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A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts

Majid, Walid A. and Pearlman, Aaron B. and Nimmo, Kenzie and Hessels, Jason W. T. and Prince, Thomas A. and Naudet, Charles J. and Kocz, Jonathon and Horiuchi, Shinji (2020) A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts. Astrophysical Journal Letters, 897 (1). Art. No. L4. ISSN 2041-8213. doi:10.3847/2041-8213/ab9a4a.

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The spectra of repeating fast radio bursts (FRBs) are complex and time-variable, sometimes peaking within the observing band and showing a fractional emission bandwidth of about 10%–30%. These spectral features may provide insight into the emission mechanism of repeating FRBs, or they could possibly be explained by extrinsic propagation effects in the local environment. Broadband observations can better quantify this behavior and help to distinguish between intrinsic and extrinsic effects. We present results from a simultaneous 2.25 and 8.36 GHz observation of the repeating FRB 121102 using the 70 m Deep Space Network radio telescope, DSS-43. During the 5.7 hr continuous observing session, we detected six bursts from FRB 121102, which were visible in the 2.25 GHz frequency band. However, none of these bursts were detected in the 8.36 GHz band, despite the larger bandwidth and greater sensitivity in the higher-frequency band. This effect is not explainable by Galactic scintillation and, along with previous multi-band experiments, clearly demonstrates that apparent burst activity depends strongly on the radio frequency band that is being observed.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Majid, Walid A.0000-0002-4694-4221
Pearlman, Aaron B.0000-0002-8912-0732
Nimmo, Kenzie0000-0003-0510-0740
Hessels, Jason W. T.0000-0003-2317-1446
Prince, Thomas A.0000-0002-8850-3627
Naudet, Charles J.0000-0001-6898-0533
Kocz, Jonathon0000-0003-0249-7586
Additional Information:© 2020. The American Astronomical Society. Received 2020 April 14; revised 2020 June 5; accepted 2020 June 8; published 2020 June 25. We thank Jim Cordes for useful discussions. 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 Charles Lawrence and Stephen Lichten for providing programmatic support. In addition, we are grateful to the DSN scheduling team (Hernan Diaz, George Martinez, Carleen Ward) and the Canberra Deep Space Communication Complex (CDSCC) 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
Subject Keywords:Radio transient sources
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Radio transient sources (2008)
Record Number:CaltechAUTHORS:20200626-103612250
Persistent URL:
Official Citation:Walid A. Majid et al 2020 ApJL 897 L4
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104071
Deposited By: George Porter
Deposited On:26 Jun 2020 19:30
Last Modified:16 Nov 2021 18:28

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