Image plane detection of FRB121102 with the MeerKAT radio telescope

被引：0
|
作者：
Andrianjafy, J. C. [1 ]
Heeralall-Issur, N. [1 ]
Deshpande, A. A. [2 ,3 ,4 ]
Golap, K. [5 ]
Woudt, P. [6 ]
Caleb, M. [7 ,8 ]
Barr, E. D. [9 ]
Chen, W. [9 ]
Jankowski, F. [10 ]
Kramer, M. [9 ,10 ]
Stappers, B. W. [10 ]
Wu, J. [9 ]
机构：
[1] Univ Mauritius, Dept Phys, Reduit 80837, Mauritius
[2] Raman Res Inst, Dept Astron & Astrophys, Bangalore 560080, India
[3] Interuniv Ctr Astron & Astrophys, Pune 411007, India
[4] Indian Inst Technol, Dept Space Sci & Astron, Kanpur 208016, India
[5] Natl Radio Astron Observ, POB O, Socorro, NM 87801 USA
[6] Univ Cape Town, Dept Astron, Private Bag X3, ZA-7701 Rondebosch, South Africa
[7] Univ Sydney, Sydney Inst Astron, Sch Phys, Sydney, NSW 2006, Australia
[8] ARC Ctr Excellence All Sky Astrophys 3D, ASTRO3D, Canberra, ACT 2601, Australia
[9] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
[10] Univ Manchester, Dept Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, England
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 518卷 / 03期
基金：
欧洲研究理事会; 澳大利亚研究理事会; 英国科学技术设施理事会;
关键词：
instrumentation: interferometers; techniques: image processing; radio continuum: transients; BURST FRB 121102; CALIBRATION; TRANSIENTS; DISCOVERY; ALGORITHM;
D O I：
10.1093/mnras/stac3348
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the analysis of radio interferometric 2-s images from a MeerKAT observation of the repeating fast radio burst FRB121102 in 2019 September, during which 11 distinct pulses have been previously detected using high time and frequency resolution data cubes. In this work, we detected 6 out of the 11 bursts in the image plane at 1.48 GHz with a minimum peak signal-to-noise ratio (S/N) of 5 sigma and a fluence detection limit of similar to 0.512 Jy ms. These constitute the first detections of a fast radio burst (FRB) or a radio transient using 2-s time-scale images with MeerKAT data. Analysis of the fitted burst properties revealed a weighted average precision of similar to 1 arcsec in the localization of the bursts. The accurate knowledge of FRB positions is essential for identifying their host galaxy and understanding their mysterious nature that is still unresolved to this day. We also produced 2-s images at 1.09 GHz but yielded no detection that we attributed to the spectral structure of the pulses that are mostly higher in strength in the upper frequencies. We also explore a new approach to difference image analysis (DIA) to search for transients and find that our technique has the potential to reduce the number of candidates and could be used to automate the detection of FRBs in the image plane for future MeerKAT observations.
引用
收藏
页码：3462 / 3474
页数：13
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