Magnetic field reversal in the turbulent environment around a repeating fast radio burst

Anna-Thomas, Reshma; Connor, Liam; Dai, Shi; Feng, Yi; Burke-Spolaor, S.; Beniamini, Paz; Yang, Yuan-Pei; Zhang, Yongkun; Aggarwal, K. K.; Law, Casey J.; Li, Di; Niu, Chenhui; Chatterjee, Shami; Cruces, M.; Duan, Ran; Filipović, Miroslav; Hobbs, G.; Lynch, R.; Miao, Chenchen; Niu, Jiarui; Ocker, Stella Koch; Tsai, Chao-Wei; Wang, Pei; Xue, Mengyao; Yao, Jumei; Yu, Wenfei; Zhang, Bing; Zhang, L.; Zhu, Shiqiang; Zhu, Weiwei

doi:10.1126/science.abo6526

Cited by 44 publications

(34 citation statements)

References 74 publications

(54 reference statements)

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“…25 https://github.com/lofar-astron/RMextract interval over 2021 April−December when |RM| exhibits a sustained decrease of ∼50 rad m −2 . The most recent RM measurements now suggest a possible change in sign of RM excess similar to the recent observations of FRB 20190520B(Anna-Thomas et al 2023). This result may suggest a reversal in the orientation of B ∥ .…”

supporting

confidence: 81%

“…A significant fraction of repeating FRB sources appear to occupy complex magneto-ionic environments. For repeaters with PRS associations the observed RM and its variation appear to be extreme (e.g., Hilmarsson et al 2021a;Anna-Thomas et al 2023;Dai et al 2022), suggesting a strong influence of the PRS on FRB source's environment. Even for repeaters without an apparent PRS association, substantial RM evolution has been observed and appears to be a common feature of this population (e.g., Luo et al 2020;Xu et al 2022).…”

Section: Interpretation Of Rm Evolutionmentioning

confidence: 99%

“…Our current understanding of FRB polarization is mainly determined by polarimetric observations from a handful of prolific repeating sources (e.g., Michilli et al 2018;Luo et al 2020;Xu et al 2022;Anna-Thomas et al 2023;Dai et al 2022). Similar to one-off FRBs, the polarized signals of repeat bursts are characterized by a few well-known quantities: the linear and circular polarized fraction (L/I and V/I), the Faraday rotation measure (RM), and the position angle (PA).…”

Section: Introductionmentioning

confidence: 99%

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A Large-scale Magneto-ionic Fluctuation in the Local Environment of Periodic Fast Radio Burst Source FRB 20180916B

Mckinven

Gaensler

Michilli

et al. 2023

ApJ

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Fast radio burst (FRB) source FRB 20180916B exhibits a 16.33-day periodicity in its burst activity. It is as of yet unclear what proposed mechanism produces the activity, but polarization information is a key diagnostic. Here we report on the polarization properties of 44 bursts from FRB 20180916B detected between 2018 December and 2021 December by CHIME/FRB, the FRB project on the Canadian Hydrogen Intensity Mapping Experiment. In contrast to previous observations, we find significant variations in the Faraday rotation measure (RM) of FRB 20180916B. Over the 9-month period 2021 April and 2021 December we observe an apparent secular increase in RM of ∼50 rad m−2 (a fractional change of over 40%) that is accompanied by a possible drift of the emitting band to lower frequencies. This interval displays very little variation in the dispersion measure (ΔDM ≲ 0.8 pc cm−3), which indicates that the observed RM evolution is likely produced from coherent changes in the Faraday-active medium’s magnetic field. Burst-to-burst RM variations appear unrelated to the activity cycle phase. The degree of linear polarization of our burst sample (≳80%) is consistent with the negligible depolarization expected for this source in the 400–800 MHz bandpass of CHIME. FRB 20180916B joins other repeating FRBs in displaying substantial RM evolution. This is consistent with the notion that repeater progenitors may be associated with young stellar populations by their preferential occupation of dynamic magnetized environments commonly found in supernova remnants, in pulsar wind nebulae, or near high-mass stellar companions.

