Rotation Measure study of FRB 20180916B with the uGMRT

Abstract

Context. Fast Radio Burst 20180916B is a repeating FRB whose activity window has a 16.34 day periodicity that also shifts and varies in duration with the observing frequency. Recently, arxiv:2205.09221 reported the FRB has started to show secular Rotation Measure (RM) increasing trend after only showing stochastic variability around a constant value of $-114.6$ rad m${}^{-2}$ since its discovery. Aims. We aim to further study the RM variability of FRB 20180916B. The data comes from the ongoing campaigns of FRB 20180916B using the upgraded Giant Metrewave Radio Telescope (uGMRT). The majority of the observations are in Band 4, which is centered at 650 MHz with 200 MHz bandwidth. Methods. We apply a standard single pulse search pipeline to search for bursts. In total, we detect 116 bursts with $\sim$36 hours of on-source time spanning 1200 days, with two bursts detected during simultaneous frequency coverage observations. We develop and apply a polarization calibration strategy suited for our dataset. On the calibrated bursts, we use QU-fitting to measure RM. Lastly, we also measure various other properties such as rate, linear polarization fraction and fluence distribution. Results. Of the 116 detected bursts, we could calibrate 79 of them. From which, we observed in our early observations the RM continued to follow linear trend as modeled by arxiv:2205.09221. However, our later observations suggest the source switch from the linear trend to stochastic variations around a constant value of $-58.75$ rad m${}^{-2}$. We also study cumulative rate against fluence and note that rate at higher fluences (> 1.2 Jy ms) scales as $\gamma =-1.09(7)$ whereas that at lower fluences (between 0.2 and 1.2 Jy ms) only scales as $\gamma =-0.51(1)$, meaning rate at higher fluence regime is steeper than at lower fluence regime.

abstract abridged, 11 pages, 8 figures, comments welcome

References in corpus (48)

• A bright millisecond radio burst of extragalactic origin
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• The direct localization of a fast radio burst and its host
• Fast Radio Bursts
• Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey
• A strong magnetic field around the supermassive black hole at the centre of the Galaxy
• A repeating fast radio burst source localised to a nearby spiral galaxy
• CHIME/FRB Detection of Eight New Repeating Fast Radio Burst Sources
• Periodic activity from a fast radio burst source
• An Accurate Flux Density Scale from 50 MHz to 50 GHz
• A repeating fast radio burst associated with a persistent radio source
• A bimodal burst energy distribution of a repeating fast radio burst source
• Emission Beam Geometry of Selected Pulsars Derived from Average Pulse Polarization Data
• A concordance picture of FRB 121102 as a flaring magnetar embedded in a magnetized ion-electron wind nebula
• A fast radio burst source at a complex magnetised site in a barred galaxy
• Diverse polarization angle swings from a repeating fast radio burst source
• LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B
• High time resolution and polarisation properties of ASKAP-localised fast radio bursts
• Frequency-dependent polarization of repeating fast radio bursts-implications for their origin
• Integrated Polarization Properties of 3C48, 3C138, 3C147, and 3C286
• Chromatic periodic activity down to 120 MHz in a Fast Radio Burst
• Magnetic field reversal in the turbulent environment around a repeating fast radio burst
• Rotation Measure Evolution of the Repeating Fast Radio Burst Source FRB 121102
• The 60 pc Environment of FRB 20180916B
• Dispersion and Rotation Measure of Supernova Remnants and Magnetized Stellar Winds: Application to Fast Radio Bursts
• A sudden period of high activity from repeating Fast Radio Burst 20201124A
• Polarization properties of FRB 20201124A from detections with the 100-m Effelsberg Radio Telescope
• Milliarcsecond localisation of the repeating FRB 20201124A
• The FRB 20121102A November rain in 2018 observed with the Arecibo Telescope
• Arecibo observations of a burst storm from FRB 20121102A in 2016
• The Large Dispersion and Scattering of FRB 20190520B are Dominated by the Host Galaxy
• Large magnetic field variations towards the Galactic Centre magnetar, PSR J1745-2900
• Radio Astronomical Polarimetry and the Lorentz Group
• A Large Scale Magneto-ionic Fluctuation in the Local Environment of Periodic Fast Radio Burst Source, FRB 20180916B
• The discovery and scientific potential of fast radio bursts
• Detection of ultra-fast radio bursts from FRB 20121102A
• Revealing the Dynamic Magneto-ionic Environments of Repeating Fast Radio Burst Sources through Multi-year Polarimetric Monitoring with CHIME/FRB
• uGMRT observations of a Fast and Blue Optical Transient -- AT 2018cow
• FRB 121102: drastic changes in the burst polarization contrasts with the stability of the persistent emission
• Faraday Rotation Measure Variations of Repeating Fast Radio Burst Sources
• Spectropolarimetric variability in the repeating fast radio burst source FRB 20180301A
• High frequency study of FRB 20180916B using the 100-m Effelsberg radio telescope
• Performance Analysis Techniques for Real-time Broadband RFI Filtering System of uGMRT
• A fast radio burst progenitor born in a galaxy merger
• Post-correlation beamformer for time-domain studies of pulsars and transients
• Deep Synoptic Array Science: Implications of Faraday Rotation Measures of Localized Fast Radio Bursts
• Constraining the FRB mechanism from scintillation in the host galaxy
• Modelling Annual Scintillation Velocity Variations of FRB 20201124A

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• Constraining the origin of the long term periodicity of FRB 20180916B with Polarization Position Angle