Explosions Near and Far: Transients with low frequency radio arrays

近处和远处的爆炸：低频无线电阵列的瞬变

• 批准号: 1816492
• 负责人: David Kaplan
• 金额: $ 49.34万
• 依托单位: University of Wisconsin-Milwaukee
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1816492&HistoricalAwards=false
• 关键词: Explosions; Near; Far; Transients; low

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.

低频无线电阵列正在发现发现空间中的新窗口。 它们旨在最大程度地提高吞吐量，具有调查速度和灵敏度，可以在早期的研究中找到大量资源。他们可以系统地探究无线电天空的瞬态和可变源，跟随外来瞬态，同时表征已知来源的行为。 Murchison Widefield阵列（MWA）和澳大利亚平方公里阵列探路者（ASKAP）是最适合使用独特的检测策略来检测在次秒时间尺度上发生的无线电排放的主要设施，以克服嘈杂的环境。检测到的瞬态将触发映射以成像放射源以定位并确定产生的发射机制。 有些人将是无法解释的能量学的已知来源，而另一些将是全新的资源。 这项赠款为威斯康星大学 - 米尔沃基大学的博士后同学和本科生提供了资金，他将在信号处理和分析大量数据中获得宝贵的科学，技术，工程和数学（STEM）教育，这是当今的Software Software行业的必要技能。威斯康星大学 - 米尔沃基大学的天文学俱乐部将通过参与本研究来扩大其STEM活动。这项研究将使用MWA和ASKAP的能力作为发现引擎，以检测短持续时间，少于一秒钟的瞬态事件和变化现象在天空上的成像调查中。 MWA和ASKAP一起通过在射频频率上提供数据来提供对源天体物理学的强大和互补的约束。 它将重点研究低质量恒星和极性行星的发射机制，孤儿伽玛射线爆发余气，多波长的多波长，到多通信器及时及时及时及其MWA的相干发射以及与ASKAP发光后的迟到，以及来自未知祖细胞的意外来源/瞬态。克服背景发射的检测策略将包括针对背景辐射的循环极化检测和图像减法。 在多个波长下的测量结果将进行重大事件的发现。 如果没有发现任何发现，将为将来的搜索建立重大限制。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的评论标准来评估值得支持的。

项目成果

ASKAP observations of multiple rapid scintillators reveal a degrees-long plasma filament

• DOI: 10.1093/mnras/stab139
• 发表时间: 2021-01
• 作者: Yuanming Wang;A. Tuntsov;T. Murphy;E. Lenc;M. Walker;K. Bannister;D. Kaplan;E. Mahony

A pilot ASKAP survey for radio transients towards the Galactic Centre

针对银河系中心的无线电瞬变进行 ASKAP 试点调查

• DOI: 10.1093/mnras/stac2542
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Wang, Ziteng;Murphy, Tara;Kaplan, David L.;Bannister, Keith W.;Lenc, Emil;Leung, James K.;O’Brien, Andrew;Pintaldi, Sergio;Pritchard, Joshua;Stewart, Adam J.
• 通讯作者: Stewart, Adam J.

A VOEvent-based automatic trigger system for the Murchison Widefield Array

• DOI: 10.1017/pasa.2019.40
• 发表时间: 2019-10
• 期刊: Publications of the Astronomical Society of Australia
• 影响因子: 6.3
• 作者: Paul J. Hancock;G. Anderson;A. Williams;M. Sokolowski;S. Tremblay;A. Rowlinson;B. Crosse;B. W. Meyers;Christene Lynch;A. Zic;A. Beardsley;D. Emrich;T. Franzen;L. Horsley;M. Johnston-Hollitt;D. Kaplan;D. Kenney;M. Morales;D. Pallot;K. Steele;S. Tingay;C. Trott;M. Walker;R. Wayth;Chen Wu

An optimised gravitational wave follow-up strategy with the Australian Square Kilometre Array Pathfinder

• DOI: 10.1017/pasa.2019.9
• 发表时间: 2019-03
• 期刊: Publications of the Astronomical Society of Australia
• 影响因子: 6.3
• 作者: D. Dobie;T. Murphy;D. Kaplan;S. Ghosh;K. Bannister;R. Hunstead

Discovery of PSR J0523-7125 as a Circularly Polarized Variable Radio Source in the Large Magellanic Cloud

• DOI: 10.3847/1538-4357/ac61dc
• 发表时间: 2022-05
• 期刊: The Astrophysical Journal
• 作者: Yuanming Wang;T. Murphy;D. Kaplan;Teresa Klinner-Teo;A. Ridolfi;M. Bailes;F. Crawford;S. Dai