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supporting

confidence: 81%

Section: Interpretation Of Rm Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Large-scale Magneto-ionic Fluctuation in the Local Environment of Periodic Fast Radio Burst Source FRB 20180916B

Mckinven

Gaensler

Michilli

et al. 2023

ApJ

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“…This would require an unusual sight line given the lack of Hα emission and limited turbulence in the ISM of elliptical galaxies (Seta et al 2021;Ocker et al 2022). Alternatively, it could arise in the immediate vicinity of the source, such as in a stellar wind, analogous to the scattering in FRB 20190520 (Anna-Thomas et al 2023;Beniamini et al 2022;Niu et al 2022;Ocker et al 2023). A third option is that it could be near the host galaxy in the ICM, perhaps in the outflows or CGM of the host.…”

Section: Scattering and Scintillationmentioning

confidence: 99%

Deep Synoptic Array Science: Two Fast Radio Burst Sources in Massive Galaxy Clusters

Connor

Ravi

Catha

et al. 2023

ApJL

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The hot gas that constitutes the intracluster medium (ICM) has been studied at X-ray and millimeter/submillimeter wavelengths (Sunyaev–Zel’dovich effect) for decades. Fast radio bursts (FRBs) offer an additional method of directly measuring the ICM and gas surrounding clusters via observables such as dispersion measure (DM) and Faraday rotation measure. We report the discovery of two FRB sources detected with the Deep Synoptic Array whose host galaxies belong to massive galaxy clusters. In both cases, the FRBs exhibit excess extragalactic DM, some of which likely originate in the ICM of their respective clusters. FRB 20220914A resides in the galaxy cluster A2310 at z = 0.1125 with a projected offset from the cluster center of 520 ± 50 kpc. The host of a second source, FRB 20220509G, is an elliptical galaxy at z = 0.0894 that belongs to the galaxy cluster A2311 at the projected offset of 870 ± 50 kpc. These sources represent the first time an FRB has been localized to a galaxy cluster. We combine our FRB data with archival X-ray, Sunyaev–Zel'dovich (SZ), and optical observations of these clusters in order to infer properties of the ICM, including a measurement of gas temperature from DM and y SZ of 0.8–3.9 keV. We then compare our results to massive cluster halos from the IllustrisTNG simulation. Finally, we describe how large samples of localized FRBs from future surveys will constrain the ICM, particularly beyond the virial radius of clusters.

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“…Also, its Faraday rotation has been measured to be relatively high, RM ≈ 4500 rad m −2 (Feng et al 2022;Mckinven et al 2023). The high RM could suggest that the source lives in a dense environment, which may be contributing to a large fraction of its total DM (Michilli et al 2018;Anna-Thomas et al 2023;Dai et al 2022), making the source actually closer than the distance inferred from its DM. However, no extended source is detected in the archival PanSTARRS-DR1 data, excluding a host galaxy located in the local universe.…”

Section: Other Frb Sourcesmentioning

confidence: 99%

Subarcminute Localization of 13 Repeating Fast Radio Bursts Detected by CHIME/FRB

Michilli

Bhardwaj

Brar

et al. 2023

ApJ

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We report on improved sky localizations of 13 repeating fast radio bursts (FRBs) discovered by CHIME/FRB via the use of interferometric techniques on channelized voltages from the telescope. These so-called “baseband localizations” improve the localization uncertainty area presented in past studies by more than three orders of magnitude. The improved localization regions are provided for the full sample of FRBs to enable follow-up studies. The localization uncertainties, together with the limits on the source distances from their dispersion measures, allow us to identify likely host galaxies for two of the FRB sources. FRB 20180814A lives in a massive passive red spiral at z ∼ 0.068 with very little indication of star formation, while FRB 20190303A resides in a merging pair of spiral galaxies at z ∼ 0.064 undergoing significant star formation. These galaxies show very different characteristics, further confirming the presence of FRB progenitors in a variety of environments even among the repeating subclass.

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Magnetic field reversal in the turbulent environment around a repeating fast radio burst

Cited by 44 publications

References 74 publications

A Large-scale Magneto-ionic Fluctuation in the Local Environment of Periodic Fast Radio Burst Source FRB 20180916B

A Large-scale Magneto-ionic Fluctuation in the Local Environment of Periodic Fast Radio Burst Source FRB 20180916B

Deep Synoptic Array Science: Two Fast Radio Burst Sources in Massive Galaxy Clusters

Subarcminute Localization of 13 Repeating Fast Radio Bursts Detected by CHIME/FRB

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