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arXiv 2007.07956astro-ph.CO
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从暗能量巡天看Ia型超新星的弱透镜效应

Weak Lensing of Type Ia Supernovae from the Dark Energy Survey

E. Macaulay, D. Bacon, R. C. Nichol, T. M. Davis, J. Elvin-Poole, D. Brout, D. Carollo, K. Glazebrook, S. R. Hinton, G. F. Lewis, C. Lidman, A. Möller, M. Sako,… 展开作者

E. Macaulay, D. Bacon, R. C. Nichol, T. M. Davis, J. Elvin-Poole, D. Brout, D. Carollo, K. Glazebrook, S. R. Hinton, G. F. Lewis, C. Lidman, A. Möller, M. Sako, D. Scolnic, M. Smith, N. E. Sommer, B. E. Tucker, T. M. C. Abbott, M. Aguena, J. Annis, S. Avila, E. Bertin, S. Bhargava, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, M. Costanzi, L. N. da Costa, S. Desai, H. T. Diehl, P. Doel, B. Flaugher, R. J. Foley, J. García-Bellido, E. Gaztanaga, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, D. L. Hollowood, K. Honscheid, D. Huterer, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, M. A. G. Maia, J. L. Marshall, P. Melchior, F. Menanteau, R. Miquel, A. Palmese, A. A. Plazas, A. K. Romer, A. Roodman, E. Sanchez, V. Scarpine, M. Schubnell, S. Serrano, I. Sevilla-Noarbe, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, T. N. Varga, A. R. Walker, J. Weller

摘要:

我们考虑了弱引力透镜效应对暗能量巡天(DES)第1 ~ 3年196颗光谱证实的Ia型超新星(SNe Ia)观测的影响。我们同时测量角关联函数和弱透镜效应引起的非高斯偏度。这种方法的优点是对Ia超新星的本征色散不敏感。我们将这两种效应的幅度建模为$σ_8$的函数,并找到$σ_8 = 1.2^{+0.9}_{-0.8}$。我们还将我们的方法应用于联合光变曲线分析(JLA)的488 SNe子样本(选择匹配我们用于这项工作的红移范围),并找到$σ_8 = 0.8^{+1.1}_{-0.7}$。DES-SN和来自JLA的大量SNe之间的$σ_8$的可比不确定性突出了DES-SN样品均匀性的益处,以及校准和数据分析的改进。

英文摘要:

We consider the effects of weak gravitational lensing on observations of 196 spectroscopically confirmed Type Ia Supernovae (SNe Ia) from years 1 to 3 of the Dark Energy Survey (DES). We simultaneously measure both the angular correlation function and the non-Gaussian skewness caused by weak lensing. This approach has the advantage of being insensitive to the intrinsic dispersion of SNe Ia magnitudes. We model the amplitude of both effects as a function of $σ_8$, and find $σ_8 = 1.2^{+0.9}_{-0.8}$. We also apply our method to a subsample of 488 SNe from the Joint Light-curve Analysis (JLA) (chosen to match the redshift range we use for this work), and find $σ_8 = 0.8^{+1.1}_{-0.7}$. The comparable uncertainty in $σ_8$ between DES-SN and the larger number of SNe from JLA highlights the benefits of homogeneity of the DES-SN sample, and improvements in the calibration and data analysis.

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