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arXiv 2209.10552astro-ph.COastro-ph.GA
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SN Ia宿主星系尘埃律分布和质量阶跃的约束:光学和近红外线曲线的分级BayeSN分析

Constraining the SN Ia Host Galaxy Dust Law Distribution and Mass Step: Hierarchical BayeSN Analysis of Optical and Near-Infrared Light Curves

Stephen Thorp, Kaisey S. Mandel

摘要:

利用BayeSN分级概率SED模型分析了卡内基超新星计划中86颗Ia型超新星(SNe Ia)的光学-近红外($BVriYJH$)光变曲线,研究了SNe Ia宿主星系的尘埃律分布以及SNe Ia哈勃残差与宿主星系质量的相关性.我们的贝叶斯分析同时约束质量步骤和灰尘$R_V$人口分布,利用光学近红外颜色信息。我们演示了如何一个简单的分析,其中个人$R_V$值分别为每个SN估计,然后计算这些点估计的样本方差,高估了$R_V$人口方差$σ_R^2$。当忽略超出由于光曲线形状引起的残余固有颜色变化时,这种偏差加剧。相反,$σ_R$的贝叶斯收缩估计更准确,光变曲线的完全分层分析是理想的。对于具有低至中度发红(峰值表观$B-V\leq0.3$)的75 SNe,我们估计了具有群体平均值$μ_R=2.59\pm0.14$和标准差$σ_R=0.62\pm0.16$的$R_V$分布。在中等宿主星系质量($10^{10.57}~\mathrm{M}_\odot$)处分裂这个子样本,得到了低质量和高质量星系之间一致的估计$R_V$分布,分别为$μ_R=2.79\pm0.18$、$σ_R=0.42\pm0.24$和$μ_R=2.35\pm0.27$、$σ_R=0.74\pm0.36$。当估计距离从完整的光学近红外光变曲线,而边缘化的各种形式的尘埃$R_V$分布,一个质量步骤$\gtrsim0.06$马格坚持在哈勃残差中的中位数主机质量。

英文摘要:

We use the BayeSN hierarchical probabilistic SED model to analyse the optical-NIR ($BVriYJH$) light curves of 86 Type Ia supernovae (SNe Ia) from the Carnegie Supernova Project to investigate the SN Ia host galaxy dust law distribution and correlations between SN Ia Hubble residuals and host mass. Our Bayesian analysis simultaneously constrains the mass step and dust $R_V$ population distribution by leveraging optical-NIR colour information. We demonstrate how a simplistic analysis where individual $R_V$ values are first estimated for each SN separately, and then the sample variance of these point estimates is computed, overestimates the $R_V$ population variance $σ_R^2$. This bias is exacerbated when neglecting residual intrinsic colour variation beyond that due to light curve shape. Instead, Bayesian shrinkage estimates of $σ_R$ are more accurate, with fully hierarchical analysis of the light curves being ideal. For the 75 SNe with low-to-moderate reddening (peak apparent $B-V\leq0.3$), we estimate an $R_V$ distribution with population mean $μ_R=2.59\pm0.14$, and standard deviation $σ_R=0.62\pm0.16$. Splitting this subsample at the median host galaxy mass ($10^{10.57}~\mathrm{M}_\odot$) yields consistent estimated $R_V$ distributions between low- and high-mass galaxies, with $μ_R=2.79\pm0.18$, $σ_R=0.42\pm0.24$, and $μ_R=2.35\pm0.27$, $σ_R=0.74\pm0.36$, respectively. When estimating distances from the full optical-NIR light curves while marginalising over various forms of the dust $R_V$ distribution, a mass step of $\gtrsim0.06$ mag persists in the Hubble residuals at the median host mass.

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