The Commensal Real-time ASKAP Fast Transient incoherent-sum survey
R. M. Shannon, K. W. Bannister, A. Bera, S. Bhandari, C. K. Day, A. T. Deller, T. Dial, D. Dobie, R. D. Ekers, W. -f. Fong, M. Glowacki, A. C. Gordon, K. Gourdj… 展开作者
R. M. Shannon, K. W. Bannister, A. Bera, S. Bhandari, C. K. Day, A. T. Deller, T. Dial, D. Dobie, R. D. Ekers, W. -f. Fong, M. Glowacki, A. C. Gordon, K. Gourdji, A. Jaini, C. W. James, P. Kumar, E. K. Mahony, L. Marnoch, A. R. Muller, J. X. Prochaska, H. Qiu, S. D. Ryder, E. M. Sadler, D. R. Scott, N. Tejos, P. A. Uttarkar, Y. Wang
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Accepted for publication in PASA. 36 pages, 23 Figures, 5 Tables
With wide-field phased array feed technology,the Australian Square Kilometre Array Pathfinder (ASKAP) is ideally suited to search for seemingly rare radio transient sources that are difficult to discover previous-generation narrow-field telescopes. The Commensal Real-time ASKAP Fast Transient (CRAFT) Survey Science Project has developed instrumentation to continuously search for fast radio transients (duration < 1 second) with ASKAP, with a particular focus on finding and localising Fast Radio Bursts (FRBs). Since 2018, the CRAFT survey has been searching for FRBs and other fast transients by incoherently adding the intensities received by individual ASKAP antennas, and then correcting for the impact of frequency dispersion on these short-duration signals in the resultant incoherent sum (ICS) in real-time. This low-latency detection enables the triggering of voltage buffers, which facilitates the localisation of the transient source and the study of spectro-polarimetric properties at high time resolution. Here we report the sample of 43 FRBs discovered in this CRAFT/ICS survey to date. This includes 22 FRBs that had not previously been reported: 16 FRBs localised by ASKAP to < 1 arcsec and 6 FRBs localised to ~ 10 arcmin. Of the new arcsecond-localised FRBs, we have identified and characterised host galaxies (and measured redshifts) for 11. The median of all 30 measured host redshifts from the survey to date is z=0.23. We summarise results from the searches, in particular those contributing to our understanding of the burst progenitors and emission mechanisms, and on the use of bursts as probes of intervening media. We conclude by foreshadowing future FRB surveys with ASKAP using a coherent detection system that is currently being commissioned. This will increase the burst detection rate by a factor of approximately ten and also the distance to which ASKAP can localise FRBs.
CRAFT HTR2: Polarimetry of 64 non-repeating fast radio bursts from the updated CRAFT catalogue
Swinburne University of Technology（斯威本科技大学）；University of Edinburgh（爱丁堡大学）；Curtin University（科廷大学）；University of Cape Town（开普敦大学）；ASTRON, Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）
Estimation of intrinsic fast radio burst width and scattering distributions from CRAFT data
International Centre for Radio Astronomy Research, Curtin University（国际无线电天文研究中心，科廷大学）；Department of Astronomy and Astrophysics, University of California, Santa Cruz（天文学与天体物理学系，加州大学圣克鲁兹分校）；Institute for Astronomy, University of Edinburgh, Royal Observatory（天文研究所，爱丁堡大学，皇家观测台）
Two new highly scattered fast radio bursts: evidence for scatter broadening by the circumsource medium
Swinburne University of Technology（斯威本科技大学）；Centre for Astrophysics and Supercomputing, Swinburne University of Technology（斯威本大学天体物理学与超级计算中心）；Australia Telescope National Facility, CSIRO, Space and Astronomy（CSIRO空间与天文澳大利亚望远镜国家设施）；Sydney Institute for Astronomy, School of Physics, The University of Sydney（悉尼大学物理学院悉尼天体物理学研究所）；OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery, Swinburne University of Technology（斯威本大学ARC引力波发现卓越研究中心）；China-Brazil Belt and Road Joint Laboratory on Radio Astronomy Technology（中巴“一带一路”射电天文技术联合实验室）；Institute for Astronomy, University of Edinburgh, Royal Observatory（爱丁堡大学皇家天文台天体物理研究所）；Inter-University Institute for Data Intensive Astronomy, Department of Astronomy, University of Cape Town（开普敦大学天文学系跨大学数据密集型天体物理研究所）；Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy, Northwestern University（西北大学天体物理学交叉探索与研究中心及物理与天文学系）
