Yet another test of Radial Acceleration Relation for galaxy clusters

Pradyumna, S.; Gupta, Sajal; Seeram, Sowmya; Desai, S.

doi:10.1016/j.dark.2020.100765

Cited by 33 publications

(41 citation statements)

References 71 publications

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“…We see a clear indication that the normalisation of the median RAR increases with increasing luminosity, which is sensible given the results of figure 6 and the fact that central luminosity correlates positively with halo mass in our mocks. Interestingly, recent results suggest that the RAR of observed galaxy clusters also has an elevated normalisation relative to that of galaxy samples (Tian et al 2020; see also Pradyumna et al 2021), in qualitative agreement with our results. We also find that the typical scatter of the RAR varies non-monotonically with luminosity, being σ log[a tot ] ∼ 0.067, 0.069, 0.077, 0.066 in successively brighter bins.…”

Section: Optical Selectionsupporting

confidence: 93%

The radial acceleration relation in a $Λ$CDM universe

Paranjape,

Sheth

2021

Preprint

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We study the radial acceleration relation (RAR) between the total (a tot ) and baryonic (a bary ) centripetal acceleration profiles of central galaxies in the cold dark matter (CDM) paradigm. We analytically show that the RAR is intimately connected with the physics of the quasi-adiabatic relaxation of dark matter in the presence of baryons in deep potential wells. This cleanly demonstrates how a near-universal mean RAR and its scatter emerges in the low-acceleration regime (10 −12 m s −2 a bary 10 −10 m s −2 ) from an interplay between baryonic feedback processes and the distribution of CDM in dark halos. Our framework allows us to go further and study both higher and lower accelerations in detail, using analytical approximations and a realistic mock catalog of ∼ 342, 000 low-redshift central galaxies with M r ≤ −19. We show that, while the RAR in the baryon-dominated, high-acceleration regime (a bary 10 −10 m s −2 ) is very sensitive to details of the relaxation physics, a simple 'baryonification' prescription matching the relaxation results of hydrodynamical CDM simulations is remarkably successful in reproducing the observed RAR without any tuning. And in the (currently unobserved) ultra-low-acceleration regime (a bary 10 −12 m s −2 ), the RAR is sensitive to the abundance of diffuse gas in the halo outskirts, with our default model predicting a distinctive break from a simple power-law-like relation for Hi-deficient, diffuse gas-rich centrals. Our mocks also show that the RAR provides more robust, testable predictions of the ΛCDM paradigm at galactic scales, with implications for alternative gravity theories, than the baryonic Tully-Fisher relation.

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Section: Optical Selectionsupporting

confidence: 93%

The radial acceleration relation in a $Λ$CDM universe

Paranjape,

Sheth

2021

Preprint

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“…Other works also demonstrate a similar acceleration scale in galaxy clusters (Pradyumna et al 2021).…”

Section: Introductionsupporting

confidence: 58%

Mass-Velocity Dispersion Relation in MaNGA Brightest Cluster Galaxies

Tian,

Cheng,

McGaugh

et al. 2021

Preprint

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We investigate a kinematic scaling relation between the baryonic mass and the flat velocity dispersion, i.e. mass-velocity dispersion relation (MVDR), from the brightest cluster galaxies (BCGs) to the galaxy clusters. In our studies, the baryonic mass of BCGs is mainly estimated by photometry. The velocity dispersion profiles are explored with the integrated field unit (IFU) by Mapping Nearby Galaxies at Apache Point Observatory (MaNGA). For the first time, we reveal two significant results with 54 MaNGA BCGs: (1) the flat velocity dispersion profiles; (2) a tight empirical relation on the BCG-cluster scale together with cluster samples, i.e., MVDR, log(M bar /M ) = 4.1 +0.1 −0.1 log(σ los /km s −1 ) + 1.6 +0.3 −0.3 , with a tiny lognormal intrinsic scatter of 10 +2 −1 %. This slope is identical to the acceleration relation in galaxy clusters, which is reminiscent of the spiral galaxies, albeit at a larger characteristic acceleration scale. The residuals of the MVDR represent a Gaussian distribution, displaying no correlations with four properties: baryonic mass, scale length, surface density, and redshift. Notably, the MVDR on the BCG-cluster scale provides a strict test, which disfavors the general prediction of the slope of three in the dark matter model.

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“…where x i is (1 + z) data for every GRB. Similar to our works on galaxy clusters [34][35][36] and also [37], we have added in quadrature, an unknown intrinsic scatter σ int as an additional free parameter while fitting for Eq. 1.…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

Search for Cosmological time dilation from Gamma-Ray Bursts -- A 2021 status update

Singh,

Desai

2021

Preprint

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We carry out a search for signatures of cosmological time dilation in the light curves of Gamma Ray Bursts (GRBs), detected by the Neil Gehrels Swift Observatory . For this purpose, we calculate two different durations (T50 and T90) for a sample of 247 GRBs in the fixed rest frame energy interval of 140-350 keV, similar to a previous work [1]. We then carry out a power law-based regression analysis between the durations and redshifts. This search is done using both the unbinned as well as the binned data, where both the weighted mean and the geometric mean was used. For each analysis, we also calculate the intrinsic scatter to determine the tightness of the relation. We find that weighted mean-based binned data for long GRBs and the geometric mean-based binned data is consistent with the cosmological time dilation signature, whereas the analyses using unbinned durations show a very large scatter. We also make our analysis codes and the procedure for obtaining the light curves and estimation of T50/T90 publicly available.

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Yet another test of Radial Acceleration Relation for galaxy clusters

Cited by 33 publications

References 71 publications

The radial acceleration relation in a $Λ$CDM universe

The radial acceleration relation in a $Λ$CDM universe

Mass-Velocity Dispersion Relation in MaNGA Brightest Cluster Galaxies

Search for Cosmological time dilation from Gamma-Ray Bursts -- A 2021 status update

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