Cluster-subcluster mergers and the formation of narrow-angle tailed radio sources

Bliton, M.; Rizza, E.; Burns, Jack O.; Owen, F. N.; Ledlow, Michael J.

doi:10.1046/j.1365-8711.1998.01973.x

Cited by 67 publications

(72 citation statements)

References 93 publications

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“…According to Bliton et al (1998), the clusters containing narrow-angle tailed radio galaxies are in general dynamically complex systems udergoing merger events. Actually, structure and other merger signatures have been detected in all the clusters of Table 3 (e.g.…”

Section: Discussionmentioning

confidence: 99%

Halo and relic sources in clusters of galaxies

2000

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New images of 7 radio halos and relics, obtained with the Very Large Array at 20 or 90 cm, are presented here. The existence of a cluster-wide radio halo in the clusters A 665 and CL 0016+16 is confirmed. Both these clusters share the properties of the other clusters with radio halos, i.e. are luminous in X-rays, have high temperature, and show recent merger processes. No diffuse sources are detected in a sample of clusters showing at least a tailed radio galaxy within 300 kpc from the cluster center, indicating that the connection between tailed radio galaxies and halos is not relevant. For these clusters we give limits to the surface brightness and to the angular size of possible undetected diffuse sources. : 98.65.Cw; 98.65.Hb; 98.70.Dk; 98.70.Qy PACS

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Section: Discussionmentioning

confidence: 99%

Halo and relic sources in clusters of galaxies

2000

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“…This cluster is a binary cluster with two main condensations visible in the X-ray images. This cluster exhibits very clumpy, elongated X-ray emission, and a strong X-ray centroid shift (Bliton et al 1998). This elongation is also present in the galaxy distribution, which shows a definite ellipticity, oriented mainly E − W (Flin et al 1995).…”

Section: Notes On Individual Sourcesmentioning

confidence: 97%

Parsec-scale properties of brightest cluster galaxies

Liuzzo

Giovannini

Giroletti³

et al. 2010

A&A

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We present new VLBI observations at 5 GHz of a complete sample of brightest cluster galaxies (BCGs) in nearby Abell clusters (distance class <3). Combined with data from the literature, we provide parsec-scale information for 34 BCGs. Our analysis of the parsec-scale radio emission of BCGs and the cluster X-ray properties finds a possible dichotomy between BCGs in cool-core clusters and those in non-cool-core clusters. Among resolved sources, those in cool-core clusters tend to have two-sided parsec-scale jets, while those in less relaxed clusters have predominantly one-sided parsec-scale jets. We suggest that this difference is caused by the interplay between the jets and the surrounding medium. The one-sided structure in non-cool-core clusters may be due to Doppler boosting effects in relativistic, intrinsically symmetric jets whereas two-sided morphology in cool core clusters is probably related to the presence of heavy and mildly relativistic jets that have been decelerated on the parsec-scale. Evidence of recurrent activity is also found in BCGs in cool-core clusters.

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“…Both observations (e.g., Bliton et al 1998 ;Owen et al 1999 ;Markevitch et al 2000) and simulations (e.g., Roettiger, Loken, & Burns 1997 ;Roettiger, Stone, & Burns 1999 ;Bekki 1999) show that merging dramatically changes the physical characteristics of the intracluster medium (ICM) and galaxies, such as the temperature, density, and magnetic Ðeld strength of the ICM, and the star formation rate and radio emission of galaxies. However, many processes related to the mergers and their e †ects are still vague.…”

Section: Introductionmentioning

confidence: 99%

ChandraObservation of A2256: A Cluster at the Early Stage of Merging

Sun

Murray

Markevitch

et al. 2002

ApJ

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We present Chandra observations of the rich cluster of galaxies A2256. In addition to the known cool subcluster, a new structure (we call it the "" shoulder ÏÏ in this paper, based on its morphology) was resolved 2@ east of the peak of the main cluster. It is shown as a localized feature embedded in the main cluster. Its position is roughly at the center of a low-brightness radio relic. Spectral analysis shows that the shoulder has a high iron abundance, D1 (after the decomposition). The gas mass within it is around 2 ] 1011We suggest that this structure is either another merging component or an internal struc-M _ . ture of the main cluster. The previously known subcluster has a low temperature (D4.5 keV) and high iron abundance (D0.6) in the central 150 kpc. The main cluster has a temperature of 7È8 keV and an iron abundance of 0.2È0.3 around the center. The Chandra image shows a relatively sharp brightness gradient at the south of the subcluster peak running south-southeast. A temperature jump was found across the edge, with lower temperature inside the subcluster. This phenomenon is qualitatively similar to the "" cold fronts ÏÏ found in A2142 and A3667. While a simple interpretation is not possible because of the projection, the edge indicates relative motion and contact of the two gas clouds. The Chandra temperature map shows only moderate temperature variations across the cluster, but not as strong as those expected in a major merger. If the shoulder is ignored, the temperature map resembles simulations at the early stage of merging while the subcluster approached the main cluster from somewhere west. The observed temperature map and the edgelike feature near the south of the subcluster imply that the ongoing merger is still at the early stage. The X-ray redshifts of several regions were measured. The results are consistent with a single value and all agree with the optical value. At least three member galaxies, including a radio head-tail galaxy, were found to have corresponding X-ray emission, with X-ray luminosity from several times 1040 to 1041 ergs s~1. We Ðnd that the observed characteristics (temperature and iron abundance gradient) of the subcluster are similar to those of some poor clusters. The absence of galaxies around the peak of the subcluster is proposed to be the result of di †erent falling velocities of the galaxies and the core gas.

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Cluster-subcluster mergers and the formation of narrow-angle tailed radio sources

Cited by 67 publications

References 93 publications

Halo and relic sources in clusters of galaxies

Halo and relic sources in clusters of galaxies

Parsec-scale properties of brightest cluster galaxies

ChandraObservation of A2256: A Cluster at the Early Stage of Merging

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