A sample of fast radio bursts discovered and localized with MeerTRAP at the MeerKAT telescope

被引：18

作者：

Jankowski, F. ^{[1
,2
]}

Bezuidenhout, M. C. ^{[1
,3
]}

Caleb, M. ^{[1
,4
,5
]}

Driessen, L. N. ^{[1
,6
]}

Malenta, M. ^{[1
]}

Morello, V ^{[1
]}

Rajwade, K. M. ^{[1
,7
]}

Sanidas, S. ^{[1
]}

Stappers, B. W. ^{[1
]}

Surnis, M. P. ^{[1
,8
]}

Barr, E. D. ^{[9
]}

Chen, W. ^{[9
]}

Kramer, M. ^{[1
,9
]}

Wu, J. ^{[9
]}

Buchner, S. ^{[10
]}

Serylak, M. ^{[11
]}

Prochaska, J. Xavier ^{[12
,13
]}

机构：

[1] Univ Manchester, Jodrell Bank Ctr Astrophys, Dept Phys & Astron, Manchester M13 9PL, England

[2] Univ Orleans, CNRS, LPC2E, 3A Ave Rech Sci, F-45071 Orleans, France

[3] North West Univ, Ctr Space Res, ZA-2531 Potchefstroom, South Africa

[4] Univ Sydney, Sydney Inst Astron, Sch Phys, Sydney, NSW 2006, Australia

[5] ASTRO3D ARC Ctr Excellence All Sky Astrophys 3D, Canberra, ACT 2601, Australia

[6] CSIRO, Space & Astron, POB 1130, Bentley, WA 6102, Australia

[7] Netherlands Inst Radio Astron, ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands

[8] IISER Bhopal, Dept Phys, Bhauri Bypass Rd, Bhopal 462066, India

[9] Max Planck Inst Radioastron, Auf Hugel 69, D-53121 Bonn, Germany

[10] South African Radio Astron Observ, Black River Pk,2 Fir St, ZA-7925 Cape Town, South Africa

[11] Sq Kilometre Array Observ, Macclesfield SK11 9FT, Cheshire, England

[12] Univ Calif Santa Cruz, 1156 High St, Santa Cruz, CA 95064 USA

[13] Kavli Inst Phys & Math Universe, 5-1-5 Kashiwanoha, Kashiwa 2778583, Japan

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 524卷 / 03期

基金：

澳大利亚研究理事会; 新加坡国家研究基金会; 美国国家科学基金会; 荷兰研究理事会; 欧洲研究理事会;

关键词：

radiation mechanisms: non-thermal; methods: data analysis; techniques: interferometric; fast radio bursts; REAL-TIME; SPECTRAL PROPERTIES; DISPERSION MEASURE; HOST GALAXY; PULSAR; SCATTERING; TRANSIENTS; SEARCH; II; DISTRIBUTIONS;

D O I：

10.1093/mnras/stad2041

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a sample of well-localized fast radio bursts (FRBs) discovered by the MeerTRAP project at the MeerKAT telescope in South Africa. We discovered the three FRBs in single coherent tied-array beams and localized them to an area of similar to 1 arcmin(2). We investigate their burst properties, scattering, repetition rates, and localizations in a multiwavelength context. FRB 20201211A shows hints of scatter broadening but is otherwise consistent with instrumental dispersion smearing. For FRB 20210202D, we discovered a faint post-cursor burst separated by similar to 200 ms, suggesting a distinct burst component or a repeat pulse. We attempt to associate the FRBs with host galaxy candidates. For FRB 20210408H, we tentatively (0.35-0.53 probability) identify a compatible host at a redshift similar to 0.5. Additionally, we analyse the MeerTRAP survey properties, such as the survey coverage, fluence completeness, and their implications for the FRB population. Based on the entire sample of 11 MeerTRAP FRBs discovered by the end of 2021, we estimate the FRB all-sky rates and their scaling with the fluence threshold. The inferred FRB all-sky rates at 1.28 GHz are 8.2(-4.6)(+8.0) and 2.1(-1.1)(+1.8) x 10(3) sky(-1) d(-1) above 0.66 and 3.44 Jy ms for the coherent and incoherent surveys, respectively. The scaling between the MeerTRAP rates is flatter than at higher fluences at the 1.4 sigma level. There seems to be a deficit of low-fluence FRBs, suggesting a break or turn-over in the rate versus fluence relation below 2 Jy ms. We speculate on cosmological or progenitor-intrinsic origins. The cumulative source counts within our surveys appear consistent with the Euclidean scaling.

引用

页码：4275 / 4295

页数：21

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