Spatial Distribution of Gamma-Ray Burst Sources

Shirokov, S. I.; Raikov, A. A.; Baryshev, Yu. V.

doi:10.1007/s10511-017-9500-y

Cited by 8 publications

(9 citation statements)

References 19 publications

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“…The works by Nabokov and Baryshev [8], Lovyagin [23], Shirokov et al [30], Park et al [31] emphasize the importance of the analysis of the LSSU for the development of modern cosmology, which has become an increasingly important task in the 21st century. The spatial distribution of galaxies reflects both the initial conditions in the early Universe and the evolution of primordial density perturbations.…”

Section: Discussionmentioning

confidence: 99%

“…Super-large fractal-like structures with scales of more than 100 Mpc reveal themselves both in the spatial distribution of galaxies in the local Universe at redshifts of z 0.1 and in the quasars and gamma-ray bursts distributions at redshifts of z ∼ 2 [3,25,30,[32][33][34][35]. The analysis of fractal properties [3,32,36] can be used to describe the properties of the large-scale distribution of matter [25,30].…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, the metric bin size in logarithmic scale slightly depends on the redshift. Instead of analytical bias functions, numerical estimates of galaxy biases can be obtained from N-body simulations of the Universe (in a grid of model parameters) or by using the concept of model fractal catalogs, as in Shirokov et al [30].…”

Section: Discussionmentioning

confidence: 99%

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The Line-of-Sight Analysis of Spatial Distribution of Galaxies in the COSMOS2015 Catalogue

et al. 2020

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New observations of high-redshift objects are crucial for the improvement of the standard ΛCDM cosmological model and our understanding of the Universe. One of the main directions of modern observational cosmology is the analysis of the large-scale structure of Universe, in particular, in deep fields. We study the large-scale structure of the Universe along the line of sight using the latest version of the COSMOS2015 catalogue, which contains 518,404 high quality photometric redshifts of galaxies selected in the optical range of the COSMOS field (2×2 deg2), with depth up to the redshift z∼6. We analyze large-scale fluctuations in the number of galaxies along the line of sight and provide an estimate of the average linear sizes of the self-correlating fluctuations (structures) in independent redshift bins of Δz=0.1 along with the estimate of the standard deviation from homogeneity (the observed cosmic variance). We suggest a new method of the line-of-sight analysis based on previous works and formulate further prospects of method development. For the case of the theoretical form of approximation of homogeneity in the ΛCDM framework, the average standard deviation of detected structures from homogeneity is σmeanΛCDM=0.09±0.02, and the average characteristic size of structures is RmeanΛCDM=790±150 Mpc. For the case of the empirical approximation of homogeneity, the average standard deviation of detected structures from homogeneity is σmeanempiric=0.08±0.01, and the average characteristic size of structures is Rmeanempiric=640±140 Mpc.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The Line-of-Sight Analysis of Spatial Distribution of Galaxies in the COSMOS2015 Catalogue

et al. 2020

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“…Conditional density analysis of main galaxy samples was developed in [30], [15], [88]. Pairwise method was developed in [64,75].…”

Section: Testing Cosmological Principle By Grb Observationsmentioning

confidence: 99%

THESEUS$-$BTA cosmological tests using Multimessenger Gamma-Ray Bursts observations

Shirokov,

Sokolov,

Vlasyuk

et al. 2020

Preprint

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Modern Multimessenger Astronomy opens unique possibility for performing cosmological tests of the Standard Cosmological Model in the wide redshift interval up to z ∼ 10. This is principally important for recent discussion related to discrepancies between local and global measurements of cosmological parameters. We present a review of multimessenger Gamma-Ray Bursts observations currently performed and planed for THESEUS-BTA cooperative program. Such observations allow testing the fundamental basis of cosmological models: gravitation theory; cosmological principle of homogeneity and isotropy of the large scale matter distribution; and space expansion paradigm. Important role of different selection effects, which lead to systematic distortions of the true cosmological relations, is discussed.

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“…Balázs et al (2015Balázs et al ( , 2018 found an over-density of GRBs in the redshift range of 0.78 < z < 0.86 (comoving distance of 2 770 Mpc), which forms a ring-like shape displayed by 9 GRBs with a diameter of 1 720 Mpc. Other recent works which study the spatial distribution of GRBs with known redshift were done by Raikov et al (2010); Shirokov et al (2017).…”

Section: Introductionmentioning

confidence: 99%

Update on Testing the Isotropy of the Properties of Gamma-Ray Bursts

Řípa,

Shafieloo

2018

Preprint

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Previously we proposed a novel method to inspect the isotropy of the properties of gamma-ray bursts (GRBs) such as their duration, fluences and peak fluxes at various energy bands and different time scales, complementary to existing studies of spatial distribution of GRBs by other authors. The method was then applied on the Fermi GBM Burst Catalog containing 1591 GRBs and except one particular direction where we noticed some hints of violation from statistical isotropy, the rest of the data showed consistency with isotropy. In this work we apply our method with some minor modifications to the updated Fermi/GBM data sample containing 2266 GRBs, thus ∼ 40 % larger. We also test two other major GRB catalogs, the BATSE Current GRB Catalog of the CGRO satellite containing ∼ 2000 bursts and the Swift/BAT Gamma-Ray Burst Catalog containing ∼ 1200 bursts. The new results using the updated data are consistent with our previous findings and no statistically significant anisotropic feature in the observed properties of these samples of all GRBs is found.

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Spatial Distribution of Gamma-Ray Burst Sources

Cited by 8 publications

References 19 publications

The Line-of-Sight Analysis of Spatial Distribution of Galaxies in the COSMOS2015 Catalogue

The Line-of-Sight Analysis of Spatial Distribution of Galaxies in the COSMOS2015 Catalogue

THESEUS$-$BTA cosmological tests using Multimessenger Gamma-Ray Bursts observations

Update on Testing the Isotropy of the Properties of Gamma-Ray Bursts

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