Diffuse galaxy cluster emission at 168 MHz within the Murchison Widefield Array Epoch of Reionization 0-hour field-猫眼课题宝

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2017-07

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arXiv: Cosmology and Nongalactic Astrophysics

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S. Duchesne;M. Johnston-Hollitt;A. Offringa;G. Pratt;Q. Zheng;S. D. V. U. O. Wellington;N. Zealand.;Peripety Scientific Ltd.;N. F. F. R. Astronomy-N.-F.-F.-R.-Astronomy-103039809;The Netherlands.;S. D. -. C. -. Irfu-S.-D.-.-C.-.-Irfu-2264875468;France

我们探测和描述了168 MHz星系团在再电离0小时场期内的扩展的漫射射电辐射；南部天空中的一个$45^\circ\x 45^\circ$区域的中心是R.A.$=0^\cic$，decl。$=-27^\circ$。我们探测了31个弥散射电源，其中3个是在Abell 0141、Abell 2811和Abell S1121中新探测到的晕；2个新探测到的遗迹在Abell 0033和Abell 2751中；5个新的晕候选者和另外5个新的遗迹候选者。此外，我们在Abell 2556中发现了一个新的菲尼克斯候选星系，以及在Abell 0122和Abell S1136中心的两个候选死亡射电星系，这些星系可能与最亮的星系团星系有关。除此之外，我们发现两个星系团具有无法分类的弥散陡峭光谱发射，以及与RXC J2351.0-1934相关的候选双遗迹系统。我们给出了测量的源特性，如它们的积分通量密度、光谱指数和可能的大小。我们发现有几个扩散源是超陡峭的，包括Abell 0141中的晕，它有$\α\leq-2.1\pm 0.1$，使其成为已知的最陡峭的晕之一。最后，我们将我们的晕样本与以前探测到的晕进行了比较，并重新建立了射电晕功率($P1.4}$)与星团X射线光度($L{MATHROM{X}}$)和质量($M500}$)之间的标度关系。对于假定的幂定律关系，我们找到了一致的拟合参数，并发现尽管$P1.4}-L{X}}$测量不均匀，但$P1.4}-L{X}$比相应的$P{1.4}-M500}$具有更小的原始散射。这些比例关系属性与只有托管射电晕的非冷核心星系团的样本是一致的。

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.

Diffuse galaxy cluster emission at 168 MHz within the Murchison Widefield Array Epoch of Reionization 0-hour field

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