SIMBAD references

2014ApJ...786L..17V - Astrophys. J., 786, L17 (2014/May-2)

A distant radio mini-halo in the Phoenix galaxy cluster.

VAN WEEREN R.J., INTEMA H.T., LAL D.V., ANDRADE-SANTOS F., BRUGGEN M., DE GASPERIN F., FORMAN W.R., HOEFT M., JONES C., NUZA S.E., ROTTGERING H.J.A. and STROE A.

Abstract (from CDS):

We report the discovery of extended radio emission in the Phoenix cluster (SPT-CL J2344-4243, z = 0.596) with the Giant Metrewave Radio Telescope (GMRT) at 610 MHz. The diffuse emission extends over a region of at least 400-500 kpc and surrounds the central radio source of the Brightest Cluster Galaxy, but does not appear to be directly associated with it. We classify the diffuse emission as a radio mini-halo, making it the currently most distant mini-halo known. Radio mini-halos have been explained by synchrotron emitting particles re-accelerated via turbulence, possibly induced by gas sloshing generated from a minor merger event. Chandra observations show a non-concentric X-ray surface brightness distribution, which is consistent with this sloshing interpretation. The mini-halo has a flux density of 17±5 mJy, resulting in a 1.4 GHz radio power of (10.4±3.5)x1024 W/Hz. The combined cluster emission, which includes the central compact radio source, is also detected in a shallow GMRT 156 MHz observation and together with the 610 MHz data we compute a spectral index of -0.84±0.12 for the overall cluster radio emission. Given that mini-halos typically have steeper radio spectra than cluster radio galaxies, this spectral index should be taken as an upper limit for the mini-halo.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: SPT-CL J2344-4243 - galaxies: clusters: intracluster medium - large-scale structure of universe - radiation mechanisms: non-thermal - X-rays: galaxies: clusters

Simbad objects: 4

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2019.10.14-23:54:21

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