澳大利亚望远镜紧凑阵列宽带后端（CABB）
The Australia Telescope Compact Array Broadband Backend (CABB)
摘要：
在这里，我们描述了紧凑阵列宽带后端（CABB）和目前的第一个结果与升级后的澳大利亚望远镜紧凑阵列（ATCA）。观测带宽增加了16倍，从2 x 128 MHz增加到2 x 2048 MHz，高位采样，增加了16个变焦窗口（每个窗口又分为2048个通道），为所有ATCA观测提供了重大改进。新系统的好处是：（1）极大地提高了无线电连续谱和偏振灵敏度以及图像保真度，（2）大大提高了在大速度范围内搜索和绘制发射和吸收谱线的能力，（3）同时进行多谱线和连续谱观测，（4）由于高位采样而提高了灵敏度、测量速度和动态范围，以及（5）高速度分辨率，同时保持全偏振输出。新的CABB系统鼓励所有观察者利用谱线和连续谱数据来充分发挥其潜力。鉴于ATCA在所有频段（从1.1到105 GHz）的能力急剧增加，CABB使升级前不可行的科学项目成为可能，例如同时观测多条谱线，实时测绘，快速跟踪无线电瞬变（例如，新超新星的射电余辉）和高速度分辨率和全偏振的脉泽观测。这里展示的第一批科学成果包括宽带光谱、高动态范围图像和偏振测量，突出了ATCA的能力和发现潜力。
英文摘要：
Here we describe the Compact Array Broadband Backend (CABB) and present first results obtained with the upgraded Australia Telescope Compact Array (ATCA). The 16-fold increase in observing bandwidth, from 2 x 128 MHz to 2 x 2048 MHz, high bit sampling, and addition of 16 zoom windows (each divided into a further 2048 channels) provide major improvements for all ATCA observations. The benefits of the new system are: (1) hugely increased radio continuum and polarization sensitivity as well as image fidelity, (2) substantially improved capability to search for and map emission and absorption lines over large velocity ranges, (3) simultaneous multi-line and continuum observations, (4) increased sensitivity, survey speed and dynamic range due to high-bit sampling, and (5) high velocity resolution, while maintaining full polarization output. The new CABB system encourages all observers to make use of both spectral line and continuum data to achieve their full potential. Given the dramatic increase of the ATCA capabilities in all bands (ranging from 1.1 to 105 GHz) CABB enables scientific projects that were not feasible before the upgrade, such as simultaneous observations of multiple spectral lines, on-the-fly mapping, fast follow-up of radio transients (e.g., the radio afterglow of new supernovae) and maser observations at high velocity resolution and full polarization. The first science results presented here include wide-band spectra, high dynamic-range images, and polarization measurements, highlighting the increased capability and discovery potential of the ATCA.
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