A5031044791- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- High-pressure geophysics and materials
- Cosmology and Gravitation Theories
- GNSS positioning and interference
- Quantum Chromodynamics and Particle Interactions
- Geophysics and Sensor Technology
- Particle Detector Development and Performance
- Stellar, planetary, and galactic studies
- Particle accelerators and beam dynamics
- Irrigation Practices and Water Management
- Biomedical and Engineering Education
- Growth and nutrition in plants
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging and Pathology Studies
- Antenna Design and Optimization
- Parathyroid Disorders and Treatments
- Clinical Reasoning and Diagnostic Skills
Chinese Academy of Sciences
2015-2025
University of Michigan
2025
National Space Science Center
2024-2025
National Astronomical Observatories
2019-2024
University of Chinese Academy of Sciences
2019-2023
Jet Propulsion Laboratory
2021
Peking University
2012-2021
Beijing Normal University
2017
The dispersive sweep of fast radio bursts (FRBs) has been used to probe the ionized baryon content intergalactic medium, which is assumed dominate total extragalactic dispersion. While host galaxy contributions dispersion measure (DM) appear be small for most FRBs, in at least one case there evidence an extreme magneto-ionic local environment and a compact persistent source. Here we report detection localization repeating FRB 20190520B, co-located with compact, source associated dwarf high...
The polarization of fast radio bursts (FRBs), which are bright astronomical transient phenomena, contains information about their environments. Using wide-band observations with two telescopes, we report measurements five repeating FRBs and find a trend lower at frequencies. This behavior is modeled as multipath scattering, characterized by single parameter, σRM, the rotation measure (RM) scatter. Sources higher σRM have RM magnitude scattering time scales. sources highest FRB 20121102A...
The megajansky radio burst, FRB 20200428, and other bright bursts detected from the Galactic source SGR J1935+2154 suggest that magnetars can make fast (FRBs), but emission site mechanism of FRB-like are still unidentified. Here, we report emergence a pulsar phase magnetar 5 months after 20200428. Pulses were in 16.5 hours over 13 days using Five-hundred-meter Aperture Spherical Telescope, with luminosities about eight decades fainter than pulses emitted narrow window anti-aligned x-ray...
Abstract As the third paper in multiple-part series, we report statistical properties of radio bursts detected from repeating fast burst (FRB) source FRB 20201124A with Five-hundred-meter Aperture Spherical Telescope during an extremely active episode between 25th and 28th September 2021 (UT). We focus on polarization 536 bright S/N > 50. found that Faraday rotation measures (RMs) monotonically dropped −579 to −605 rad m −2 4 day window. The RM values were compatible (−300 −900 ) reported...
Abstract We report the properties of more than 800 bursts detected from repeating fast radio burst (FRB) source FRB 20201124A with Five-hundred-meter Aperture Spherical Telescope during an extremely active episode on UTC 2021 September 25th-28th in a series four papers. In this fourth paper series, we present systematic search spin period and linear acceleration object both 996 individual pulse peaks dedispersed time series. No credible was found data set. rule out presence significant...
Abstract Fast radio bursts (FRBs) are bright originating at cosmological distances. Only three repeating FRBs FRB 20121102A, 20190520B, and 20201124A among ∼60 known have circular polarization. We observed the 20220912A with Robert C. Byrd Green Bank Telescope (GBT) L -band on 2022 October 24 detected 128 in 1.4 hr, corresponding to a burst rate of about 90 hr −1 , which is highest yet for by GBT. The average rotation measure (RM) was −0.4 ± 0.3 rad m −2 negligible intraday RM change,...
Abstract We describe PSR J1926−0652, a pulsar recently discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Using sensitive single-pulse detections from FAST and long-term timing observations Parkes 64 m telescope, we probed phenomena on both long short timescales. The covered wide frequency range 270 to 800 MHz, enabling individual pulses be studied in detail. exhibits at least four profile components, short-term nulling lasting 4 450 pulses, complex subpulse...
Abstract We report the timing analysis of PSR J1846−0513, a pulsar discovered by Five-hundred-meter Aperture Spherical radio Telescope (FAST) in Commensal Radio Astronomy FAST Survey. The possesses spin period 23.36 ms and spin-down rate ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow> <mml:mi>P</mml:mi> </mml:mrow> <mml:mo>̇</mml:mo> </mml:mover> </mml:math> ) 1.0106(3) × 10 −18 s −1 , it is located an eccentric orbit e...
Text-to-SQL is a fundamental and longstanding problem in the NLP area, aiming at converting natural language queries into SQL, enabling non-expert users to operate databases. Recent advances LLM have greatly improved text-to-SQL performance. However, challenges persist, especially when dealing with complex user queries. Current approaches (e.g., COT prompting multi-agent frameworks) rely on ability of models plan generate SQL autonomously, but controlling performance remains difficult. In...
Abstract The nature of irregularly spaced pulses rotating radio transients (RRATs) complicates interstellar scintillation studies. In this Letter, we report the primary parameters a sample RRATs using pairwise correlations pulse spectra. Moreover, from measured velocities, constrain their transverse velocities. We also find reduced modulation index, m = 0.13 ± 0.01, for RRAT J1538+2345. Several possible explanations are discussed. Furthermore, single-pulse-based technique is applicable to...
