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Multiwavelength Radio Observations of Two Repeating Fast Radio Burst Sources: FRB 121102 and FRB 180916.J0158+65

Pearlman, Aaron B. and Majid, Walid A. and Prince, Thomas A. and Nimmo, Kenzie and Hessels, Jason W. T. and Naudet, Charles J. and Kocz, Jonathon (2020) Multiwavelength Radio Observations of Two Repeating Fast Radio Burst Sources: FRB 121102 and FRB 180916.J0158+65. Astrophysical Journal Letters, 905 (2). Art. No. L27. ISSN 2041-8213. doi:10.3847/2041-8213/abca31.

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The spectra of fast radio bursts (FRBs) encode valuable information about the source's local environment, underlying emission mechanism(s), and the intervening media along the line of sight. We present results from a long-term multiwavelength radio monitoring campaign of two repeating FRB sources, FRB 121102 and FRB 180916.J0158+65, with the NASA Deep Space Network (DSN) 70 m radio telescopes (DSS-63 and DSS-14). The observations of FRB 121102 were performed simultaneously at 2.3 and 8.4 GHz, and spanned a total of 27.3 hr between 2019 September 19 and 2020 February 11. We detected two radio bursts in the 2.3 GHz frequency band from FRB 121102, but no evidence of radio emission was found at 8.4 GHz during any of our observations. We observed FRB 180916.J0158+65 simultaneously at 2.3 and 8.4 GHz, and also separately in the 1.5 GHz frequency band, for a total of 101.8 hr between 2019 September 19 and 2020 May 14. Our observations of FRB 180916.J0158+65 spanned multiple activity cycles during which the source was known to be active and covered a wide range of activity phases. Several of our observations occurred during times when bursts were detected from the source between 400 and 800 MHz with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) radio telescope. However, no radio bursts were detected from FRB 180916.J0158+65 at any of the frequencies used during our observations with the DSN radio telescopes. We find that FRB 180916.J0158+65's apparent activity is strongly frequency-dependent due to the narrowband nature of its radio bursts, which have less spectral occupancy at high radio frequencies (≳ 2 GHz). We also find that fewer or fainter bursts are emitted from the source at high radio frequencies. We discuss the implications of these results for possible progenitor models of repeating FRBs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Pearlman, Aaron B.0000-0002-8912-0732
Majid, Walid A.0000-0002-4694-4221
Prince, Thomas A.0000-0002-8850-3627
Nimmo, Kenzie0000-0003-0510-0740
Hessels, Jason W. T.0000-0003-2317-1446
Naudet, Charles J.0000-0001-6898-0533
Kocz, Jonathon0000-0003-0249-7586
Additional Information:© 2020 The American Astronomical Society. Received 2020 September 28; revised 2020 November 11; accepted 2020 November 13; published 2020 December 21. We thank Professor Vicky Kaspi and the CHIME/FRB collaboration for their support of these observations and for providing the CHIME/FRB data used in Figure 3. We also thank the reviewer for valuable comments and suggestions. A.B.P. acknowledges support by the Department of Defense (DoD) through the National Defense Science and Engineering Graduate (NDSEG) Fellowship Program and by the National Science Foundation (NSF) Graduate Research Fellowship under Grant No. DGE-1144469. J.W.T.H. acknowledges funding from an NWO Vici fellowship. We thank the Jet Propulsion Laboratory's Spontaneous Concept Research and Technology Development program for supporting this work. We also thank Dr. Stephen Lichten for providing programmatic support. In addition, we are grateful to the DSN scheduling team (Hernan Diaz, George Martinez, and Carleen Ward) and the GDSCC and MDSCC operations staff for scheduling and carrying out these observations. A portion of this research was performed at the Jet Propulsion Laboratory, California Institute of Technology and the Caltech campus, under a Research and Technology Development Grant through a contract with the National Aeronautics and Space Administration. U.S. government sponsorship is acknowledged.
Group:Astronomy Department
Funding AgencyGrant Number
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
NSF Graduate Research FellowshipDGE-1144469
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
JPL Research and Technology Development FundUNSPECIFIED
Subject Keywords:Radio transient sources ; Radio bursts
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Radio transient sources (2008); Radio bursts (1339)
Record Number:CaltechAUTHORS:20201019-093428722
Persistent URL:
Official Citation:Aaron B. Pearlman et al 2020 ApJL 905 L27
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106137
Deposited By: Tony Diaz
Deposited On:20 Oct 2020 17:59
Last Modified:16 Nov 2021 18:50

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