Pantheon+ 样本中哈勃常数局部各向异性的稳健评估

IF 1.9 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Yves-Henri Sanejouand
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引用次数: 0

摘要

由普朗克合作组织参数化的ΛCDM 的震级预测与整个 Pantheon+ 样本的 Ia 超新星数据并不一致,即使为了考虑其值的不确定性而调整了哈勃常数。这可能是 Pantheon+ 样本中低红移超新星的数量比以前的此类样本有所增加的结果。为了在天空中找到哈勃流平静的方向,也就是模型预测与低红移和高红移超新星数据都一致的方向,我们将几个模型的预测星等与Pantheon+样本中超新星的校正B波段星等进行了比较。当忽略红移低于0.035的超新星时,H0=73.4 km⋅s-1⋅Mpc-1, ΛCDM的预测与Pantheon+的数据变得一致。如果把大致以 CMB 偶极子方向为中心的低红移超新星子集与高红移超新星子集放在一起考虑,至少在考虑到 CMB 和奇特速度对红移的修正时,情况也是如此。这些结果似乎很可靠,因为它们也是用简单的单参数累光模型得到的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A robust assessment of the local anisotropy of the Hubble constant in the Pantheon+ sample
Magnitude predictions of ΛCDM, as parametrized by the Planck collaboration, are not consistent with the supernova Ia data of the whole Pantheon+ sample even when, in order to take into account the uncertainty about its value, the Hubble constant is adjusted. This is a likely consequence of the increase of the number of low-redshift supernovae in the Pantheon+ sample, with respect to previous such samples.
In order to find directions in the sky where the Hubble flow is quiet, that is, where model predictions are consistent with both low and high-redshift supernova data, predicted magnitudes of several models were compared to the corrected B band magnitudes of the supernovae of the Pantheon+ sample.
When supernovae at redshifts below 0.035 are ignored, with H0=73.4 kms1Mpc−1, ΛCDM predictions become consistent with Pantheon+ data. This is also the case when subsets of low-redshift supernovae roughly centered on the direction of the CMB dipole are considered, together with high-redshift ones, at least when CMB and peculiar velocities corrections are taken into account for the redshifts. These results seem robust, since they are also obtained with a simple, single-parameter tired-light model.
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来源期刊
New Astronomy
New Astronomy 地学天文-天文与天体物理
CiteScore
4.00
自引率
10.00%
发文量
109
审稿时长
13.6 weeks
期刊介绍: New Astronomy publishes articles in all fields of astronomy and astrophysics, with a particular focus on computational astronomy: mathematical and astronomy techniques and methodology, simulations, modelling and numerical results and computational techniques in instrumentation. New Astronomy includes full length research articles and review articles. The journal covers solar, stellar, galactic and extragalactic astronomy and astrophysics. It reports on original research in all wavelength bands, ranging from radio to gamma-ray.
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