SIMBAD references

2017MNRAS.467..936G - Mon. Not. R. Astron. Soc., 467, 936-949 (2017/May-1)

A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array.

GEORGE L.T., DWARAKANATH K.S., JOHNSTON-HOLLITT M., INTEMA H.T., HURLEY-WALKER N., BELL M.E., CALLINGHAM J.R., FOR B.-Q., GAENSLER B., HANCOCK P.J., HINDSON L., KAPINSKA A.D., LENC E., McKINLEY B., MORGAN J., OFFRINGA A., PROCOPIO P., STAVELEY-SMITH L., WAYTH R.B., WU C. and ZHENG Q.

Abstract (from CDS):

We have studied radio haloes and relics in nine merging galaxy clusters using the Murchison Widefield Array (MWA). The images used for this study were obtained from the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey which was carried out at five frequencies, viz. 88, 118, 154, 188 and 215 MHz. We detect diffuse radio emission in eight of these clusters. We have estimated the spectra of haloes and relics in these clusters over the frequency range 80-1400 MHz; the first such attempt to estimate their spectra at low frequencies. The spectra follow a power law with a mean value of α = -1.13 ± 0.21 for haloes and α = -1.2 ± 0.19 for relics, where S ∝ να. We reclassify two of the cluster sources as radio galaxies. The low-frequency spectra are thus an independent means of confirming the nature of cluster sources. Five of the nine clusters host radio haloes. For the remaining four clusters, we place upper limits on the radio powers of possible haloes in them. These upper limits are a factor of 2-20 below those expected from the LX-P1.4 relation. These limits are the lowest ever obtained and the implications of these limits to the hadronic model of halo emission are discussed.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): radiation mechanisms: non-thermal - techniques: interferometric - galaxies: clusters: general - galaxies: clusters: intracluster medium - radio continuum: general - X-rays: galaxies: clusters - X-rays: galaxies: clusters

Nomenclature: Tables 3-4: [GDJ2017] A13 A (Nos H and R), [GDJ2017] A548b A (Nos A-B,H), [GDJ2017] A2063 A (Nos H and R), [GDJ2017] A2163 A (Nos H and R), [GDJ2017] A2254 H N=1, [GDJ2017] A2345 A(W) (Nos R(E), R(W) and H), [GDJ2017] A2744 A (Nos H and R), [GDJ2017] PLCK G287.0+32.9 H, [GDJ2017] PLCK G287.0+32.9 A(WW) (Nos R(SE), R(NW) and H), [GDJ2017] RXC J1314.5-2515 A(W) (Nos R(E), R(W) and H).

Status in Simbad:  being processed

Simbad objects: 16

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2019.12.14-22:41:49

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