ALMA imprint of intergalactic dark structures in the gravitational lens SDP.81

被引：28

作者：

Inoue, Kaiki Taro ^{[1
]}

Minezaki, Takeo ^{[2
]}

Matsushita, Satoki ^{[3
]}

Chiba, Masashi ^{[4
]}

机构：

[1] Kinki Univ, Fac Sci & Engn, Higashiosaka, Osaka 5778502, Japan

[2] Univ Tokyo, Sch Sci, Inst Astron, Mitaka, Tokyo 1810015, Japan

[3] Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan

[4] Tohoku Univ, Inst Astron, Aoba Ku, Sendai, Miyagi 9808578, Japan

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 457卷 / 03期

关键词：

galaxies: formation; cosmology: theory; dark matter; FLUX-RATIO ANOMALIES; MATTER SUBSTRUCTURE; PIXELATED RECONSTRUCTION; MASS-DISTRIBUTION; GALAXY; SATELLITES; ORIGIN; LIMITS; PROBE;

D O I：

10.1093/mnras/stw168

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an analysis of the Atacama Large Millimeter/submillimeter Array long baseline science verification data of the gravitational lens system SDP. 81. We fit the positions of the brightest clumps at redshift z = 3.042 and a possible active galactic nucleus component of the lensing galaxy at redshift z = 0.2999 in the band 7 continuum image using a canonical lens model, a singular isothermal ellipsoid plus an external shear. Then, we measure the ratio of fluxes in some apertures at the source plane where the lensed images are inversely mapped. We find that the aperture flux ratios of band 7 continuum image are perturbed by 10-20 per cent with a significance at 2 similar to 3 sigma level. Moreover, we measure the astrometric shifts of multiply lensed images near the caustic using the CO(8-7) line. Using a lens model best fitted to the band 7 continuum image, we reconstruct the source image of the CO(8-7) line by taking linear combination of inverted quadruply lensed images. At the 50th channel (rest-frame velocity 28.6 km s(-1)) of the CO(8-7) line, we find an imprint of astrometric shifts of the order of 0.01 arcsec in the source image. Based on a semi-analytic calculation, we find that the observed anomalous flux ratios and the astrometric shifts can be explained by intergalactic dark structures in the line of sight. A compensated homogeneous spherical clump with a mean surface mass density of the order of 10(8) M(circle dot)h(-1) arcsec(-2) can explain the observed anomaly and astrometric shifts simultaneously.

引用

页码：2936 / 2950

页数：15

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