http://arxiv.org/abs/1707.03517
We detect and characterise extended, diffuse radio emission from galaxy clusters at 168 MHz within the Epoch of Reionization 0-hour field; a $45^\circ \times 45^\circ$ region of the southern sky centred on R. A. $= 0^\circ$, decl. $=-27^\circ$. We detect 31 diffuse radio sources; 3 of which are newly detected haloes in Abell 0141, Abell 2811, and Abell S1121; 2 newly detected relics in Abell 0033 and Abell 2751; 5 new halo candidates and a further 5 new relic candidates. Further, we detect a new phoenix candidate in Abell 2556 as well as 2 candidate dead radio galaxies at the centres of Abell 0122 and Abell S1136 likely associated with the brightest cluster galaxies. Beyond this we find 2 clusters with unclassifiable, diffuse steep-spectrum emission as well as a candidate double relic system associated with RXC J2351.0-1934. We present measured source properties such as their integrated flux densities, spectral indices, and sizes where possible. We find several of the diffuse sources to be ultra-steep including the halo in Abell 0141 which has $\alpha \leq -2.1 \pm 0.1$ making it one of the steepest halos known. Finally, we compare our sample of haloes with previously detected haloes and revisit established scaling relations of the radio halo power ($P_{1.4}$) with the cluster X-ray luminosity ($L_{\mathrm{X}}$) and mass ($M_{500}$). We find consistent fitting parameters for assumed power law relationships, and find that the $P_{1.4}-L_{\mathrm{X}}$ has less raw scatter than the corresponding $P_{1.4}-M_{500}$ despite inhomogeneous $L_{\mathrm{X}}$ measurements. These scaling relation properties are consistent with a sample of only non-cool core clusters hosting radio haloes.
S. Duchesne, M. Johnston-Hollitt, A. Offringa, et. al.
Thu, 13 Jul 17
58/60
Comments: Submitted to MNRAS, 35 pages, 36 figures (comprised of 49 individual figure files)