A5068544321- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Astronomy and Astrophysical Research
- Black Holes and Theoretical Physics
- Radio Astronomy Observations and Technology
- Statistical and numerical algorithms
- Galaxies: Formation, Evolution, Phenomena
- Solid-state spectroscopy and crystallography
Nanning Normal University
2024
Guangxi University
2015-2024
University of Science and Technology of China
2018-2021
Purple Mountain Observatory
2018-2019
The University of Sydney
2017
The external forward shock (EFS) models have been the standard paradigm to interpret broad-band afterglow data of gamma-ray bursts (GRBs). One prediction is that some temporal breaks at different energy bands should be achromatic. Observations in Swift era revealed chromatic behaviors least GRBs, casting doubts on EFS origin GRB afterglows. In this paper, we perform a systematic study address question: how bad/good are models? Our sample includes 85 GRBs well-monitored X-ray and optical...
Owing to the detection of an extremely bright fast radio burst (FRB) 200428 associated with a hard X-ray counterpart from magnetar soft gamma-ray repeater (SGR) 1935+2154, distance SGR 1935+2154 potentially hosted in supernova remnant (SNR) G57.2+0.8 can be revisited. Under assumption that and SNR are physically related, this Letter, by investigating dispersion measure (DM) FRB contributed foreground medium our Galaxy local environments combining other observational constraints, we find...
The radiation physics of repeating fast radio bursts (FRBs) remains enigmatic. Motivated by the observed narrow-banded emission spectrum and ambiguous fringe pattern spectral peak frequency (ν_ pk) distribution some FRBs, such as FRB 20121102A, we propose that from FRBs arise synchrotron maser in localized blobs within weakly magnetized plasma relativistically moves toward observers. Assuming observers with a bulk Lorentz factor Γ=100 electron an individual blob is monoenergetic e ∼300), our...
The radiation physics of repeating fast radio bursts (FRBs) remains enigmatic. Motivated by the observed narrow-banded emission spectrum and ambiguous fringe pattern spectral peak frequency ($\nu_{\rm pk}$) distribution some FRBs, such as FRB 20121102A, we propose that from FRBs arise synchrotron maser in localized blobs within weakly magnetized plasma relativistically moves toward observers. Assuming observers with a bulk Lorentz factor $\Gamma=100$ electron an individual blob is...
To probe this question, we perform a statistical analysis using the first Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) catalog and identify few discriminant properties between repeating non-repeating FRBs such as repetition rate, duration, bandwidth, spectral index, peak luminosity, potential frequency. If belong to one population, their distribution distinctions for rate duration can be explained by selection effect due beamed emission in Connor et al. (2020)....
Abstract Recently, the pulsar timing array (PTA) collaborations, including CPTA, EPTA, NANOGrav, and PPTA, announced that they detected a stochastic gravitational wave background spectrum in nHz band. This may be relevant to cosmological phase transition suggested by some models. Magnetic monopoles primordial black holes (PBHs), two unsolved mysteries universe, also have their production related transition. Inspired that, we revisit model proposed Stojkovic Freese, which involves PBHs...
Abstract We present the scintillation velocity measurements of FRB 20201124A from Five-hundred-meter Aperture Spherical radio Telescope observations, which reveal an annual variation. This variation is further supported by changes detected in arc as observed secondary spectrum. attribute to presence a moderately anisotropic scattering screen located at distance 0.4 ± 0.1 kpc Earth. Our results prove that this fast burst (FRB) mainly caused material close Earth on Galactic scale. However,...
In this paper we propose the model that coalescence of primordial black holes (PBHs) binaries with equal mass $M \sim 10^{28}$g can emit luminous gigahertz (GHz) radio transient, which may be candidate sources for observed fast bursts (FRBs), if at least one hole holds appropriate amount net electric charge $Q$. Using a dimensionless quantity $q = Q/\sqrt{G}M$, our analyses infer $q\sim O(10^{-4.5})$ explain FRBs released energy order $O(10^{40}) {\rm ergs}$. With current sample and assuming...
In this work, we propose an accreting stellar binary model for understanding the active periodic fast radio bursts (FRBs). The system consists of a compact object (CO) and donor star (DS) companion in eccentric orbit, where DS fills its own Roche lobe near periastron. CO accretes material from then drive relativistic magnetic blobs. interaction between blobs wind produces pair shocks. We find that both reverse shock forward are likely to produce FRBs via synchrotron maser mechanism. show can...
