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

Majid, Walid A.; Pearlman, Aaron B.; Nimmo, K.; Hessels, J. W. T.; Prince, Thomas A.; Naudet, C. J.; Kocz, J.; Horiuchi, S.

doi:10.3847/2041-8213/ab9a4a

Cited by 34 publications

(41 citation statements)

References 39 publications

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“…Our measurements agree well with estimates from the literature obtained close to our observing epochs, e.g. those from the Parkes telescope on MJD 58939 (2020 March 31) between about 0.7 to 4 GHz (Lower et al 2020a) and the one from the Deep Space Network on MJD 58947 (2020 April 08) between 2.3 and 8.4 GHz (Majid et al 2020a), which further reassured us of the fidelity of our calibration methods. The magnetar's radio spectrum was therefore surprisingly steep at the times of measurement and showed a signifi- The same multiple-epoch data as above, but plotted against frequency.…”

Section: Flux Density Timeline and Spectrumsupporting

confidence: 89%

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High-cadence observations and variable spin behaviour of magnetar Swift J1818.0−1607 after its outburst

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Cognard

Cruces

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We report on multi-frequency radio observations of the new magnetar Swift J1818.0−1607, following it for more than one month with high cadence. The observations commenced less than 35 hours after its registered first outburst. We obtained timing, polarisation and spectral information. Swift J1818.0−1607 has an unusually steep spectrum for a radio emitting magnetar and also has a relatively narrow and simple pulse profile. The position angle swing of the polarisation is flat over the pulse profile, possibly suggesting that our line-of-sight grazes the edge of the emission beam. This may also explain the steep spectrum. The spin evolution shows large variation in the spin-down rate, associated with four distinct timing events over the course of our observations. Those events may be related to the appearance and disappearance of a second pulse component. The first timing event coincides with our actual observations, while we did not detect significant changes in the emission properties which could reveal further magnetospheric changes. Characteristic ages inferred from the timing measurements over the course of months vary by nearly an order of magnitude. A longer-term spin-down measurement over approximately 100 days suggests an characteristic age of about 500 years, larger than previously reported. Though Swift J1818.0−1607 could still be one of the youngest neutron stars (and magnetars) detected so far, we caution using the characteristic age as a true-age indicator given the caveats behind its calculation.

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Section: Flux Density Timeline and Spectrumsupporting

confidence: 89%

“…On the contrary, on the next day, MJD 58936 (2020 March 28), a single-component integrated profile was detected with high significance. We Majid et al 2020a are marked with stars. The middle panel shows a piece-wise derivative of the model frequency evolution, averaged over 1-day windows.…”

Section: 5(3) Mmentioning

confidence: 99%

High-cadence observations and variable spin behaviour of magnetar Swift J1818.0−1607 after its outburst

Champion

Cognard

Cruces

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…As a result, the broadband spectral behavior of most FRBs remains largely unexplored at high frequencies since precise sky positions are generally needed for follow-up high-frequency radio observations. The precise localization of FRB121102 to a host galaxy (Chatterjee et al 2017;Marcote et al 2017;Tendulkar et al 2017) subsequently enabled the detection of numerous radio bursts up to ∼8 GHz(e.g., see Law et al 2017;Scholz et al 2017a;Gajjar et al 2018;Michilli et al 2018;Spitler et al 2018;Zhang et al 2018;Gourdji et al 2019;Houben et al 2019;Pearlman et al 2019b;Majid et al 2020). These observations revealed that FRB121102 emits narrowband bursts, with fractional emission bandwidths of ∼10-30%, across a wide range of radio frequencies.…”

Section: Introductionmentioning

confidence: 99%

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

Pearlman

Majid

Prince

et al. 2020

ApJL

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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+65ʼs 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.

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“…7 ), searching for bursts at a wide range of radio frequencies to study their spectral properties (e.g. 8,9 ), and using long-baseline interferometers to precisely localise the bursts and thereafter perform multi-wavelength follow-up to identify and study the host galaxy and local environment [10][11][12][13][14] . The repetitive nature also provides the opportunity to target these sources and record voltage data for multiple bursts -in order to probe very high time and frequency resolution, and study the polarimetric properties over a wide range of observing epochs and radio frequencies.…”

Section: Introductionmentioning

confidence: 99%

Microsecond polarimetry of the repeating FRB 20180916B

Nimmo¹,

Hessels²,

Keimpema³

et al. 2020

Preprint

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Fast radio bursts (FRBs) exhibit a wide variety of spectral, temporal and polarimetric properties, which can unveil clues into their emission physics and propagation effects in the local medium. FRBs are challenging to study at very high time resolution due to the precision needed to constrain the dispersion measure, signal-to-noise limitations, and also scattering from the intervening medium. Here we present the high-time-resolution (down to 1 μs) polarimetric properties of four 1.7-GHz bursts from the repeating FRB 20180916B, which were detected in voltage data during observations with the European VLBI Network. In these bursts we observe a range of emission timescales spanning three orders of magnitude, the shortest component width reaching 3-4 μs (below which we are limited by scattering). We demonstrate that all four bursts are highly linearly polarised (≥ 80%), show no evidence for significant circular polarisation (≤ 15%), and exhibit a constant polarisation position angle during and between bursts. On short timescales (≤ 100 μs), however, there appear to be subtle (few degree) polarisation position angle variations across the burst profiles. These observational results are most naturally explained in an FRB model where the emission is magnetospheric in origin, as opposed to models where the emission originates at larger distances in a relativistic shock.

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

Cited by 34 publications

References 39 publications

High-cadence observations and variable spin behaviour of magnetar Swift J1818.0−1607 after its outburst

High-cadence observations and variable spin behaviour of magnetar Swift J1818.0−1607 after its outburst

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

Microsecond polarimetry of the repeating FRB 20180916B

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