Explosions Near and Far: Transients with low frequency radio arrays

低频无线电阵列正在为发现空间打开一扇新的窗口。为了最大限度地提高吞吐量，它们具有调查速度和灵敏度，可以找到早期研究中没有的大量来源。他们可以系统地探测无线电天空中的瞬变和变化源，跟踪奇异的瞬变，同时表征已知源的行为。Murchison Widefield阵列(MWA)和澳大利亚平方千米阵列探路器(ASKAP)是一流的设备，非常适合使用独特的检测策略来检测发生在亚秒级时间尺度上的无线电辐射，以克服噪声环境。检测到的瞬变将触发映射，以成像排放源，以定位和确定产生它的发射机制。有些将是未知能量的已知来源，而另一些将是全新的来源。这笔助学金资助威斯康星大学密尔沃基分校的一名博士后和本科生，他们将在信号处理和分析海量数据方面获得有价值的科学、技术、工程和数学(STEM)教育，这在当今的软件行业是一项必要的技能？S。威斯康星大学密尔沃基分校S天文俱乐部将通过邀请本科生参与这项研究来扩大其STEM活动。这项研究将利用MWA-S和ASKAP-S作为发现引擎来探测天空成像测量中持续时间短、不到一秒的瞬变事件和可变现象。MWA和ASKAP结合在一起，通过在无线电频率上提供一个倍频程的数据，提供了对源S天体物理的强大和互补的约束。它将重点研究低质量恒星和太阳系外行星的发射机制、孤儿伽马射线暴的余辉、多波长到多信使的快速和相干发射以及ASKAP的余辉后的时间，以及来自未知前体的意外来源/瞬变。克服背景辐射的检测策略将包括圆极化检测和针对背景辐射的图像减去。在发现重大事件之后，将在多个波长进行测量。如果什么都没有发现，将为未来的搜索建立重要的限制。这一裁决反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Low frequency radio arrays are opening up a new window in discovery space. Designed to maximize throughput, they have the survey speed and sensitivity to find a significant number of sources absent in earlier studies. They can systematically probe the radio sky for transient and variable sources, following up exotic transients while characterizing the behavior of known sources. The Murchison Widefield Array (MWA) and the Australian Square Kilometer Array Pathfinder (ASKAP) are premier facilities well suited for detecting radio emissions occurring on sub-second timescales using unique detection strategies to overcome noisy environments. Detected transients will trigger mapping to image the source of emission to locate and determine the emission mechanisms giving rise to it. Some will be known sources with unexplained energetics while others will be totally new sources. This grant funds a postdoctoral associate and undergraduate students at the University of Wisconsin-Milwaukee, who will gain valuable Science, Technology, Engineering and Mathematics (STEM) education in signal processing and analyzing massive amounts of data, which is a necessary skill in today?s software industry. The University of Wisconsin-Milwaukee?s Astronomy Club will expand its STEM activities by involving undergraduate students in this research. This research will use the abilities of the MWA?s and ASKAP?s as discovery engines to detect short duration, less than one second, transient events and variable phenomena in imaging surveys over the sky. Together MWA and ASKAP provide powerful and complementary constraints on source?s astrophysics by providing data over an octave in radio frequency. It will focus on the study of the emission mechanisms of low mass stars and extrasolar planets, orphan gamma-ray burst afterglows, multi-wavelength to multi-messenger prompt and coherent emission with MWA and late time after glows with ASKAP, as well as unexpected sources/transients from unknown progenitors. Detection strategies to overcome background emission will include circular polarization detection and image subtraction against background radiation. The discovery of significant events will be followed-up by measurements at multiple wavelengths. If nothing is discovered, significant limits will be established for future searches.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.