Weak Gravitational Lensing by a Sample of X‐Ray Luminous Clusters of Galaxies. I. The Data Set

Dahle, H.; Kaiser, Nick; Irgens, R. J.; Lilje, P. B.; Maddox, S.

doi:10.1086/338678

Cited by 141 publications

(264 citation statements)

References 64 publications

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“…It shows also an unusually high velocity dispersion, and the presence of a bright red gravitational arc offset from the cluster light center (Dahle et al 2002). Owen et al (1999) reported the existence of a halo source in this cluster.…”

Section: New Radio Halos At 14 Ghzmentioning

confidence: 86%

“…It is dominated by a central cD galaxy, and the peak of the cluster mass distribution is close to this galaxy. A candidate gravitational arc is visible inside the cD halo (Dahle et al 2002). ROSAT HRI data for this cluster indicate an irregular X-ray morphology with significant substructure (Rizza et al 1998).…”

Section: New Radio Halos At 14 Ghzmentioning

confidence: 88%

“…The light distribution in this cluster is quite strongly elongated in the northeast-southwest direction, but the mass distribution is more circularly symmetric and concentrated. Moreover, Dahle et al (2002) discussed the presence of several blue arcs. The X-ray morphology analyzed by Patel et al (2000) appears very similar to the mass distribution.…”

Section: New Radio Halos At 14 Ghzmentioning

confidence: 99%

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Radio halos in nearby (z < 0.4) clusters of galaxies

Giovannini

Bonafede

Feretti

et al. 2009

A&A

170

263

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Context. The intra-cluster medium is characterized by thermal emission, and by the presence of large scale magnetic fields. In some clusters of galaxies, a diffuse non-thermal emission is also present, located at the cluster center and called radio halo. These sources indicate the existence of relativistic particles and magnetic fields in the cluster volume. Aims. In this paper we collect data on all known nearby cluster radio halos (z < 0.4), to discuss their statistical properties and to investigate their origin. Methods. We searched for published data on radio halos and reduced new and archive VLA data to increase the number of known radio halos.Results. We present data on 31 radio halos, 1 new relic source, and 1 giant filament. We note the discovery of a small size diffuse radio emission in a cluster (A1213) with very low X-ray luminosity. Among the statistical results, we confirm the correlation between the average halo radio spectral index and the cluster temperature. We also discuss the high percentage of clusters where both a relic and a radio halo is present. Conclusions. The sample of radio halos discussed here represents the population of radio halos observable with current radio telescopes. A new telescope generation is necessary for a more detailed multifrequency study, and to investigate the possible existence of a population of radio halos with different properties.

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Section: New Radio Halos At 14 Ghzmentioning

confidence: 86%

Section: New Radio Halos At 14 Ghzmentioning

confidence: 88%

Section: New Radio Halos At 14 Ghzmentioning

confidence: 99%

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Radio halos in nearby (z < 0.4) clusters of galaxies

Giovannini

Bonafede

Feretti

et al. 2009

A&A

170

263

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“…X-ray and optical observations suggest that the cluster has experienced a recent merger (e.g. Dahle et al 2002;Morrison et al 2003).…”

Section: A 1682: a Very Complex Clustermentioning

confidence: 99%

153 MHz GMRT follow-up of steep-spectrum diffuse emission in galaxy clusters

Macario

Venturi

Intema

et al. 2013

A&A

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Aims. We present new high-sensitivity 153 MHz Giant Meterwave Radio Telescope follow-up observations of the diffuse steepspectrum cluster radio sources in the galaxy clusters Abell 521, Abell 697, and Abell 1682. Abell 521 hosts a relic, and together with Abell 697 it also hosts a giant very steep-spectrum radio halo. Abell 1682 is a more complex system with candidate steep spectrum diffuse emission. Methods. We imaged the diffuse radio emission in these clusters at 153 MHz, and provided flux density measurements of all sources at this frequency. Our new flux density measurements, coupled with the existing data at higher frequencies, allowed us to study the total spectrum of the halos and relic over at least one order of magnitude in frequency. Results. Our images confirm the very steep "diffuse component" in Abell 1682. We found that the spectrum of the relic in Abell 521 can be fitted by a single power-law with α = 1.45 ± 0.02 from 153 MHz to 5 GHz. Moreover, we confirm that the halos in Abell 521 and Abell 697 have a very steep spectrum , with α = 1.8−1.9 and α = 1.52 ± 0.05, respectively. Even including of the 153 MHz flux density information, it is impossible to distinguish between power-law and curved spectra, as derived from homogeneous turbulent re-acceleration. The latter are favoured on the basis of simple energetic arguments, and we expect that LOFAR will finally unveil the spectral shape of radio halos below 100 MHz, thus providing clues on their origin.

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“…A mass map generated using the method of [28] shows a 4 detection of mass in this region, compared to ''noise'' maps based on randomized shear values. A detailed description of the data and methodology of the weak lensing analysis is given elsewhere [29]. An independent weak lensing analysis of Abell 520 [30] confirms the existence of the blob, centered at a slightly different position.…”

Section: The Dark Matter Blob In the Galaxy Cluster Abell 520mentioning

confidence: 99%

Probing the nature of dark matter with cosmic x rays: Constraints from “dark blobs” and grating spectra of galaxy clusters

et al. 2007

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Gravitational lensing observations of galaxy clusters have identified dark matter blobs with remarkably low baryonic content. We use such a blob to probe the particle nature of dark matter with x-ray observations. From these observations we improve the most conservative constraints from the Milky Way halo on a particular dark matter candidate, the sterile neutrino, by an order of magnitude. We also study high resolution x-ray grating spectra of a cluster of galaxies. Based on these conservative constraints obtained from cosmic x-ray observations alone, the low mass (m s & 10 keV) and low mixing angle (sin 2 2 & 10 ÿ6 ) sterile neutrino is still a viable dark matter candidate.

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Weak Gravitational Lensing by a Sample of X‐Ray Luminous Clusters of Galaxies. I. The Data Set

Cited by 141 publications

References 64 publications

Radio halos in nearby (z < 0.4) clusters of galaxies

Radio halos in nearby (z < 0.4) clusters of galaxies

153 MHz GMRT follow-up of steep-spectrum diffuse emission in galaxy clusters

Probing the nature of dark matter with cosmic x rays: Constraints from “dark blobs” and grating spectra of galaxy clusters

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