Academic Journal
A southern-hemisphere all-sky radio transient monitor for SKA-Low prototype stations
| العنوان: | A southern-hemisphere all-sky radio transient monitor for SKA-Low prototype stations |
|---|---|
| المؤلفون: | Sokolowski, M., Wayth, R. B., Bhat, N. D. R., Price, D., Broderick, J. W., Bernardi, G., Bolli, P., Chiello, R., Comoretto, G., Crosse, B., Davidson, D. B., Macario, G., Magro, Alessio, Mattana, A., Minchin, D., McPhail, A., Monari, J., Perini, J., Pupillo, G., Sleap, G., Tingay, S., Ung, D., Williams, A. |
| بيانات النشر: | Cambridge University Press |
| سنة النشر: | 2021 |
| المجموعة: | University of Malta: OAR@UM / L-Università ta' Malta |
| مصطلحات موضوعية: | Interferometers, Radio telescopes, Pulsars, Radio astronomy |
| الوصف: | We present the first Southern-Hemisphere all-sky imager and radio-transient monitoring system implemented on two prototype stations of the low-frequency component of the Square Kilometre Array (SKA-Low). Since its deployment, the system has been used for real-time monitoring of the recorded commissioning data. Additionally, a transient searching algorithm has been executed on the resulting all-sky images. It uses a difference imaging technique to enable identification of a wide variety of transient classes, ranging from human-made radio-frequency interference to genuine astrophysical events. Observations at the frequency 159.375 MHz and higher in a single coarse channel (0.926 MHz) were made with 2 s time resolution, and multiple nights were analysed generating thousands of images. Despite having modest sensitivity ( few Jy beam–1), using a single coarse channel and 2-s imaging, the system was able to detect multiple bright transients from PSR B0950+08, proving that it can be used to detect bright transients of an astrophysical origin. The unusual, extreme activity of the pulsar PSR B0950+08 (maximum flux density 155 Jy beam–1) was initially detected in a ‘blind’ search in the 2020 April 10/11 data and later assigned to this specific pulsar. The limitations of our data, however, prevent us from making firm conclusions of the effect being due to a combination of refractive and diffractive scintillation or intrinsic emission mechanisms. The system can routinely collect data over many days without interruptions; the large amount of recorded data at 159.375 and 229.6875 MHz allowed us to determine a preliminary transient surface density upper limit of 1.32 x10-9deg-2 for a timescale and limiting flux density of 2 s and 42 Jy, respectively. In the future, we plan to extend the observing bandwidth to tens of MHz and improve time resolution to tens of milliseconds in order to increase the sensitivity and enable detections of fast radio bursts below 300 MHz. ; peer-reviewed |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | Sokolowski, M., Wayth, R. B., Bhat, N. D. R., Price, D., Broderick, J. W., Bernardi, G.,…Williams, A. (2021). A southern-hemisphere all-sky radio transient monitor for SKA-Low prototype stations. Publications of the Astronomical Society of Australia, 38, e023.; https://www.um.edu.mt/library/oar/handle/123456789/102751 |
| DOI: | 10.1017/pasa.2021.16 |
| الاتاحة: | https://www.um.edu.mt/library/oar/handle/123456789/102751 https://doi.org/10.1017/pasa.2021.16 |
| Rights: | info:eu-repo/semantics/restrictedAccess ; The copyright of this work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder. |
| رقم الانضمام: | edsbas.9C95508D |
| قاعدة البيانات: | BASE |
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