The Bulk Flow Motion and the Hubble-Lemaître Law in the Local Universe with the ALFALFA Survey

Avila, F.; Oliveira, Jezebel; Dias, Mariana L. S.; Bernui, Armando

doi:10.1007/s13538-023-01259-z

Cited by 7 publications

(3 citation statements)

References 68 publications

(105 reference statements)

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“…For the survey configuration we adopt the same parameters used in ref. [1] to reproduce the ALFALFA catalogue footprint, that is, the HI line emission survey of extragalactic sources in the Local Universe [55][56][57][58][59][60][61][62][63]. The survey covers two discontinuous regions on the sky, both in the declination range of 0 • < DEC < 36 • , in the right ascension intervals of 21 h 30 m < RA < 3 h 15 m (South galactic hemisphere) and 7 h 20 m < RA < 16 h 40 m (North galactic hemisphere).…”

Section: Log-normal Simulated Cataloguesmentioning

confidence: 99%

Correcting the gravitational dipole direction for a partial sky survey

Avila,

Bernui,

de Carvalho

et al. 2023

J. Phys.: Conf. Ser.

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Abstract. The gravitational dipole approach is suitable for measuring β, the velocity parameter scale and, consequently, fσ 8, the product of the cosmic growth rate, f, and the matter density fluctuation on scales of 8 Mpc/h, σ 8. In cosmology, measurements of fσ 8 are important because they are a powerful tool for constraining alternative gravity models. However, in gravitational dipole analyses, if one uses a survey with incomplete sky coverage, this will certainly bias the measurement of the direction and magnitude of the dipole, which must be corrected accordingly. In this work we follow a new approach developed in ref. [1] to correct gravitational dipole measurements for partial sky data. Specifically, we study the gravitational dipole direction, important information to obtain an unbiased value of β. Our results show that, when comparing the velocity of the Local Group with the gravitational dipole, the correction procedure can actually recover the dipole direction with great precision, ensuring a robust result for β.

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Section: Log-normal Simulated Cataloguesmentioning

confidence: 99%

Correcting the gravitational dipole direction for a partial sky survey

Avila,

Bernui,

de Carvalho

et al. 2023

J. Phys.: Conf. Ser.

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“…Measurements resulting from some earlier studies already suggested a large bulk flow (Rubin et al 1976;Lynden-Bell et al 1988). More recently, reports in the literature (see, e.g., Mc Conville & Colgáin 2023;Hong et al 2014;Kalbouneh et al 2023;Perivolaropoulos 2023) have studied the magnitude and direction of this bulk flow velocity with diverse approaches and investigating various cosmic tracers, where these studies confirm the dipole nature of the bulk flow, but point out some differences in the velocity magnitude and/or direction (Turnbull et al 2012;Scrimgeour et al 2016;Qin et al 2018;Avila et al 2023;Watkins et al 2023;Whitford et al 2023).…”

Section: Introductionmentioning

confidence: 98%

Bulk Flow Motion Detection in the Local Universe with Pantheon+ Type Ia Supernovae

Lopes,

Bernui,

Franco

et al. 2024

ApJ

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The bulk flow in the Local Universe is a collective phenomenon due to the peculiar motions of matter structures, which, instead of moving in random directions, appears to follow an approximate dipole velocity flow. We apply a directional analysis to investigate, through the Hubble-Lemaître diagram, the angular dependence of the Hubble constant H 0 of a sample of Type Ia supernovae from the Pantheon+ catalog in the Local Universe (0.015 ≤ z ≤ 0.06). We perform a directional analysis that reveals a statistically significant dipole variation of H 0, at more than 99.9% confidence level, showing that matter structures follow a dipole bulk flow motion toward (l, b) = (326.°1 ± 11.°2, 27.°8 ± 11.°2), close to the Shapley supercluster (l Shapley, b Shapley) = (311.°5, 32.°3), with velocity 132.14 ± 109.3 km s−1 at the effective distance 102.83 ± 10.2 Mpc. Interestingly, the antipodal direction of this dipole points close to the Dipole Repeller structure. Our analyses confirm that the gravitational dipole system Shapley-Dipole Repeller explains well the observed bulk flow velocity field in the Local Universe. Furthermore, we performed robustness tests that support our results. Additionally, our approach provides a measurement of the Hubble constant H 0 = 70.39 ± 1.4 km s−1 Mpc−1, at the effective distance 102.8 Mpc, z ≃ 0.025.

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“…An improved cosmological model-independent method of determining the value of the Hubble constant was also recently proposed by [40]. The determination of H 0 by methods with minimal cosmological assumptions has been recently developed in the literature by several authors [41][42][43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

A Hubble constant estimate from galaxy cluster and type Ia SNe observations

Colaço,

Ferreira,

Holanda

et al. 2024

J. Cosmol. Astropart. Phys.

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In this work, we constrain the Hubble constant parameter, H 0, using a combination of the Pantheon sample and galaxy clusters (GC) measurements from minimal cosmological assumptions. Assuming the validity of the cosmic distance duality relation, an estimator is created for H 0 that only depends on simple geometrical distances, which is evaluated from Pantheon and a GC angular diameter distance sample afterward. The statistical and systematic errors in GC measurements are summed in quadrature in our analysis. We find H 0 = 67.22 ± 6.07 km s-1 Mpc-1 in 1σ confidence level (C.L.). This measurement presents an error of around 9%, showing that future and better GC measurements can shed light on the current Hubble tension.

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The Bulk Flow Motion and the Hubble-Lemaître Law in the Local Universe with the ALFALFA Survey

Abstract: The bulk flow motion and the Hubble-Lemaître law in the Local Universe flow on the structures of the Local Universe which manifests through a dipolar behavior of the Hubble constant in opposite hemispheres.

Cited by 7 publications

References 68 publications

Correcting the gravitational dipole direction for a partial sky survey

Correcting the gravitational dipole direction for a partial sky survey

Bulk Flow Motion Detection in the Local Universe with Pantheon+ Type Ia Supernovae

A Hubble constant estimate from galaxy cluster and type Ia SNe observations

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