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LOFAR Detection of 110-188MHz emission and frequency-dependent activity from FRB20180916B

Pleunis, Z. (author)
McGill University
Michilli, D. (author)
McGill University
Bassa, C. G. (author)
Netherlands Institute for Radio Astronomy (ASTRON)
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Hessels, J. W. T. (author)
Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Van Amsterdam,University of Amsterdam
Naidu, A. (author)
University Of Oxford
Andersen, B. (author)
McGill University
Chawla, P. (author)
McGill University
Fonseca, E. (author)
West Virginia University,McGill University
Gopinath, A. (author)
Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Van Amsterdam,University of Amsterdam
Kaspi, V. M. (author)
McGill University
Kondratiev, V. I. (author)
Netherlands Institute for Radio Astronomy (ASTRON),Russian Academy of Sciences
Li, D. Z. (author)
University of Toronto,Institut canadien d'astrophysique théorique,Canadian Institute for Theoretical Astrophysics
Bhardwaj, M. (author)
McGill University
Boyle, P. J. (author)
McGill University
Brar, C. (author)
McGill University
Cassanelli, T. (author)
University of Toronto
Gupta, Y. (author)
National Centre for Radio Astrophysics India
Josephy, A. (author)
McGill University
Karuppusamy, R. (author)
Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
Keimpema, A. (author)
JOINT INSTITUTE FOR V.L.B.I. IN EUROPE (J.I.V.E.),Joint Institute for Very Long Baseline Interferometry European Research Infrastructure Consortium (JIVE)
Kirsten, Franz, 1983 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Leung, C. (author)
Massachusetts Institute of Technology (MIT)
Marcote, B. (author)
JOINT INSTITUTE FOR V.L.B.I. IN EUROPE (J.I.V.E.),Joint Institute for Very Long Baseline Interferometry European Research Infrastructure Consortium (JIVE)
Masui, K. (author)
Massachusetts Institute of Technology (MIT)
Mckinven, R. (author)
University of Toronto
Meyers, B. W. (author)
University of British Columbia (UBC)
Ng, C. (author)
University of Toronto
Nimmo, K. (author)
Universiteit Van Amsterdam,University of Amsterdam,Netherlands Institute for Radio Astronomy (ASTRON)
Paragi, Z. (author)
JOINT INSTITUTE FOR V.L.B.I. IN EUROPE (J.I.V.E.),Joint Institute for Very Long Baseline Interferometry European Research Infrastructure Consortium (JIVE)
Rahman, M. (author)
University of Toronto
Scholz, P. (author)
University of Toronto
Shin, K. (author)
Massachusetts Institute of Technology (MIT)
Smith, K. M. (author)
Perimeter Institute for Theoretical Physics
Stairs, I. H. (author)
University of British Columbia (UBC)
Tendulkar, S. P. (author)
National Centre for Radio Astrophysics India,Tata Institute of Fundamental Research
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 (creator_code:org_t)
2021-04-09
2021
English.
In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8213 .- 2041-8205. ; 911:1
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The object FRB 20180916B is a well-studied repeating fast radio burst source. Its proximity (∼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 freëCfree 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 (∼40-160 ms at 150 MHz) and lower linear polarization fractions are likely due to scattering. We find ∼2-3 rad m 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.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

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