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arXiv 2102.08980astro-ph.GAastro-ph.CO
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Ia型超新星主偏置对观测或拟合技术的依赖性

The Dependence of the Type Ia Supernova Host Bias on Observation or Fitting Technique

Jared Hand, Shu Liu, Lluís Galbany, Daniel Perrefort, W. M. Wood-Vasey, Chris Burns

摘要:

更明亮的Ia型超新星(SNe Ia)更喜欢质量较小的宿主和更高的恒星形成区域。在宽度-颜色-光度光变曲线标准化过程中,这种相关性被反转,导致距离测量相对于主机属性的阶跃式偏差。使用PISCO超新星宿主样本和SDSS,GALEX和2 MASS测光,我们比较了不同观测方法的宿主恒星质量和特定恒星形成率(sSFR),包括本地与全球,以及拟合技术来测量它们对宿主阶跃偏差的影响。我们所有质量样品的质量阶跃测量值在-0.03 $\pm$ 0.02 mag至-0.04 $\pm$ 0.02 mag的1 $σ$显著性范围内一致。包括或排除UV信息对测量的质量阶跃大小或位置没有影响。特定SFR(sSFR)步长比质量步长测量更显著,并且对于51宿主样品,其从$0.05\pm0.03$ mag(H $α$)和$0.06\pm0.02$ mag(UV)变化。的sSFR步骤位置的影响,用于标准化恒星形成的质量样本和sSFR示踪剂的选择。当使用所有可用的73个主机进行H $α$测量时,步长减小至0.04 $\pm$ 0.03 mag。这73个PISCO主机子样本总体上缺乏明确的阶跃信号,但在此我们正在寻找质量或sSFR估计的不同选择是否可以产生阶跃信号。我们没有发现任何证据表明,不同的观察或拟合技术的选择可以创建一个距离测量步骤,无论是质量或sSFR。

英文摘要:

More luminous Type Ia supernovae (SNe Ia) prefer less massive hosts and regions of higher star formation. This correlation is inverted during width-color-luminosity light curve standardization resulting in step-like biases of distance measurements with respect to host properties. Using the PISCO supernova host sample and SDSS, GALEX, and 2MASS photometry, we compare host stellar mass and specific star formation rate (sSFR) from different observation methods, including local vs. global, and fitting techniques to measure their impact on the host step biases. Mass step measurements for all our mass samples are consistent within a 1$σ$ significance from -0.03$\pm$0.02 mag to -0.04$\pm$0.02 mag. Including or excluding UV information had no effect on measured mass step size or location. Specific SFR (sSFR) step sizes are more significant than mass step measurements and varied from $0.05\pm0.03$ mag (H$α$) and $0.06\pm0.02$ mag (UV) for a 51 host sample. The sSFR step location is influenced by mass sample used to normalize star formation and by sSFR tracer choice. The step size is reduced to 0.04$\pm$0.03 mag when using all available 73 hosts with H$α$ measurements. This 73 PISCO host subsample overall lacked a clear step signal, but here we are searching for whether different choices of mass or sSFR estimation can create a step signal. We find no evidence that different observation or fitting techniques choice can create a distance measurement step in either mass or sSFR.

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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