nIFTY galaxy cluster simulations – III. The similarity and diversity of galaxies and subhaloes

Elahi, Pascal J.; Knebe, Alexander; Pearce, Frazer R.; Power, Chris; Yepes, Gustavo; Cui, Weiguang; Cunnama, Daniel; Kay, Scott T.; Sembolini, Federico; Beck, Alexander M.; Davé, Romeel; February, Sean; Huang, Shuiyao; Katz, Neal; McCarthy, Ian G.; Murante, Giuseppe; Perret, V.; Puchwein, Ewald; Saro, A.; Teyssier, Romain

doi:10.1093/mnras/stw338

Cited by 38 publications

(40 citation statements)

References 122 publications

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“…The galaxies also differ due to the varying treatment of baryonic processes, as seen in e.g. Sembolini et al (2016a,b); Elahi et al (2016); Cui et al (2016b); Arthur et al (2017). Note that the galaxy positions are identical for the two SAMs as they reflect the positions of the dark matter haloes in the underlying dark-matter-only simulation which are the same.…”

Section: Cluster Bulk Propertiesmentioning

confidence: 92%

The Three Hundred project: a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications

Cui

Knebe

Yepes

et al. 2018

Monthly Notices of the Royal Astronomical Society

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210

217

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We introduce the The Three Hundred project, an endeavour to model 324 large galaxy clusters with full-physics hydrodynamical re-simulations. Here we present the dataset and study the differences to observations for fundamental galaxy cluster properties and scaling relations. We find that the modelled galaxy clusters are generally in reasonable agreement with observations with respect to baryonic fractions and gas scaling relations at redshift z = 0. However, there are still some (model-dependent) differences, such as central galaxies being too massive, and galaxy colours (g −r) being bluer (about 0.2 dex lower at the peak position) than in observations. The agreement in gas scaling relations down to 10 13 h −1 M between the simulations indicates that particulars of the sub-grid modelling of the baryonic physics only has a weak influence on these relations. We also include -where appropriate -a comparison to three semianalytical galaxy formation models as applied to the same underlying dark matter only simulation. All simulations and derived data products are publicly available.observed properties of the Intra-Cluster Medium (ICM), the size of the central brightest cluster galaxy and the number and properties of the satellite galaxies orbiting within a common dark matter envelope. Clusters of galaxies can therefore be considered to be large cosmological laboratories that are useful for pinning down both cosmological parameters and empirical models of astrophysical processes acting across a range of coupled scales.Concerted effort, from both observational and theoretical perspectives, has been devoted to improve our understanding of the formation and evolution of galaxy clusters. On the observational side, multi-wavelength telescopes are

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Section: Cluster Bulk Propertiesmentioning

confidence: 92%

The Three Hundred project: a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications

Cui

Knebe

Yepes

et al. 2018

Monthly Notices of the Royal Astronomical Society

Self Cite

210

217

View full text Add to dashboard Cite

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“…Simulations are run from redshift 120 to redshift zero. Note that the N-body code used in this paper is different from that used in our previous papers (e.g Sorce et al 2016b) for two reasons: 1) results obtained with two different N-body code are supposed to be similar in the dark matter only case (Elahi et al 2016). We check that this is indeed the case for our constrained simulations ; 2) in a perspective of hydrodynamical simulations of the Virgo cluster, the adaptive mesh refinement grid code will be used.…”

Section: Simulationsmentioning

confidence: 96%

Virgo: an unlikely cluster of galaxies because of its environment

Sorce

Blaizot

Dubois

2019

Monthly Notices of the Royal Astronomical Society

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Galaxy clusters constitute powerful cosmological probes thanks to comparisons between observed and simulated clusters. As such Virgo constitutes a formidable source for detailed observations facilitated by its proximity. However, the diversity of clusters complicates the comparisons on a one-to-one basis. Simulated clusters must be carefully selected, a daunting task since most properties are unknown. Alternatively, lookalikes produced in the proper large scale environment can be used. Additionally, their statistical study give access to the mean properties of the observed cluster including its most probable history as well as its deviation from an average cluster. This paper presents such a statistical study with 200 Virgo-like and 400+ cluster-size random dark matter halos. Only 18%(0.5%) of these random halos comply within 3(2)σ with the mean values (radius, velocity dispersion, number of substructures, spin, velocity, concentration, center of mass offset with respect to the spherical center) of Virgo halos at z=0 and abide by a similar merging history up to redshift 4. None are within 1σ because of environmentally induced properties (number of substructures and velocity). For further comparisons, random halos are selected to reproduce the mass distribution of the lookalikes to cancel mass bias effects. Redshift 1 appears then as a turning point: random to Virgo-like property ratios are alternatively smaller/larger than 1. This highlights the importance of studying clusters within their proper large scale environment: simulated galaxy population, grandly affected by the cluster history, can then be compared with the observed one in details. Direct lookalikes simplify grandly the challenge.

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“…GadgetX, equipped with these subgrid schemes, has been extensively tested by the Trieste numerical group (Rasia et al 2015;Planelles et al 2017;Biffi et al 2017) and in the nIFTy cluster comparison project (Sembolini et al 2016b;Elahi et al 2016;Cui et al 2016;Arthur et al 2017). These latter studies have shown that GadgetX was able to produce a realistic and stable M200 = 1.1 x 10 15 h −1 M cluster at z = 0, using a similar particle mass resolution as used in TheThreeHundred project.…”

Section: Hydrodynamical Codementioning

confidence: 99%

TheThreeHundred Project: ram pressure and gas content of haloes and subhaloes in the phase-space plane

Arthur

Pearce

Gray

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We use TheThreeHundred project, a suite of 324 resimulated massive galaxy clusters embedded in a broad range of environments, to investigate (i) how the gas content of surrounding haloes correlates with phase-space position at z = 0, and (ii) to investigate the role that ram pressure plays in this correlation. By stacking all 324 normalised phase-space planes containing 169287 haloes and subhaloes, we show that the halo gas content is tightly correlated with phase-space position. At ∼ 1.5−2 R 200 of the cluster dark matter halo, we find an extremely steep decline in the halo gas content of infalling haloes and subhaloes irrespective of cluster mass, possibly indicating the presence of an accretion shock. We also find that subhaloes are particularly gas-poor, even in the cluster outskirts, which could indicate active regions of ongoing pre-processing. By modelling the instantaneous ram pressure experienced by each halo and subhalo at z = 0, we show that the ram pressure intensity is also well correlated with phase-space position, which is again irrespective of cluster mass. In fact, we show that regions in the phase-space plane with high differential velocity between a halo or subhalo and its local gas environment, are almost mutually exclusive with high halo gas content regions. This suggests a causal link between the gas content of objects and the instantaneous ram pressure they experience, where the dominant factor is the differential velocity.

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nIFTY galaxy cluster simulations – III. The similarity and diversity of galaxies and subhaloes

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Cited by 38 publications

References 122 publications

The Three Hundred project: a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications

The Three Hundred project: a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications

Virgo: an unlikely cluster of galaxies because of its environment

TheThreeHundred Project: ram pressure and gas content of haloes and subhaloes in the phase-space plane

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