X-ray emission from clusters of galaxies

Sarazin, Craig L.

doi:10.1103/revmodphys.58.1

Cited by 1,120 publications

(1,284 citation statements)

References 694 publications

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“…The central density and temperature of the ICM determine the cooling time scale t cool in the cluster core (Sarazin 1986), i.e. the time for which the thermal energy of the gas would be radiated away at the current cooling rate t cool 2.9 × 10 10 yr · n 10 −3 cm −3…”

Section: Core Properties Of the Icmmentioning

confidence: 99%

A pan-chromatic view of the galaxy cluster XMMU J1230.3+1339 atz= 0.975

Fassbender

Böhringer

Santos

et al. 2011

A&A

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Context. Observations of the formation and evolution of massive galaxy clusters and their matter components provide crucial constraints on cosmic structure formation, the thermal history of the intracluster medium (ICM), galaxy evolution, transformation processes, and gravitational and hydrodynamic interaction physics of the subcomponents. Aims. We characterize the global multi-wavelength properties of the X-ray selected galaxy cluster XMMU J1230.3+1339 at z = 0.975, a new system discovered within the XMM-Newton Distant Cluster Project (XDCP). We measure and compare various widely used mass proxies and identify multiple cluster-associated components from the inner core region out to the large-scale structure environment.Methods. We present a comprehensive galaxy cluster study based on a joint analysis of X-ray data, optical imaging and spectroscopy observations, weak lensing results, and radio properties for achieving a detailed multi-component view on a system at z ∼ 1. Results. We find an optically very rich and massive system with M 200 (4.2 ± 0.8) × 10 14 M , T X,2500 5.3 +0.7 −0.6 keV, and L bol X,500 (6.5 ± 0.7) × 10 44 erg s −1 . We have identified a central fly-through group close to core passage and find marginally extended 1.4 GHz radio emission possibly associated with the turbulent wake region of the merging event. On the cluster outskirts we see evidence for an on-axis infalling group with a second brightest cluster galaxy (BCG) and indications for an additional off-axis group accretion event. We trace two galaxy filaments beyond the nominal cluster radius and provide a tentative reconstruction of the 3D-accretion geometry of the system. Conclusions. In terms of total mass, ICM structure, optical richness, and the presence of two dominant BCG-type galaxies, the newly confirmed cluster XMMU J1230.3+1339 is likely the progenitor of a system very similar to the local Coma cluster, differing by 7.6 Gyr of structure evolution. This new system is an ideally suited astrophysical model laboratory for in-depth follow-up studies on the aggregation of baryons in the cold and hot phases.

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Section: Core Properties Of the Icmmentioning

confidence: 99%

A pan-chromatic view of the galaxy cluster XMMU J1230.3+1339 atz= 0.975

Fassbender

Böhringer

Santos

et al. 2011

A&A

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“…The observed X-ray emission produced by clusters of galaxies such as Virgo results from the thermal bremsstrahlung that takes place in the hot diffuse intracluster gas (see [6] for a complete review). The temperature profile T (r) of the gas can be inferred from the spectrum of the X-ray radiation.…”

Section: The M87 and Dsph Systemsmentioning

confidence: 99%

Detection of neutralino annihilation photons from external galaxies

et al. 1999

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We consider neutralino annihilation in dense extragalactic systems known to be dominated by dark matter, in particular M87 and several local dwarf spheroidal galaxies. These annihilations can produce energetic gamma rays which may be visible to atmosphericČerenkov telescopes. We explore the supersymmetric parameter space, and compute the expected flux of gamma-rays coming from these objects. It is shown that some parts of the parameter space lead to a signal observable with the next generation ofČerenkov telescopes, provided the supersymmetric dark matter has a clumpy structure, as may be expected in a hierarchical scenario for structure formation. 95.35.+d, 14.80.Ly, 95.85.Pw, 98.70.Rz

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“…Hot gaseous halos suffuse nearly every galaxy cluster and many galaxy groups (Forman & Jones 1982, Sarazin 1986, Kravtsov & Borgani 2012, and they are also very common (possibly ubiquitous) around massive elliptical galaxies (Forman et al 1985, Fabbiano 1989, including field ellipticals (Anderson et al 2015). The hot halo is strongly affected by both feedback from the galaxy and by accretion from the intergalactic medium (e.g.…”

Section: Introductionmentioning

confidence: 99%

A deepXMM–Newtonstudy of the hot gaseous halo around NGC 1961

Anderson

Churazov

Bregman

2015

Mon. Not. R. Astron. Soc.

104

118

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We examine 11 XMM-Newton observations of the giant spiral galaxy NGC 1961, allowing us to study the hot gaseous halo of a spiral galaxy in unprecedented detail. We perform a spatial and a spectral analysis; with the former, the hot halo is detected to at least 80 kpc and with the latter its properties can be measured in detail up to 42 kpc. We find evidence for a negative gradient in the temperature profile as is common for elliptical galaxies. We measure a rough metallicity profile, which is consistent with being flat at Z ∼ 0.2Z . Converting to this metallicity, the deprojected density profile is consistent with previous parametric fits, with no evidence for a break within 42 kpc (∼0.1R vir ). Extrapolating to the virial radius, we infer a hot halo mass comparable to the stellar mass of the galaxy, and a baryon fraction from the stars and hot gas of around 30%. The cooling time of the hot gas is orders of magnitude longer than the dynamical time, making the hot halo stable against cooling instabilities, and we argue that an extended stream of neutral Hydrogen seen to the NW of this galaxy is instead likely due to accretion from the intergalactic medium. The low metallicity of the hot halo suggests it too was likely accreted. We compare the hot halo of NGC 1961 to hot halos around isolated elliptical galaxies, and show that the total mass determines the hot halo properties better than the stellar mass.

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X-ray emission from clusters of galaxies

Cited by 1,120 publications

References 694 publications

A pan-chromatic view of the galaxy cluster XMMU J1230.3+1339 atz= 0.975

A pan-chromatic view of the galaxy cluster XMMU J1230.3+1339 atz= 0.975

Detection of neutralino annihilation photons from external galaxies

A deepXMM–Newtonstudy of the hot gaseous halo around NGC 1961

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