论文标题
来自万神殿样品的IA型超新星的弱透镜放大倍率
Weak lensing magnification of Type Ia Supernovae from the Pantheon sample
论文作者
论文摘要
使用Pantheon SN IA汇编和Sloan数字天空调查（SDSS）的数据，我们提出了一个估计器，用于弱透镜收敛，其中包含前景星系的位置和光度数据。这与超新星的哈勃图残差之间的相关性具有$3.6σ$的意义，并且与以星系为中心的暗物质光环造成的弱透镜放大倍率一致。我们还限制了银河光环的特性，例如质量比$γ$和光环物质密度$ρ（r）$的径向轮廓。我们为额外的R.M.S.带来了新的关系镜头引起的大小散布，找到$σ_{\ rm镜头} =（0.06 \ pm 0.017）（d _ {\ rm c}（z）/ d _ {\ rm c}（z = 1）（z = 1）（z = 1）因此，由于镜头的明显大小散射的大小与$ z \ sim 1.2 $的固有散射大小相同。我们建议对SN IA的距离模量估计器进行修改以掺入镜头，这可以轻松地从观测数据中计算出来。我们预计这将提高宇宙学参数估计的准确性。
Using data from the Pantheon SN Ia compilation and the Sloan Digital Sky Survey (SDSS), we propose an estimator for weak lensing convergence incorporating positional and photometric data of foreground galaxies. The correlation between this and the Hubble diagram residuals of the supernovae has $3.6σ$ significance, and is consistent with weak lensing magnification due to dark matter halos centered on galaxies. We additionally constrain the properties of the galactic haloes, such as the mass-to-light ratio $Γ$ and radial profile of the halo matter density $ρ(r)$. We derive a new relationship for the additional r.m.s. scatter in magnitudes caused by lensing, finding $σ_{\rm lens} = (0.06 \pm 0.017) (d_{\rm C}(z)/ d_{\rm C}(z=1))^{3/2}$ where $d_{\rm C}(z)$ is the comoving distance to redshift $z$. Hence the scatter in apparent magnitudes due lensing will be of the same size as the intrinsic scatter of SN Ia by $z \sim 1.2$. We propose a modification of the distance modulus estimator for SN Ia to incorporate lensing, which can be easily calculated from observational data. We anticipate this will improve the accuracy of cosmological parameter estimation for high-redshift SN Ia data.
