Explosions Near and Far: Transients with low frequency radio arrays

低频无线电阵列为探索太空打开了一扇新的窗户。 旨在最大限度地提高吞吐量，他们的调查速度和灵敏度，以找到大量的来源，在早期的研究缺席。他们可以系统地探测无线电天空中的瞬态和可变源，跟踪奇异的瞬态，同时表征已知源的行为。Murchison Widefield Array（MWA）和Australian Square Kilometer Array Pathfinder（ASKAP）是非常适合使用独特的检测策略来克服噪声环境来检测在亚秒时间尺度上发生的无线电发射的首要设施。检测到的瞬变将触发映射，以成像发射源，以定位和确定引起发射的发射机制。 有些将是已知的来源与无法解释的能量，而其他将是全新的来源。 该补助金资助威斯康星大学密尔沃基分校的博士后助理和本科生，他们将获得信号处理和分析大量数据的宝贵科学，技术，工程和数学（STEM）教育，这是当今的必要技能？软件产业。威斯康星大学密尔沃基分校？天文学俱乐部将通过让本科生参与这项研究来扩大其STEM活动。这项研究将使用MWA的能力？S和ASKAP？作为发现引擎，在天空成像调查中探测短持续时间（小于一秒）的瞬态事件和可变现象。MWA和ASKAP一起提供了强大的和互补的约束源？通过在无线电频率的八度范围内提供数据， 它将集中研究低质量恒星和太阳系外行星的发射机制，孤儿伽马射线爆发余辉，多波长到多信使的提示和相干发射与MWA和ASKAP的后期余辉，以及未知祖先的意外源/瞬变。克服背景辐射的检测策略将包括圆偏振检测和针对背景辐射的图像减法。 发现重大事件后，将在多个波长上进行测量。 该奖项反映了NSF的法定使命，并通过使用基金会的知识价值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.