自适应光学(LGSAO)的双重成像透镜类星体SDSS J1206+4332的图像。我们修正了以前提出的偏折红移为zd = 0.745,并首次测量了它的速度色散σ =(290 ± 30)km s−1。LGSAO的数据显示,透镜类星体宿主星系在星状焦散面上伸展,从而形成了一对额外的合并图像,这在以前被认为是一个不相关的星系,因为数据有限。由于这种特殊的几何形状,透镜在类星体的宽线区起着天然日冕的作用,因此在褶皱弧中只能看到窄辐射。我们使用的数据来重建源结构和偏转潜力,包括附近的扰动。我们重建点扩散函数(PSF)从类星体图像本身,因为没有额外的点源是在视场中。根据引力透镜效应和恒星动力学,我们发现总质量密度分布的斜率为γ′= −log ρ/logr= 1.93 ± 0.09。我们讨论了SDSS J1206+4332测量时间延迟距离(和thusH 0和其他宇宙学参数)的潜力,或作为一个标准的统治者,结合由COSMOGRAIL合作发布的时间延迟。我们的结论是,该系统是非常有前途的宇宙学。然而,为了实现有竞争力的精度和准确度,需要PSF的独立表征。偏转器的空间解析运动学将进一步减少不确定性。两者都在现有观测设施的范围之内。
We present spectroscopy and laser guide star adaptive optics (LGSAO) images of the doubly imaged lensed quasar SDSS J1206+4332. We revise the deflector redshift proposed previously tozd= 0.745, and measure for the first time its velocity dispersion σ = (290 ± 30) km s−1. The LGSAO data show the lensed quasar host galaxy stretching over the astroid caustic thus forming an extra pair of merging images, which was previously thought to be an unrelated galaxy in seeing limited data. Owing to the peculiar geometry, the lens acts as a natural coronagraph on the broad-line region of the quasar so that only narrowemission is found in the fold arc. We use the data to reconstruct the source structure and deflector potential, including nearby perturbers. We reconstruct the point-spread function (PSF) from the quasar images themselves, since no additional point source is present in the field of view. From gravitational lensing and stellar dynamics, we find the slope of the total mass density profile to be γ′= −log ρ/logr= 1.93 ± 0.09. We discuss the potential of SDSS J1206+4332 for measuring a time-delay distance (and thusH0and other cosmological parameters), or as a standard ruler, in combination with the time-delay published by the COSMOGRAIL collaboration. We conclude that this system is very promising for cosmography. However, in order to achieve competitive precision and accuracy, an independent characterization of the PSF is needed. Spatially resolved kinematics of the deflector would reduce the uncertainties further. Both are within the reach of current observational facilities.
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