Biases in velocity reconstruction: investigating the effects on growth rate and expansion measurements in the local universe

التفاصيل البيبلوغرافية
العنوان: Biases in velocity reconstruction: investigating the effects on growth rate and expansion measurements in the local universe
المؤلفون: Turner, Ryan J., Blake, Chris
المصدر: Mon.Not.Roy.Astron.Soc. 526 (2023) 337-346
سنة النشر: 2023
المجموعة: Astrophysics
مصطلحات موضوعية: Astrophysics - Cosmology and Nongalactic Astrophysics
الوصف: The local galaxy peculiar velocity field can be reconstructed from the surrounding distribution of large-scale structure and plays an important role in calibrating cosmic growth and expansion measurements. In this paper, we investigate the effect of the stochasticity of these velocity reconstructions on the statistical and systematic errors in cosmological inferences. By introducing a simple statistical model between the measured and theoretical velocities, whose terms we calibrate from linear theory, we derive the bias in the model velocity. We then use lognormal realisations to explore the potential impact of this bias when using a cosmic flow model to measure the growth rate of structure, and to sharpen expansion rate measurements from host galaxies for gravitational wave standard sirens with electromagnetic counterparts. Although our illustrative study does not contain fully realistic observational effects, we demonstrate that in some scenarios these corrections are significant and result in a measurable improvement in determinations of the Hubble constant compared to standard forecasts.
Comment: 10 pages, 10 figures, 1 table, 1 appendix. Resolved an issue where some references were not displayed correctly
نوع الوثيقة: Working Paper
DOI: 10.1093/mnras/stad2713
URL الوصول: http://arxiv.org/abs/2306.16664
رقم الأكسشن: edsarx.2306.16664
قاعدة البيانات: arXiv