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The Pantheon+ Analysis: Evaluating Peculiar Velocity Corrections in Cosmological Analyses with Nearby Type Ia Supernovae
Erik R. Peterson,W. D'Arcy Kenworthy,Daniel Scolnic,Adam G. Riess,Dillon Brout,Anthony Carr,Hélène M. Courtois,Tamara M. Davis,Arianna Dwomoh,David O. Jones +9 more
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In this paper, the authors study the two dominant'motions' contributing to nearby peculiar redshifts: large-scale, coherent-flow (CF) motions and small-scale motions due to gravitationally-associated galaxies deemed to be in a galaxy group.Abstract:
Separating the components of redshift due to expansion and motion in the nearby universe ($z<0.1$) is critical for using Type Ia Supernovae (SNe Ia) to measure the Hubble constant ($H_0$) and the equation-of-state parameter of dark energy ($w$). Here, we study the two dominant 'motions' contributing to nearby peculiar redshifts: large-scale, coherent-flow (CF) motions and small-scale motions due to gravitationally-associated galaxies deemed to be in a galaxy group. We use a set of 585 low-$z$ SNe from the Pantheon+ sample, and evaluate the efficacy of corrections to these motions by measuring the improvement of SN distance residuals. We study multiple methods for modeling the large and small-scale motions and show that while group assignments and CF corrections individually contribute to small improvements in Hubble residual scatter, the greatest improvement comes from the combination of the two (relative standard deviation of the Hubble residuals RSD improves from 0.167 mag to 0.157 mag). We find the optimal flow corrections derived from various local density maps significantly reduce Hubble residuals while raising $H_0$ by $\sim0.4$ km s$^{-1}$ Mpc$^{-1}$ as compared to using CMB redshifts, disfavoring the hypothesis that unrecognized local structure could resolve the Hubble tension. We estimate that the systematic uncertainties in cosmological parameters after optimally correcting redshifts are 0.08-0.17 km s$^{-1}$ Mpc$^{-1}$ in $H_0$ and 0.02-0.03 in $w$ which are smaller than the statistical uncertainties for these measurements: 1.5 km s$^{-1}$ Mpc$^{-1}$ for $H_0$ and 0.04 for $w$.read more
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The Pantheon+ Analysis: Cosmological Constraints
D. Brout,Daniel Scolnic,Brodie Popovic,Adam G. Riess,Anthony Carr,Joe Zuntz,Richard Kessler,Tamara M. Davis,Samuel Hinton,David Jones,William Kenworthy,E. Peterson,Khaled Said,George Benedict Taylor,Noor Ali,P. Armstrong,Pranav Charvu,Arianna Dwomoh,C. Meldorf,Antonella Palmese,Helen Qu,Benjamin Rose,B. Sanchez,Christopher W. Stubbs,Marian Vincenzi,Charlotte M. Wood,Rena Chen,K. C. Chambers,David A. Coulter,M. Dai,Georgios Dimitriadis,Alexei V. Filippenko,Ryan J. Foley,Saurabh Jha,L. Kelsey,Robert P. Kirshner,Anais Möller,J. Muir,Seshadri Nadathur,Yen-Chen Pan,Armin Rest,César Rojas-Bravo,Masao Sako,Matthew R. Siebert,Matthew Smith,Benjamin E. Stahl,P. Wiseman +46 more
TL;DR: In this article , the authors present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift from z = 0.001 to 2.26.
Journal ArticleDOI
The Pantheon+ Analysis: The Full Data Set and Light-curve Release
Waheed Rehman,Burkhard Simma +1 more
TL;DR: In this paper , the authors present 1701 light curves of 1550 unique, spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part of the Pantheon+ SN analysis and the Supernovae and H 0 for the Equation of State of dark energy distanceladder analysis.
Journal ArticleDOI
Is the observable Universe consistent with the cosmological principle?
Pavan K. Aluri,Paolo Cea,Pravabati Chingangbam,Ming Chung Chu,Roger G. Clowes,D. Hutsem'ekers,Joby P. Kochappan,Andrzej Krasi'nski,Alexia M. Lopez,Bangtian Liu,Niels C.M. Martens,Carlos Martins,K. Migkas,Eoin 'O Colg'ain,Pratyush Pranav,Lior Shamir,Ashok K. Singal,Mohammmad Mahdi Sheikh-Jabbari,Jenny Wagner,Shao-Jiang Wang,David L. Wiltshire,Shek Yeung,Li Yin,Wen-Chang Zhao +23 more
TL;DR: The cosmological principle (CP), the notion that the universe is spatially isotropic and homogeneous on large scales, has been used for a century of progress in cosmology as mentioned in this paper .
Journal ArticleDOI
The Pantheon+ Analysis: SuperCal-fragilistic Cross Calibration, Retrained SALT2 Light-curve Model, and Calibration Systematic Uncertainty
TL;DR: In this paper , a recalibration of the photometric systems in the Pantheon+ sample of Type Ia supernovae (SNe Ia) including those in the SH0ES distance-ladder measurement of H 0 .
Journal ArticleDOI
Cosmological distances with general-relativistic ray tracing: framework and comparison to cosmographic predictions
TL;DR: In this article , the authors used a ray-tracing tool to calculate cosmological distances in the context of fully nonlinear general relativity, and found the general, third-order cosmography is accurate to within 1% for redshifts to z ≈ 0.034 when sampling scales strictly above 100 h -1 Mpc.
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