A Toy Model for the Time-Frequency Structure of Fast Radio Bursts: Implications for the CHIME Burst Dichotomy
arXiv:2110.10738 · doi:10.3847/1538-4357/ac3b4a
Abstract
We introduce a toy model for the time-frequency structure of fast radio bursts (FRB), in which the observed emission is produced as a narrowly-peaked intrinsic spectral energy distribution sweeps down in frequency across the instrumental bandpass as a power-law in time. Though originally motivated by emission models which invoke a relativistic shock, the model could in principle apply to a wider range of emission scenarios. We quantify the burst's detectability using the frequency bandwidth over which most of its signal-to-noise ratio (SNR) is accumulated. We demonstrate that by varying just a single parameter of the toy model-the power-law index βof the frequency drift rate-one can transform a long (and hence preferentially time-resolved) burst with a narrow time-integrated spectrum into a shorter burst with a broad power-law time-integrated spectrum. We suggest that burst-to-burst diversity in the value of βcould generate the dichotomy between burst duration and frequency-width recently found by CHIME. In shock models, the value of βis related to the radial density profile of external medium, which in light of the preferentially longer duration of bursts from repeating sources may point to diversity in the external environments surrounding repeating versus one-off FRB sources.
arXiv comment11 pages, 7 figures, to be submitted to ApJ, comments appreciated
References in corpus (58)
- A bright millisecond-duration radio burst from a Galactic magnetar
- Fast Radio Bursts
- An extreme magneto-ionic environment associated with the fast radio burst source FRB 121102
- Fast Radio Bursts: An Extragalactic Enigma
- The First CHIME/FRB Fast Radio Burst Catalog
- A model for fast extragalactic radio bursts
- A Living Theory Catalogue for Fast Radio Bursts
- Fast radio bursts as synchrotron maser emission from decelerating relativistic blast waves
- CHIME/FRB Detection of Eight New Repeating Fast Radio Burst Sources
- Periodic activity from a fast radio burst source
- Fast radio bursts: the last sign of supramassive neutron stars
- Highest-frequency detection of FRB 121102 at 4-8 GHz using the Breakthrough Listen Digital Backend at the Green Bank Telescope
- The repeating Fast Radio Burst FRB 121102: Multi-wavelength observations and additional bursts
- FRB 121102 Bursts Show Complex Time-Frequency Structure
- A flaring magnetar in FRB 121102?
- Fast radio burst source properties and curvature radiation model
- Possible periodic activity in the repeating FRB 121102
- Fast Radio Burst Morphology in the First CHIME/FRB Catalog
- Blast Waves from Magnetar Flares and Fast Radio Bursts
- Fast radio bursts: search sensitivities and completeness
- Lensing of Fast Radio Bursts by Plasma Structures in Host Galaxies
- Fast Radio Bursts from Magnetars Born in Binary Neutron Star Mergers and Accretion Induced Collapse
- High time resolution and polarisation properties of ASKAP-localised fast radio bursts
- Fast radio bursts from reconnection in magnetar magnetosphere
- Repeating Fast Radio Bursts from Magnetars with Low Magnetospheric Twist
- CHIME/FRB Detection of the Original Repeating Fast Radio Burst Source FRB 121102
- FRB microstructure revealed by the real-time detection of FRB170827
- A Binary Comb Model for Periodic Fast Radio Bursts
- The synchrotron maser emission from relativistic shocks in Fast Radio Bursts: 1D PIC simulations of cold pair plasmas
- The spectral properties of the bright FRB population
- Spectropolarimetric analysis of FRB 181112 at microsecond resolution: Implications for Fast Radio Burst emission mechanism
- Periodic Fast Radio Bursts from Luminous X-ray Binaries
- FRB-periodicity: mild pulsars in tight O/B-star binaries
- Precessing flaring magnetar as a source of repeating FRB 180916.J0158+65
- FRB Coherent Emission from Decay of Alfven Waves
- Pulsar Radio Emission Mechanism: Radio Nanoshots as a Low Frequency Afterglow of Relativistic Magnetic Reconnection
- Constraints on the Engines of Fast Radio Bursts
- A lesson from GW170817: most neutron star mergers result in tightly collimated successful GRB jets
- Extremely band-limited repetition from a fast radio burst source
- Dark Matter-induced Collapse of Neutron Stars: A Possible Link Between Fast Radio Bursts and the Missing Pulsar Problem
- Implications of a rapidly varying FRB in a globular cluster of M81
- Coherent Electromagnetic Emission from Relativistic Magnetized Shocks
- Simultaneous multi-telescope observations of FRB 121102
- Coherent emission in pulsars, magnetars and Fast Radio Bursts: reconnection-driven free electron laser
- Faraday depolarization and induced circular polarization by multi-path propagation with application to FRBs
- Radio emission from the Crab and Crab-like pulsars
- Shock-powered radio precursors of neutron star mergers from accelerating relativistic binary winds
- What does FRB light-curve variability tell us about the emission mechanism?
- Radius-to-frequency mapping and FRB frequency drifts
- Luminosity-duration relations and luminosity functions of repeating and non-repeating fast radio bursts
- The synchrotron maser emission from relativistic magnetized shocks: Dependence on the pre-shock temperature
- A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts
- Evidence of a shared spectro-temporal law between sources of repeating fast radio bursts
- Multiwavelength Radio Observations of Two Repeating Fast Radio Burst Sources: FRB 121102 and FRB 180916.J0158+65
- Implications of CHIME repeating fast radio bursts
- Self-modulation of Fast Radio Bursts
- Long and Short Fast Radio Bursts are Different from Repeating and Non-repeating Transients
- Scintillation can explain the spectral structure of the bright radio burst from SGR 1935+2154
Cited by in corpus (7)
- The Physics of Fast Radio Bursts
- The FRB 20121102A November rain in 2018 observed with the Arecibo Telescope
- Can a Single Population Account for the Discriminant Properties in Fast Radio Bursts?
- Spectropolarimetric variability in the repeating fast radio burst source FRB 20180301A
- A highly magnetized long-period radio transient exhibiting unusual emission features
- Fast radio bursts at the dawn of the 2020s
- A Practical Framework for Estimating the Repetition Likelihood of Fast Radio Bursts from Spectral Morphology