FRB$-$SRB$-$XRB: Geometric and Relativistic Beaming Constraints of Fast Radio Bursts from the Galactic Magnetar SGR J1935+2154

Abstract

The detection of a fast radio burst (FRB), FRB 200428, coincident with an X-ray burst (XRB) from the Galactic magnetar soft gamma repeater (SGR) SGR J1935+2154 suggests that magnetars can produce FRBs. Many XRBs have been detected from the source, but very few were found to be associated with bursty radio emission. Meanwhile, a number of weaker radio bursts have been detected from the source, which could in principle be slow radio bursts (SRBs): FRBs detected at viewing angles outside the FRB jet cone. In this paper, we use these X-ray and radio observations to constrain the geometric and relativistic beaming factors of FRBs under two hypotheses. First, we assume that all SRBs should be associated with XRBs like FRB 200428. We use the FRB-SRB closure relations to identify two SRBs and derive that FRB beaming must be geometrically narrow, ${\theta }_j\lesssim 10^{-2}$ rad, and follow ${\theta }_j\Gamma \sim 2$. Second, we assume a less stringent constraint for SRBs by not requiring that they are associated with XRBs. We identify a total of seven SRBs, five of which have Gaussian-like spectra, and derive that FRB beaming factors again follow ${\theta }_j\Gamma \sim 2$.

arXiv comment13 pages, 6 figures, accepted for publication in MNRAS

References in corpus (42)

• The Fermi Gamma-Ray Burst Monitor
• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• A fast radio burst associated with a Galactic magnetar
• A bright millisecond-duration radio burst from a Galactic magnetar
• Fast radio bursts as synchrotron maser emission from decelerating relativistic blast waves
• The CHIME Fast Radio Burst Project: System Overview
• INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
• The Physical Mechanisms of Fast Radio Bursts
• Fast radio burst source properties and curvature radiation model
• HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428
• A Burst in a Wind Bubble and the Impact on Baryonic Ejecta: High-Energy Gamma-Ray Flashes and Afterglows from Fast Radio Bursts and Pulsar-Driven Supernova Remnants
• A peculiar hard X-ray counterpart of a Galactic fast radio burst
• Bunching Coherent Curvature Radiation in Three-Dimensional Magnetic Field Geometry: Application to Pulsars and Fast Radio Bursts
• On the radiation mechanism of repeating fast radio bursts
• Repeating Fast Radio Bursts from Magnetars with Low Magnetospheric Twist
• No pulsed radio emission during a bursting phase of a Galactic magnetar
• Detection of two bright radio bursts from magnetar SGR 1935+2154
• Simultaneous X-ray, gamma-ray, and Radio Observations of the repeating Fast Radio Burst FRB 121102
• FRB Coherent Emission from Decay of Alfven Waves
• FAST observations of an extremely active episode of FRB 20201124A: I. Burst morphology
• The NICER View of the 2020 Burst Storm and Persistent Emission of SGR 1935+2154
• Fast radio bursts and their high-energy counterpart from magnetar magnetospheres
• Coherent inverse Compton scattering by bunches in fast radio bursts
• Magnetospheric curvature radiation by bunches as emission mechanism for repeating fast radio bursts
• The Fast Radio Burst Luminosity Function and Death Line in the Low-Twist Magnetar Model
• Fermi/GBM View of the 2019 and 2020 Burst Active Episodes of SGR J1935+2154
• Detection of new pulsars at the frequency 111 MHz
• Pair separation in parallel electric field in magnetar magnetosphere and narrow spectra of fast radio bursts
• Induced scattering of short radio pulses
• Calibrating CHIME, A New Radio Interferometer to Probe Dark Energy
• STARE2: Detecting Fast Radio Bursts in the Milky Way
• Quasi-periodic oscillations of the X-ray burst from the magnetar SGR J1935+2154 and associated with the fast radio burst FRB 200428
• Comprehensive analysis of a dense sample of FRB 121102 bursts
• The Insight-HXMT mission and its recent progresses
• On the magnetospheric origin of Repeating Fast Radio Bursts
• Insight-HXMT dedicated 33-day observation of SGR J1935+2154 I. Burst Catalog
• Insight-HXMT dedicated 33-day observation of SGR J1935+2154 II. Burst Spectral Catalog
• Periodicity Search on X-ray Bursts of SGR J1935+2154 Using 8.5 yr of Fermi/GBM Data
• The Northern Cross Fast Radio Burst project. I. Overview and pilot observations at 408 MHz
• "Slow" Radio Bursts from Galactic Magnetars?
• Bursts before Burst: A Comparative Study on FRB 200428-associated and FRB-absent X-ray Bursts from SGR J1935+2154
• The plasma suppression effect can be ignored in realistic FRB models invoking bunched coherent radio emission

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• The Physics of Fast Radio Bursts
• Multi-wavelength and Multi-messenger Counterparts of Fast Radio Bursts
• Hyper-active repeating fast radio bursts from rotation modulated starquakes on magnetars
• Fast Radio Bursts with Narrow Beaming Angles Can Escape from Magnetar Magnetospheres
• Plasma lens with frequency-dependent dispersion measure effects on fast radio bursts
• Geometrical envelopes of fast radio bursts