Mass, velocity anisotropy, and pseudo phase-space density profiles of Abell 2142

Munari, E.; Biviano, A.; Mamon, G. A.

doi:10.1051/0004-6361/201322450

Cited by 59 publications

(90 citation statements)

References 70 publications

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“…Munari et al (2014) compared several mass estimation methods and concluded that the mass of the cluster is M 200 = 0.875 × 10 15 h −1 M (if recalculated to the Hubble parameter H 0 = 100 h km s −1 Mpc −1 , as used in our paper); this value is 0.965 times lower than the dynamical mass of A2142 as calculated in Tempel et al (2014b). This shows that the masses in Tempel et al (2014b) are quite precise.…”

Section: Abell Cluster A2142mentioning

confidence: 52%

Unusual A2142 supercluster with a collapsing core: distribution of light and mass

Einasto

Gramann

Saar

et al. 2015

A&A

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Context. Superclusters of galaxies can be used to test cosmological models of the formation and evolution of the largest structures in the cosmic web, and of galaxy and cluster evolution in superclusters. Aims. We study the distribution, masses, and dynamical properties of galaxy groups in the A2142 supercluster. Methods. We analyse the global luminosity density distribution in the supercluster and divide the supercluster into the high-density core and the low-density outskirts regions. We find galaxy groups and filaments in these regions, calculate their masses and mass-tolight ratios and analyse their dynamical state with 1D and 3D statistics. We use the spherical collapse model to study the dynamical state of the supercluster. Results. In the A2142 supercluster rich groups and clusters lie along an almost straight line forming the 50 h −1 Mpc long main body of the supercluster. The A2142 supercluster has a very high density core surrounded by lower-density outskirts. The total estimated mass of the supercluster is M est = 6.2 × 10 15 M . More than a half of groups with at least ten member galaxies in the supercluster lie in the high-density core of the supercluster, centred at the X-ray cluster A2142. Most of the groups in the core region are multimodal. In the outskirts of the supercluster, the number of groups is larger than in the core, and groups are poorer. The orientation of the axis of the cluster A2142 follows the orientations of its X-ray substructures and radio halo, and is aligned along the supercluster axis. The high-density core of the supercluster with the global density D8 ≥ 17 and perhaps with D8 ≥ 13 may have started to collapse. Conclusions. A2142 supercluster with collapsing core and straight body, is an unusual object among superclusters. In the course of the future evolution, the supercluster may split into several systems.

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Section: Abell Cluster A2142mentioning

confidence: 52%

Unusual A2142 supercluster with a collapsing core: distribution of light and mass

Einasto

Gramann

Saar

et al. 2015

A&A

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“…The red curve indicates the mass profile inferred from spectroscopic X-ray measurements (Ettori et al 2010). The symbols indicate the values of M 200 calculated from weak gravitational lensing (pink triangle, Umetsu et al 2009), galaxy kinematics (black triangle, Munari et al 2014) and Suzaku X-ray (green square, Akamatsu et al 2011) non-thermal energy budget in galaxy clusters; iii) detect infalling gas clumps to study the virialization of infalling halos within the potential well of the main structure.…”

Section: Discussionmentioning

confidence: 99%

The XMM cluster outskirts project (X‐COP)

et al. 2017

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Galaxy clusters are thought to grow hierarchically through the continuous merging and accretion of smaller structures across cosmic time. In the Local Universe, these phenomena are still active in the outer regions of massive clusters (R > R500), where the matter distribution is expected to become clumpy and asymmetric because of the presence of accreting structures. We present the XMM-Newton Cluster Outskirts Project (X-COP), which targets the outer regions of a sample of 13 massive clusters (M500 > 3 × 10 14 M ) in the redshift range 0.04-0.1 at uniform depth. The sample was selected based on the signal-to-noise ratio in the Planck Sunyaev-Zeldovich (SZ) survey with the aim of combining high-quality X-ray and SZ constraints throughout the entire cluster volume. Our observing strategy allows us to reach a sensitivity of 3 × 10 −16 ergs cm −2 s −1 arcmin −2 in the [0.5-2.0] keV range thanks to a good control of systematic uncertainties. The combination of depth and field of view achieved in X-COP will allow us to pursue the following main goals: i) measure the distribution of entropy and thermal energy to an unprecedented level of precision; ii) assess the presence of non-thermal pressure support in cluster outskirts; iii) study the occurrence and mass distribution of infalling gas clumps. We illustrate the capabilities of the program with a pilot study on the cluster Abell 2142.

