We have used the upgraded Giant Metrewave Radio Telescope to map the Coma cluster of galaxies at 250–500 MHz and 1050–1450 MHz bands. These 6.″26 and 2.″18 resolutions observations allow detailed radio structures to be determined of all detected radio sources that show both discrete pointlike and extended morphologies. We present images of a subset of 32 brightest ( S ν ≳ 30 mJy) and dominant sources, and several sources show discrete pointlike radio morphologies. We find the steepening of the spectra consistent with synchrotron cooling in the majority of sources and the median for spectral indices is −0.78, suggesting that ∼59% sources have steep spectra. The nature and the statistical properties of the radio sources in the Coma cluster will be discussed in subsequent papers.

中文翻译：

---

升级的GMRT观测星系昏迷星系：观测

我们已经使用升级后的巨型海浪射电望远镜绘制了250–500 MHz和1050–1450 MHz频段的昏迷星系图。这些6.“ 26和2.” 18“分辨率观察结果可以确定所有检测到的无线电源的详细无线电结构，这些无线电源既显示离散的点状形态又显示扩展的形态。我们展示了32个最亮（Sν≳30 mJy）和主要来源的子集的图像，几个来源显示了离散的点状无线电形态。我们发现，在大多数辐射源中，与同步加速器冷却相一致的光谱变陡，光谱指数的中位数为-0.78，这表明约59％的辐射源具有陡峭的光谱。随后的论文将讨论昏迷星团中无线电源的性质和统计特性。