Suzaku Observation of the Ophiuchus Galaxy Cluster: One of the Hottest Cool Core Clusters

Fujita, Yutaka; Hayashida, Kentaro; Nagai, Michiko; Inoue, Susumu; Matsumoto, Hironori; Okabe, Nobuhiko; Reiprich, T. H.; Sarazin, Craig L.; Takizawa, Motokazu

doi:10.1093/pasj/60.5.1133

Cited by 60 publications

(66 citation statements)

References 77 publications

(80 reference statements)

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“…Similar results were reported in the Suzaku analysis of Ophiuchus (Fujita et al 2008). We also found that the modelling of the soft X-ray sky background using ROSAT All Sky Survey data close to Ophiuchus yielded a higher value NH = 0.46 × 10 22 cm −2 (Sect.…”

Section: Nhsupporting

confidence: 90%

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XMM-Newton and INTEGRAL analysis of the Ophiuchus cluster of galaxies

Nevalainen¹,

Eckert

Kaastra

et al. 2009

A&A

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Aims. We investigated the non-thermal hard X-ray emission in the Ophiuchus cluster of galaxies. Our aim is to characterise the physical properties of the non-thermal component and its interaction with the cosmic microwave background. Methods. We performed spatially resolved spectroscopy and imaging using XMM-Newton data to model the thermal emission. Combining this with INTEGRAL ISGRI data, we modelled the 0.6−140 keV band total emission in the central 7 arcmin region.Results. The models that best describe both PN and ISGRI data contain a power-law component with a photon index in a range 2.2−2.5. This component produces ∼10% of the total flux in the 1−10 keV band. The pressure of the non-thermal electrons is ∼1% of that of the thermal electrons. Our results support the scenario whereby a relativistic electron population, which produces the recently detected radio mini-halo in Ophiuchus, also produces the hard X-rays via inverse compton scattering of the CMB photons. The best-fit models imply a differential momentum spectrum of the relativistic electrons with a slope of 3.4−4.0 and a magnetic field strength B = 0.05−0.15 μG. The lack of evidence for a recent major merger in the Ophiuchus centre allows the possibility that the relativistic electrons are produced by turbulence or hadronic collisions.

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Section: Nhsupporting

confidence: 90%

“…Suzaku analysis of Ophiuchus suggested that Ophiuchus has a cool core (Fujita et al 2008). The typical cooling radius of 70 kpc (=2 arcmin) found in a cluster sample by the Chandra satellite (Vikhlinin et al 2006) is also consistent with the extent of the central excess.…”

Section: Cool Corementioning

confidence: 59%

XMM-Newton and INTEGRAL analysis of the Ophiuchus cluster of galaxies

Nevalainen¹,

Eckert

Kaastra

et al. 2009

A&A

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“…Suzaku data (Fujita et al 2008b) indicate that this cluster has a cool, dense core. We recently found at the cluster center a low surface brightness diffuse emission that it is classified has a mini-halo Murgia et al 2009Murgia et al , 2010b.…”

Section: Ophiuchusmentioning

confidence: 91%

Rotation measures of radio sources in hot galaxy clusters

Govoni

Dolag

Murgia

et al. 2010

A&A

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Aims. The goal of this work is to investigate the Faraday rotation measure (RM) of radio galaxies in hot galaxy clusters in order to establish a possible connection between the magnetic field strength and the gas temperature of the intracluster medium. Methods. We performed Very Large Array observations at 3.6 cm and 6 cm of two radio galaxies located in A401 and Ophiuchus, a radio galaxy in A2142, and a radio galaxy located in the background of A2065. All these galaxy clusters are characterized by high temperatures. Results. We obtained detailed RM images at an angular resolution of 3 for most of the observed radio galaxies. The RM images are patchy and reveal fine substructures of a few kpc in size. Under the assumption that the radio galaxies themselves have no effect on the measured RMs, these structures indicate that the intracluster magnetic fields fluctuate down to such small scales. These new data are compared with RM information present in the literature for cooler galaxy clusters. For a fixed projected distance from the cluster center, clusters with higher temperature show a higher dispersion of the RM distributions (σ RM ), mostly because of the higher gas density in these clusters. Although the previously known relation between the clusters X-ray surface brightness (S X ) at the radio galaxy location and σ RM is confirmed, a possible connection between the σ RM − S X relation and the cluster temperature, if present, is very weak. Therefore, in view of the current data, it is impossible to establish a strict link between the magnetic field strength and the gas temperature of the intracluster medium.

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“…Suzaku data (Fujita et al 2008) and the archival Chandra data indicate that this hot cluster has a cool, dense core. The archival wide-field ROSAT PSPC image suggests an ongoing unequal-mass merger, but the Chandra image indicates that the core is still largely undisturbed, although it exhibits the prototypical cold fronts caused by gas sloshing (Ascasibar & Markevitch 2006).…”

Section: Ophiuchusmentioning

confidence: 93%

A search for diffuse radio emission in the relaxed, cool-core galaxy clusters A1068, A1413, A1650, A1835, A2029, and Ophiuchus

Govoni¹,

Murgia

Markevitch

et al. 2009

A&A

106

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Aims. We analyze sensitive, high-dynamic-range, observations to search for extended, diffuse, radio emission in relaxed and coolcore galaxy clusters. Methods. We performed deep 1.4 GHz Very Large Array observations, of A1068, A1413, A1650, A1835, A2029, and complemented our dataset with archival observations of Ophiuchus. Results. We find that, in the central regions of A1835, A2029, and Ophiuchus, the dominant radio galaxy is surrounded by diffuse low-brightness radio emission that takes the form of a mini-halo. We detect no diffuse emission in A1650, at a surface brightness level of the other mini-halos. We find low significance indications of diffuse emission in A1068 and A1413, although to be classified as mini-halos they would require further investigation, possibly with data of higher signal-to-noise ratio. In the Appendix, we report on the serendipitous detection of a giant radio galaxy with a total spatial extension of ∼1.6 Mpc.

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Suzaku Observation of the Ophiuchus Galaxy Cluster: One of the Hottest Cool Core Clusters

Cited by 60 publications

References 77 publications

XMM-Newton and INTEGRAL analysis of the Ophiuchus cluster of galaxies

XMM-Newton and INTEGRAL analysis of the Ophiuchus cluster of galaxies

Rotation measures of radio sources in hot galaxy clusters

A search for diffuse radio emission in the relaxed, cool-core galaxy clusters A1068, A1413, A1650, A1835, A2029, and Ophiuchus

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