ABSTRACT The cosmic evolution of gamma-ray burst (GRB) luminosity is essential for revealing the GRB physics and using GRBs as cosmological probes. We investigate long with a large sample 258 Swift /BAT GRBs. By describing peak individual <?CDATA ${L}_{{\rm{p}}}\propto \text{}{(1+z)}^{k}$?> <?MML <mml:math> <mml:msub> <mml:mrow> <mml:mi>L</mml:mi> </mml:mrow> <mml:mi mathvariant="normal">p</mml:mi> </mml:msub> <mml:mo>∝</mml:mo> <mml:mtext/> <mml:msup> <mml:mo stretchy="true">(</mml:mo>...
Abstract The physical origin of fast radio bursts (FRBs) is still unclear. However, young magnetars associated with short-duration gamma-ray (SGRBs) have been thought to be possible central engines for some FRBs. In this paper, we perform a systematic search SGRBs that are FRBs in sample including 623 (601 one-off and 22 repeaters) 168 precise localizations. We find FRB 190309A spatially GRB 060502B, chance probability 0.05 when temporal redshift information taken into account. Considering...
H i absorption studies yield information on both active galactic nucleus (AGN) feeding and feedback processes. This AGN activity interacts with the neutral gas in compact radio sources, which are believed to represent young or recently re-triggered population. We present results of a survey for sample 66 sources at 0.040 < z 0.096 Australia Telescope Compact Array. In total, we obtained seven detections, five new, large range peak optical depths (3–87 per cent). Of 71 cent exhibit...
Assuming that the shallow-decaying phase in early X-ray lightcurves of gamma-ray bursts (GRBs) is attributed to dipole radiations (DRs) a newborn magnetar, we present comparative analysis for magnetars born death massive stars and merger compact binaries with long short GRB (lGRB sGRB) data observed {\em Swift} mission. We show typical braking index ($n$) $\sim 3$ sGRB sample, it 4$ lGRB sample. Selecting sub-sample whose spin-down dominated by DRs ($n\lesssim 3$) adopting universal...
We report our very early optical observations of GRB 110530A and investigate its jet properties together with X-ray afterglow data. A peculiar broad onset bump followed by a plateau is observed in R band lightcurve. The data the other bands are well consistent temporal feature Our joint spectral fits show that they same regime, photon index $\sim 1.70$. lightcurves fitted standard external shock model considering delayed energy injection component. Based on modeling results, we find...
For a binary composed of spinning black hole (BH; with mass ≳7M⊙) and strongly magnetized neutron star (NS; surface magnetic field strength BS,NS ≳ 1012 G ∼1.4 M⊙), the NS as whole will possibly eventually plunge into BH. During inspiral phase, BH could be charged to Wald charge quantity QW until merger in an electro-vacuum approximation. merger, if creates its own magnetosphere due electric strong enough for pair cascades spark, would transit from force-free cases discharge time ≳1 ms. As...
ABSTRACT Recently, many gravitational wave events from compact binary mergers have been detected by LIGO. Determining the final mass and spin of remnant black holes (RBHs) is a fundamental issue also important in astrophysics. In this paper, unified models for predicting RBHs proposed. The achieve good accuracy within parameter range interest. addition, rotational energy studied that relevant to electromagnetic counterparts mergers. It found distribution different types has its own...
Abstract The observed spectral shapes variation and tentative bimodal burst energy distribution (E-distribution) of fast radio (FRB) 20121102A with the FAST telescope are great puzzles. Adopting published multifrequency data Arecibo telescopes at L band Green Bank Telescope (GBT) C band, we investigate these puzzles through Monte Carlo simulations. intrinsic function (E-function) is modeled as <?CDATA ${dp}/{dE}\propto {E}^{-{\alpha }_{{\rm{E}}}}$?> <mml:math...
Recently, the pulsar timing array (PTA) collaborations, including CPTA, EPTA, NANOGrav, and PPTA, announced that they detected a stochastic gravitational wave background spectrum in nHz band. This may be relevant to cosmological phase transition suggested by some models. Magnetic monopoles primordial black holes (PBHs), two unsolved mysteries universe, also have their production related transition. Inspired that, we revisit model proposed Stojkovic Freese, which involves PBHs accretion solve...
Abstract In this paper, we upgrade the constraints for Earth-mass primordial black hole mergers model based on first Canadian Hydrogen Intensity Mapping Experiment (CHIME)/fast radio burst (FRB) catalog. Assuming null hypothesis that observed non-repeating FRBs originate from mergers, find how charges were distributed in population is well described by a double power-law function with typical charge value of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">...
Fast radio bursts (FRBs) are mysterious astronomical transients with extremely short intrinsic duration. Until now, the physical origins of them still remain elusive especially for non-repeating FRBs. Strongly inspired by recent progress on possible evidence Earth-mass primordial black holes, we revisit model holes mergers as sources Under null hypothesis that observed FRBs originated from analyzed four independent samples to study parameters i.e. typical charge value $q_{\rm{c}}$ and power...