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arXiv 1002.1249astro-ph.CO
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超新星遗产巡天(SNLS)中的引力透镜

Gravitational lensing in the Supernova Legacy Survey (SNLS)

T. Kronborg, D. Hardin, J. Guy, P. Astier, C. Balland, S. Basa, R. G. Carlberg, A. Conley, D. Fouchez, I. M. Hook, D. A. Howell, J. Jönsson, R. Pain, K. Pederse… 展开作者

T. Kronborg, D. Hardin, J. Guy, P. Astier, C. Balland, S. Basa, R. G. Carlberg, A. Conley, D. Fouchez, I. M. Hook, D. A. Howell, J. Jönsson, R. Pain, K. Pedersen, K. Perrett, C. J. Pritchet, N. Regnault, J. Rich, M. Sullivan, N. Palanque-Delabrouille, V. Ruhlmann-Kleider

摘要:

观测到的Ia型超新星的亮度受到由沿视线的质量分布引起的引力透镜的影响,这在哈勃图中引入了额外的色散。我们在超新星遗产调查3年数据集中寻找透镜效应的证据。我们研究哈勃图的残差和引力放大率之间的相关性的基础上的前景星系的质量分布的模型。一个深测光目录,光度红移,以及建立质量光度关系。我们发现了一个透镜信号的证据与2.3西格玛的意义。目前的结果受到SNe的数量,它们的红移分布以及哈勃图中其他散射源的限制。将星系群分为红色和蓝色样本对信号检测的意义有积极的影响。另一方面,增加星系表的深度、光度红移的精度或减少质量光度关系中的散射,都没有什么影响。我们表明,对于完整的超新星遗产调查样本(~400光谱确认的Ia型SNe和~200光度确定的Ia型SNe),有80%的概率检测到透镜信号与3西格玛的意义。

英文摘要:

The observed brightness of Type Ia supernovae is affected by gravitational lensing caused by the mass distribution along the line of sight, which introduces an additional dispersion into the Hubble diagram. We look for evidence of lensing in the SuperNova Legacy Survey 3-year data set. We investigate the correlation between the residuals from the Hubble diagram and the gravitational magnification based on a modeling of the mass distribution of foreground galaxies. A deep photometric catalog, photometric redshifts, and well established mass luminosity relations are used. We find evidence of a lensing signal with a 2.3 sigma significance. The current result is limited by the number of SNe, their redshift distribution, and the other sources of scatter in the Hubble diagram. Separating the galaxy population into a red and a blue sample has a positive impact on the significance of the signal detection. On the other hand, increasing the depth of the galaxy catalog, the precision of photometric redshifts or reducing the scatter in the mass luminosity relations have little effect. We show that for the full SuperNova Legacy Survey sample (~400 spectroscopically confirmed Type Ia SNe and ~200 photometrically identified Type Ia SNe), there is an 80% probability of detecting the lensing signal with a 3 sigma significance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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