Rotation Measure Evolution of the Repeating Fast Radio Burst Source FRB 121102
| Autor: | K. Nimmo, Stefan Hackstein, Robert Wharton, Jason W. T. Hessels, Paul Demorest, K. Gourdji, Gregory Desvignes, Michael Kramer, G. H. Hilmarsson, Laura Spitler, D. Michilli, R. Mckinven, Andrew Seymour |
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| Přispěvatelé: | High Energy Astrophys. & Astropart. Phys (API, FNWI), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics 010504 meteorology & atmospheric sciences Fast radio burst Galactic Center FOS: Physical sciences Astronomy and Astrophysics Astrophysics Magnetar 01 natural sciences Galaxy Radio telescope Neutron star Space and Planetary Science 0103 physical sciences [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Supernova remnant Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics 0105 earth and related environmental sciences Radio astronomy |
| Zdroj: | Astrophysical Journal, 908(1):L10. IOP Publishing Ltd. The Astrophysical journal letters The Astrophysical journal letters, Bristol : IOP Publishing, 2021, 908 (1), pp.L10. ⟨10.3847/2041-8213/abdec0⟩ |
| ISSN: | 0004-637X 2041-8205 2041-8213 |
| DOI: | 10.3847/2041-8213/abdec0⟩ |
| Popis: | The repeating fast radio burst source FRB 121102 has been shown to have an exceptionally high and variable Faraday rotation measure (RM), which must be imparted within its host galaxy and likely by or within its local environment. In the redshifted ($z=0.193$) source reference frame, the RM decreased from $1.46\times10^5$~rad~m$^{-2}$ to $1.33\times10^5$~rad~m$^{-2}$ between January and August 2017, showing day-timescale variations of $\sim200$~rad~m$^{-2}$. Here we present sixteen FRB 121102 RMs from burst detections with the Arecibo 305-m radio telescope, the Effelsberg 100-m, and the Karl G. Jansky Very Large Array, providing a record of FRB 121102's RM over a 2.5-year timespan. Our observations show a decreasing trend in RM, although the trend is not linear, dropping by an average of 15\% year$^{-1}$ and is $\sim9.7\times10^4$~rad~m$^{-2}$ at the most recent epoch of August 2019. Erratic, short-term RM variations of $\sim10^3$~rad~m$^{-2}$ week$^{-1}$ were also observed between MJDs 58215--58247. A decades-old neutron star embedded within a still-compact supernova remnant or a neutron star near a massive black hole and its accretion torus have been proposed to explain the high RMs. We compare the observed RMs to theoretical models describing the RM evolution for FRBs originating within a supernova remnant. FRB 121102's age is unknown, and we find that the models agree for source ages of $\sim6-17$~years at the time of the first available RM measurements in 2017. We also draw comparisons to the decreasing RM of the Galactic center magnetar, PSR J1745--2900. Accepted version. 17 pages, 8 figures |
| Databáze: | OpenAIRE |
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