A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts
| Autor: | Charles J. Naudet, Jason W. T. Hessels, Aaron B. Pearlman, K. Nimmo, Thomas A. Prince, Shinji Horiuchi, Walid A. Majid, Jonathon Kocz |
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| Přispěvatelé: | High Energy Astrophys. & Astropart. Phys (API, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Scintillation 010504 meteorology & atmospheric sciences Frequency band Bandwidth (signal processing) FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Spectral line Radio telescope Space and Planetary Science 0103 physical sciences Broadband Radio frequency Multi-band device Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Astrophysical Journal Letters, 897(1):L4. IOP Publishing Ltd. |
| ISSN: | 2041-8205 |
| Popis: | 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 fast radio bursts, 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 (DSN) radio telescope, DSS-43. During the 5.7 hr continuous observing session, we detected 6 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. Comment: 8 pages, 3 figures, 1 table. Accepted for publication in ApJL on 2020 June 8. v2: Updated to match published version |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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