期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 911, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8213/abec72
关键词
Radio transient sources; High energy astrophysics; Neutron stars
资金
- International LOFAR Telescope (ILT) [LC12_016, DDT12_001, LC13_016, DDT14_005]
- COM_ALERT
- CNRS-INSU
- Observatoire de Paris
- Universite d'Orleans, France
- BMBF, Germany
- MIWF-NRW, Germany
- MPG, Germany
- Science Foundation Ireland (SFI), Ireland
- Department of Business, Enterprise and Innovation (DBEI), Ireland
- NWO, the Netherlands
- Science and Technology Facilities Council, UK
- Canada Foundation for Innovation 2015 Innovation Fund [33213]
- Provinces of British Columbia and Quebec
- 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
- David Dunlap family
- University of Toronto
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research Innovation
- NWO Vici grant
- FRQNT Doctoral Research Award
- NSERC
- Gerhard Herzberg Award
- R. Howard Webster Foundation Fellowship from CIFAR
- FRQNT CRAQ
- Department of Atomic Energy, Government of India [12-RD-TFR-5.02-0700]
- Swedish Research Council
- U.S. Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
- Spanish Ministerio de Economia y Competitividad (MINECO) [AYA2016-76012-C3-1-P]
- Spanish Ministerio de Ciencia e Innovacion of ICCUB (Unidad de Excelencia Maria de Maeztu) [PID2019-105510GB-C31, CEX2019-000918-M]
- NSF Graduate Research Fellowship Program
- NSERC Discovery Grant
- Canadian Institute for Advance Research
- CFI John R. Evans Leaders Fund award
The study reports detections of 18 bursts from the well-studied FRB 20180916B, providing insights into its nature and offering stronger constraints on the optical depth in the source's local environment. Additionally, it is found that the burst activity is systematically delayed by about 3 days at lower frequencies, which may have implications for the source's activity cycle.
The object FRB 20180916B is a well-studied repeating fast radio burst source. Its proximity (similar to 150 Mpc), along with detailed studies of the bursts, has revealed many clues about its nature, including a 16.3 day periodicity in its activity. Here we report on the detection of 18 bursts using LOFAR at 110-188 MHz, by far the lowest-frequency detections of any FRB to date. Some bursts are seen down to the lowest observed frequency of 110 MHz, suggesting that their spectra extend even lower. These observations provide an order-of-magnitude stronger constraint on the optical depth due to free-free absorption in the source's local environment. The absence of circular polarization and nearly flat polarization angle curves are consistent with burst properties seen at 300-1700 MHz. Compared with higher frequencies, the larger burst widths (similar to 40-160 ms at 150 MHz) and lower linear polarization fractions are likely due to scattering. We find similar to 2-3 rad m(-2) variations in the Faraday rotation measure that may be correlated with the activity cycle of the source. We compare the LOFAR burst arrival times to those of 38 previously published and 22 newly detected bursts from the uGMRT (200-450 MHz) and CHIME/FRB (400-800 MHz). Simultaneous observations show five CHIME/FRB bursts when no emission is detected by LOFAR. We find that the burst activity is systematically delayed toward lower frequencies by about 3 days from 600 to 150 MHz. We discuss these results in the context of a model in which FRB 20180916B is an interacting binary system featuring a neutron star and high-mass stellar companion.
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