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Article overview
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Discovery of a giant radio halo in a new Planck galaxy cluster PLCKG171.9-40.7 | | Simona Giacintucci
; Ruta Kale
; Daniel R. Wik
; Tiziana Venturi
; Maxim Markevitch
; | | Date: |
1 Feb 2013 | | Abstract: | We report the discovery of a giant radio halo in a new, hot, X-ray luminous
galaxy cluster recently found by Planck, PLCKG171.9-40.7. The radio halo was
found using Giant Metrewave Radio Telescope observations at 235 MHz and 610
MHz, and in the 1.4 GHz data from a NRAO Very Large Array Sky Survey pointing
that we have reanalyzed. The diffuse radio emission is coincident with the
cluster X-ray emission, has an extent of ~1 Mpc and a radio power of ~5x 10^24
W/Hz at 1.4 GHz. Its integrated radio spectrum has a slope of alpha~1.8 between
235 MHz and 1.4 GHz, steeper than that of a typical giant halo. The analysis of
the archival XMM-Newton X-ray data shows that the cluster is hot (~10 keV) and
disturbed, consistent with X-ray selected clusters hosting radio halos. This is
the first giant radio halo discovered in one of the new clusters found by
Planck. | | Source: | arXiv, 1302.0218 | | Services: | Forum | Review | PDF | Favorites | |
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