宿主星系形态对Ia型超新星标准化及宇宙学分析的影响

Anastasia Yurevna Baluta, M. Pruzhinskaya, P. Rosnet, N. Pauna
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引用次数: 0

摘要

Ia型超新星(SNe Ia)被认为是宇宙中很好的距离指示器。由于SN光曲线参数与光度之间的经验关系,这成为可能。然而,哈勃图仍然显示了一些剩余的本征色散,这可能与超新星环境的影响有关。在这项工作中,我们研究了宿主星系的形态如何影响超新星Ia的标准化和宇宙学分析。我们复制了Pantheon哈勃图拟合,并根据其宿主星系的形态类型分别对两个SN群进行了拟合:早型和晚型。我们发现,在被动恒星环境下,snia的超新星比由晚型星系承载的超新星具有更高的时延和更小的时延标准化参数。经过拉伸和颜色校正后,早期类型的星系包含更明亮的超新星。因此,宿主形态校正确实会影响哈勃图的拟合。我们还注意到,单独的主机质量校正不足以考虑环境的影响。在Ia型超新星光度中观测到的本禀散射仍然可以通过更正确地考虑环境校正来部分补偿。多面宇宙:理论与观测
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The influence of host galaxy morphology on Type Ia Supernovae standardization and cosmological analysis
Type Ia Supernovae (SNe Ia) are known to be good distance indicators in the Universe. It becomes possible thanks to the empirical relation between SN light curve parameters and luminosity. However, the Hubble diagram still shows some remaining intrinsic dispersion, which can be related to the effect of supernova environment. In this work we study how the host galaxy morphology affects SN Ia standardization and cosmological analysis using 330 supernovae from the Pantheon cosmological sample. We reproduce the Pantheon Hubble diagram fit and perform the fit separately for two SN groups according to the morphological type of their host galaxies: early-type and late-type. We found that in passive stellar environment SNe Ia have higher 𝛼 and smaller 𝛽 standardization parameters than supernovae hosted by late-type galaxies. The early-type galaxies contain brighter supernovae after stretch and colour corrections. Thus, the host morphology correction do affect the Hubble diagram fit. We also notice that the host mass correction alone is not enough to take the influence of the environment into account. The observed intrinsic scatter in SNe Ia luminosity can still be partially compensated by a more correct consideration of the environmental correction. The Multifaceted Universe: Theory and Observations
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