We present timing solutions and analyses of 11 pulsars discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). These were using an ultra-wide bandwidth receiver in drift-scan observations made during commissioning phase FAST, then confirmed timed 64-m Parkes Radio Telescope. Each pulsar has been observed over a span at least one year. Highlighted discoveries include PSR J0344-0901, which displays mode-changing behaviour may belong to class so-called `swooshing'...
We report the follow-up of 10 pulsars discovered by Five-hundred-meter Aperture Spherical radio-Telescope (FAST) during its commissioning. The were at a frequency 500-MHz using ultra-wide-band (UWB) receiver in drift-scan mode, as part Commensal Radio Astronomy FAST Survey (CRAFTS). carried out timing campaign with 100-m Effelsberg radio-telescope L-band around 1.36 GHz. Along 11 previously reported, seems to be uncovering population older pulsars, bordering and/or even across pulsar...
ABSTRACT We report the phase-connected timing ephemeris, polarization pulse profiles, Faraday rotation measurements, and Rotating-Vector-Model (RVM) fitting results of 12 millisecond pulsars (MSPs) discovered with Five-hundred-meter Aperture Spherical radio Telescope (FAST) in Commensal Radio Astronomy FAST survey (CRAFTS). The campaigns were carried out Arecibo over 3 yr. 11 are neutron star–white dwarf binary systems, orbital periods between 2.4 100 d. 10 them have spin periods, companion...
ABSTRACT The follow-up timing observations were carried out for 24 pulsars discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) in Commensal Radio Astronomy FAST Survey. We report their phase-connected ephemeris, polarization pulse profiles, and Faraday rotation measurements. With spin periods spanning from 2.995 ms to 4.34 s, period derivatives determined spread between 7.996(8) × 10−21 9.83(3) 10−15 s s−1, which imply that they have characteristic ages 1.97 106...
Abstract Magnetars are neutron stars with extremely strong magnetic fields, frequently powering high-energy activity in X-rays. Pulsed radio emission following some X-ray outbursts has been detected, albeit its physical origin is unclear. It long speculated that the of magnetars’ signals different from those canonical pulsars, although convincing evidence still lacking. Five months after magnetar SGR 1935+2154's outburst and associated fast burst 20200428, a pulsar phase was discovered. Here...
Abstract PSR J2150+3427 is a 0.654 s pulsar discovered by the Commensal Radio Astronomy FAST Survey. From follow-up observations, we find that in highly eccentric orbit ( e = 0.601) with an orbital period of 10.592 days and projected semimajor axis 25.488 lt-s. Using 2.7 yr timing data, also measured rate periastron advance <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow> <mml:mi>ω</mml:mi> </mml:mrow> <mml:mo>̇</mml:mo>...
Abstract Using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we have recorded ∼10 5 single pulses from PSR J1022+1001. We studied polarization properties, their energy distribution, and times of arrival. This is only possible with high sensitivity available using FAST. There no indication that J1022+1001 exhibits giant pulse, nulling, or traditional mode changing phenomena. The in leading trailing components integrated profile shown to be correlated. degree both linear...
Abstract We present Arecibo 327 MHz confirmation and follow-up studies of seven new pulsars discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). These are in a pilot program Commensal Radio Astronomy FAST Survey (CRAFTS) with ultra-wide-bandwidth commissioning receiver. Five them normal two extreme nulling slow pulsars. PSR J2111+2132’s dispersion measure(DM: 78.5 pc cm −3 ) is above upper limits Galactic free electron density models, NE2001 YMW16, J2057+2133’s...
Fast radio bursts (FRBs) are bright millisecond at cosmological distances. Only three FRBs have exhibited extreme activities, such as achieving a peak event rate $\gtrsim 100$ hr$^{-1}$ or being persistently active. these among $\sim 50$ known repeating circular polarization. We observed the FRB 20220912A with Robert C. Byrd Green Bank Telescope (GBT) L-band on 24 October 2022 and detected 128 in 1.4 hours, corresponding to burst of about 90 hr$^{-1}$, which is highest yet for by GBT makes...
We report the discovery of a highly dispersed fast radio burst, FRB~181123, from an analysis $\sim$1500~hr drift-scan survey data taken using Five-hundred-meter Aperture Spherical Telescope (FAST). The pulse has three distinct emission components, which vary with frequency across our 1.0--1.5~GHz observing band. measure peak flux density to be $>0.065$~Jy and corresponding fluence $>0.2$~Jy~ms. Based on observed dispersion 1812~cm$^{-3}$~pc, we infer redshift $\sim 1.9$. From this, estimate...
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) has started the Commensal Radio Astronomy FasT Survey (CRAFTS). In this paper, we use technical parameters of FAST derived from commissioning observations to simulate completeness function for extragalactic HI survey CRAFTS, galaxies two kinds mock catalogues are selected. One is generated by Monte-Carlo simulation based on interpolated mass-velocity width ALFALFA $100\%$ (a.k.a. $\alpha$ .100) catalogue. other constructed...
Abstract We discover three new weak pulse components in two known pulsars, one PSR J0304+1932 and J1518+4904. These are emitted about halfway between the main emission beam interpulse (beam from opposite pole). They separated their peak by 99° ± 3° for 123.°6 0.°7 (leading) 93° 0.°4 (trailing) Their peak-intensity ratios to pulses ∼ 0.06% ∼0.17% ∼0.83% also analyzed flux fluctuations profile variations of emissions pulsars. The results show correlations pulses, indicating that these come...