Protruding bullet heads indicating dark matter pull

Keshet, Uri; Raveh, Itay; Naor, Yossi

doi:10.1093/mnras/stab2808

Cited by 6 publications

(2 citation statements)

References 78 publications

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“…The later cases show the offset between BEC dark matter and the cloud of baryons, so as the bullet shape of the gas that have been investigated at the Bullet-Cluster scale (see e.g. (Keshet et al 2021)).…”

Section: Head-on Collisionmentioning

confidence: 91%

Exploration of simple scenarios involving Fuzzy Dark Matter cores and gas at local scales

Alvarez-Ríos¹,

Guzmán²

2022

Preprint

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We introduce a tool that solves the Schrödinger-Euler-Poisson system of equations and allows the study of the interaction between ultralight bosonic dark matter, whose dynamics is described with the Schrödinger-Poisson system and luminous matter which, as a first approximation, is modeled with a single component compressible ideal fluid. The two matter fields are coupled through the Poisson equation, whose source is the addition of both, dark matter and gas densities. We describe the numerical methods used to solve the system of equations and present tests for each of the two components, that show the accuracy and convergence properties of the code. As simple possible applications we present some toy scenarios: i) the merger between a core of dark matter with a cloud of gas that could be the process of galaxy formation, ii) the merger of bosonic dark matter plus gas configurations emulating basic models of galaxy mergers, and iii) the post merger properties, including the dark-matter offset from gas and the correlation between oscillations of the bosonic core and those of the gas.

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Section: Head-on Collisionmentioning

confidence: 91%

Exploration of simple scenarios involving Fuzzy Dark Matter cores and gas at local scales

Alvarez-Ríos¹,

Guzmán²

2022

Preprint

View full text Add to dashboard Cite

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“…Therefore, they are an excellent laboratory to investigate properties of the key constituents of clusters, namely the intracluster medium gas (ICM; e.g. Keshet et al 2021), the galaxies (e.g enhancement/quenching of star formation; Kelkar et al 2020;Hernández-Lang et al 2021), and the dark matter (e.g. Fischer et al 2021), even if they are observed at late stages of a merger (e.g., Tam et al 2020).…”

Section: Introductionmentioning

confidence: 99%

A major galaxy cluster merger caught by eROSITA: weak lensing mass distribution and kinematic description

Monteiro-Oliveira

2022

Preprint

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We present the weak lensing mass distribution of a triple merging cluster candidate at 𝑧 photo ∼ 0.36 belonging to a supercluster recently discovered during the eROSITA Performance Verification phase. Our analysis solved a previous tension in the merger classification by confirming that the cluster pair eFEDS J093513.3+004746 and eFEDS J093510.7+004910 is undergoing a major merger with a mass ratio 1.7 +0.5 −0.7 . According to our two-body kinematic description, the encounter happened 0.58 +0.15 −0.20 Gyr ago, in a scenario that supports the observed radio relic position at the cluster outskirts. However, the same analysis showed that the companion cluster, eFEDS J093501.1+005418, is not gravitationally bound to the interacting system and therefore it is not part of the supercluster. We also checked the impact of adopting a scaling relation to determine the halo concentration 𝑐 200 . At the observed merger stage, where the clusters have travelled ∼55 per cent of the path to reach the apoapsis, the choice of the 𝑐 200 (whether from a scaling relation or a free parameter in the mass model) does not change significantly either the cluster masses or the kinematic description.

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Surface brightness discontinuities in radio halos

Botteon¹,

Markevitch²,

Weeren³

et al. 2023

A&A

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Context. Dynamical motions in the intra-cluster medium (ICM) can imprint distinctive features on X-ray images that map the thermal bremsstrahlung emission from galaxy clusters, such as sharp surface brightness discontinuities due to shocks and cold fronts. The gas dynamics during cluster mergers may also drive large-scale turbulence in the ICM, which in turn generates extended (megaparsec-scale) synchrontron sources known as radio halos. Aims. Surface brightness edges have been found numerous times in the thermal gas of clusters based on X-ray observations. In contrast, edges in radio halos have only been observed in a handful of cases. Our goal is to search for new radio surface brightness discontinuities in the ICM. Methods. We inspected the images of the Bullet Cluster and the other 25 radio halos reported in the MeerKAT Galaxy Cluster Legacy Survey. To aid the identification of surface brightness discontinuities, we applied a gradient-filtering edge-detection method to the radio images. Results. We find that the adopted filtering technique is helpful in identifying surface brightness edges in radio images, allowing us to identify at least one gradient in half of the radio halos studied. For the Bullet Cluster, we find excellent agreement between the locations of the four radio discontinuities detected and the X-ray edges. This similarity informs us that there is substantial interplay between thermal and nonthermal components in galaxy clusters. This interplay is likely due to the frozen-in ICM magnetic field, which mediates the advection of cosmic rays while being dragged by thermal gas flows. Conclusions. We conclude that radio halos are shaped by dynamical motions in the ICM and that they often display surface brightness discontinuities, which appear to be co-located with edges in the thermal gas emission. Our results demonstrate that new and future generations of radio telescopes will provide an approach to efficiently detecting shocks and cold fronts in the ICM that is complementary to X-rays.

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Protruding bullet heads indicating dark matter pull

Cited by 6 publications

References 78 publications

Exploration of simple scenarios involving Fuzzy Dark Matter cores and gas at local scales

Exploration of simple scenarios involving Fuzzy Dark Matter cores and gas at local scales

A major galaxy cluster merger caught by eROSITA: weak lensing mass distribution and kinematic description

Surface brightness discontinuities in radio halos

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