Spectroscopy and high-resolution imaging of the gravitational lens SDSS J1206+4332
Spectroscopy and high-resolution imaging of the gravitational lens SDSS J1206+4332
复制标题
引力透镜的光谱学和高分辨率成像 SDSS J1206 4332
DOI:
10.1093/mnras/stw529
复制
发表时间:
2016
影响因子:
4.8
通讯作者:
Agnello A
中科院分区:
文献类型:
--
作者:
Agnello A
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.
登录
查看更多内容
影响因子:
4.8
作者:
Collett, Thomas E.;Marshall, Philip J.;Blandford, Roger D.
通讯作者:
Blandford, Roger D.
影响因子:
8.7
作者:
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者:
Wright, E. L.
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
I. Burud;J. Hjorth;F. Courbin;J. Cohen;P. Magain;A. Jaunsen;A. A. Kaas;C. Faure;G. Letawe
通讯作者:
G. Letawe
影响因子:
6.5
作者:
P. Schneider;D. Sluse
通讯作者:
D. Sluse
DOI:
--
发表时间:
2005
期刊:
The Astrophysical Journal (未定)(発表予定)
影响因子:
--
作者:
Oguri;Masamune et al.
通讯作者:
Masamune et al.