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“…where M 500 =8.66·10 14 M is the cluster mass at R 500 = 1408 kpc (values derived from Munari et al 2014), f b = Ω b /Ω m = 0.15 is the cosmic baryon fraction, with Ω b the baryon density, Ω m the matter density, and h(z) = Ω m (1 + z) 3 + Ω Λ the ratio of the Hubble constant at redshift z to its present value.…”

Section: Entropy Profilementioning

confidence: 99%

“…This cluster belongs to the sample selected in the framework of the XMM Cluster Outskirts Project (X-COP), a Very Large Program on XMM-Newton which aims at studying the outskirts of an SZ-selected sample of 13 massive, nearby clusters. Abell 2142 is a massive cluster (M 200 ∼ 1.3 × 10 15 M , Munari et al 2014) at a redshift of 0.09 (Owers et al 2011). The cluster hosts a moderate cool core (K 0 = 68 keV cm 2 , Cavagnolo et al 2009) and exhibits multiple concentric cold fronts in its central regions (Markevitch et al 2000;Rossetti et al 2013), which are indicative of ongoing sloshing activity extending out to 1 Mpc from the cluster center (Rossetti et al 2013).…”

Section: Introductionmentioning

confidence: 99%

The XMM Cluster Outskirts Project (X-COP): Physical conditions of Abell 2142 up to the virial radius

Tchernin

Eckert

Ettori

et al. 2016

A&A

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Context. Galaxy clusters are continuously growing through the accretion of matter in their outskirts. This process induces inhomogeneities in the gas density distribution (clumping) which need to be taken into account to recover the physical properties of the intracluster medium (ICM) at large radii. Aims. We studied the thermodynamic properties in the outskirts (R > R 500 ) of the massive galaxy cluster Abell 2142 by combining the Sunyaev Zel'dovich (SZ) effect with the X-ray signal. Methods. We combined the SZ pressure profile measured by Planck with the XMM-Newton gas density profile to recover radial profiles of temperature, entropy and hydrostatic mass out to 2R 500 . We used a method that is insensitive to clumping to recover the gas density, and we compared the results with traditional X-ray measurement techniques. Results. When taking clumping into account, our joint SZ/X-ray entropy profile is consistent with the predictions from pure gravitational collapse, whereas a significant entropy flattening is found when the effect of clumping is neglected. The hydrostatic mass profile recovered using joint X-ray/SZ data agrees with that obtained from spectroscopic X-ray measurements and with mass reconstructions obtained through weak lensing and galaxy kinematics. Conclusions. We found that clumping can explain the entropy flattening observed by Suzaku in the outskirts of several clusters. When using a method insensitive to clumping for the reconstruction of the gas density, the thermodynamic properties of Abell 2142 are compatible with the assumption that the thermal gas pressure sustains gravity and that the entropy is injected at accretion shocks, with no need to evoke more exotic physics. Our results highlight the need for X-ray observations with sufficient spatial resolution, and large collecting area, to understand the processes at work in cluster outer regions.

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Mass, velocity anisotropy, and pseudo phase-space density profiles of Abell 2142

Cited by 59 publications

References 70 publications

Unusual A2142 supercluster with a collapsing core: distribution of light and mass

Unusual A2142 supercluster with a collapsing core: distribution of light and mass

The XMM cluster outskirts project (X‐COP)

The XMM Cluster Outskirts Project (X-COP): Physical conditions of Abell 2142 up to the virial radius

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