期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 896, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ab96bf
关键词
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资金
- CFI Leading Edge Fund (2012) [31170]
- province British Columbia
- province Quebec
- province Ontario
- Canada Foundation for Innovation 2015 Innovation Fund [33213]
- Dunlap Institute for Astronomy and Astrophysics at the University of Toronto
- Canadian Institute for Advanced Research (CIFAR), McGill University
- McGill Space Institute via the Trottier Family Foundation
- University of British Columbia
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research Innovation
- International LOFAR Telescope (ILT) [DDT12_001]
- CNRS-INSU, France
- Observatoire de Paris, France
- Universite d'Orleans, France
- BMBF
- MIWF-NRW
- MPG, Germany
- Science Foundation Ireland (SFI)
- Department of Business, Enterprise and Innovation (DBEI), Ireland
- NWO, The Netherlands
- Science and Technology Facilities Council, UK
- Ministry of Science and Higher Education, Poland
- European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC [337062]
- FRQNT Doctoral Research Award
- Canada Research Chair
- NSERC
- R. Howard Webster Foundation Fellowship from the Canadian Institute for Advanced Research (CIFAR)
- FRQNT Centre de Recherche en Astrophysique du Quebec
- Schulich Graduate Fellowship
- David Dunlap family
- University of Toronto
- Canadian Institute for Advanced Research
- Killam Fellowship
- Canadian Institute for Advanced Research (CIFAR)
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2015-05948]
- Canada Research Chairs program
- NWO Vici fellowship
- Lorne Trottier Chair in Astrophysics Cosmology
We report on the detection of seven bursts from the periodically active, repeating fast radio burst (FRB) source FRB 180916.J0158+65 in the 300-4-00 MHz frequency range with the Green Bank Telescope (GBT). Emission in multiple bursts is visible down to the bottom of the GBT band, suggesting that the cutoff frequency (if it exists) for FRB emission is lower than 300 MHz. Observations were conducted during predicted periods of activity of the source, and had simultaneous coverage with the Low Frequency Array (LOFAR) and the FRB backend on the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope. We find that one of the GBT-detected bursts has potentially associated emission in the CHIME band (400-800 MHz) but we detect no bursts in the LOFAR band (110-190 MHz), placing a limit of alpha > -1.0 on the spectral index of broadband emission from the source. We also find that emission from the source is severely band-limited with burst bandwidths as low as similar to 40 MHz. In addition, we place the strictest constraint on observable scattering of the source, <1.7 ms at 350 MHz, suggesting that the circumburst environment does not have strong scattering properties. Additionally, knowing that the circumburst environment is optically thin to free-free absorption at 300 MHz, we find evidence against the association of a hyper-compact H II region or a young supernova remnant (age <50 yr) with the source.
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