A5103027912- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- GNSS positioning and interference
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Astronomical Observations and Instrumentation
- Particle accelerators and beam dynamics
- Geophysics and Sensor Technology
- High-pressure geophysics and materials
- Skin Protection and Aging
- Advanced Frequency and Time Standards
- melanin and skin pigmentation
- Medical Imaging and Pathology Studies
- Soil and Unsaturated Flow
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Cancer-related molecular mechanisms research
- Laser-Plasma Interactions and Diagnostics
- High-Energy Particle Collisions Research
Chinese Academy of Sciences
2010-2025
Xinjiang Astronomical Observatory
2017-2025
University of Chinese Academy of Sciences
2017-2024
Commonwealth Scientific and Industrial Research Organisation
2020-2021
Australia Telescope National Facility
2020-2021
Kunming Institute of Zoology
2004-2020
National Astronomical Observatories
2020
Astronomy and Space
2020
Fudan University
2017
Abstract We present the third data release from Parkes Pulsar Timing Array (PPTA) project. The contains observations of 32 pulsars obtained using 64-m ‘Murriyang’ radio telescope. span is up to 18 yr with a typical cadence 3 weeks. This formed by combining an updated version our second $\sim$ more recent primarily ultra-wide-bandwidth receiver system that operates between 704 and 4032 MHz. provide calibrated pulse profiles, flux density dynamic spectra, times arrival, initial pulsar timing...
Abstract Discovery of pulsars is one the main goals for large radio telescopes. The Five-hundred-meter Aperture Spherical Telescope (FAST), that incorporates an L-band 19-beam receiver with a system temperature about 20 K, most sensitive telescope utilized discovering pulsars. We designed snapshot observation mode FAST key science project, Galactic Plane Pulsar Snapshot (GPPS) survey, in which every four nearby pointings can observe cover sky patch 0.1575 square degrees through...
A stellar common envelope occurs in a binary system when the atmosphere of an evolving star expands to encompass orbiting companion object. Such systems are predicted evolve rapidly, ejecting and leaving tighter orbit around stripped star. We used radio timing identify pulsar, PSR J1928+1815, with spin period 10.55 ms compact orbital 3.60 hours. The has 1.0 1.6 solar masses, eclipses pulsar for about 17% orbit, is undetected at other wavelengths, so it most likely helium interpret this as...
Abstract We have carried out the Galactic Plane Pulsar Snapshot (GPPS) survey by using Five-hundred-meter Aperture Spherical radio Telescope (FAST), most sensitive systematic pulsar in plane. In addition to more than 500 pulsars already discovered through normal periodical search, we report here discovery of 76 new transient sources with sporadic strong pulses, detected newly developed module for a single-pulse search. Their small DM values suggest that they all are rotating transients...
Abstract. Northern Eurasia experienced anomalous weather conditions in the 2003 summer. We examined how forest ecosystems responded to meteorological anomalies during period using dataset collected at flux monitoring sites Asia, including a boreal Mongolia, temperate forests China and Japan, sub-tropical China, as well from satellite remote sensing. From July August 2003, an active rain band stayed mid-latitude East Asia for unusually long period. Under influence of band, Gross Primary...
Abstract We conducted a pot experiment using wheat‐millet rotation to examine the effects of two successive rice‐straw biochar applications on crop growth and soil properties in acidic oxisols alkaline cambosols from C hina. Biochar was incorporated into at rates 0, 2.25 or 22.5 Mg/ha beginning each season with identical NPK fertilizer. In oxisols, largest treatment enhanced p H cation exchange capacity, decreased bulk density, improved P , K M g availability their uptake, increased wheat...
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'...
Abstract A nanohertz-frequency stochastic gravitational-wave background can potentially be detected through the precise timing of an array millisecond pulsars. This produces low-frequency noise in pulse arrival times that would have a characteristic spectrum common to all pulsars and well-defined spatial correlation. Recently North American Nanohertz Observatory for Gravitational Waves collaboration (NANOGrav) found evidence common-spectrum component their 12.5 yr data set. Here we report on...
We present the third data release from Parkes Pulsar Timing Array (PPTA) project. The contains observations of 32 pulsars obtained using 64-m "Murriyang" radio telescope. span is up to 18 years with a typical cadence 3 weeks. This formed by combining an updated version our second $\sim 3$ more recent primarily ultra-wide-bandwidth receiver system that operates between 704 and 4032 MHz. provide calibrated pulse profiles, flux-density dynamic spectra, times arrival, initial pulsar timing...
ABSTRACT As the sample size of repeating fast radio bursts (FRBs) has grown, an increasing diversity phenomenology emerged. Through long-term multi-epoch studies FRBs, it is possible to assess which phenomena are common population and unique individual sources. We present a monitoring campaign FRB source 20180301A using ultra-wideband low (UWL) receiver observations with Murriyang, Parkes 64-m telescope. The covered wide frequency band spanning approximately 0.7–4 GHz, yielded detection 46...
Abstract Rotating radio transients (RRATs) are neutron stars that emit sporadic bursts. We detected 1955 single pulses from RRAT J1913+1330 using the 19 beam receiver of Five-hundred-meter Aperture Spherical Telescope. These were in distinct clusters, with 49.4% them occurring a waiting time one rotation period. The energy distribution these individual exhibited wide range, spanning 3 orders magnitude, reminiscent repeating fast bursts (FRBs). Furthermore, we observed abrupt variations pulse...
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...
Pulsar timing arrays (PTAs) are designed to detect nanohertz-frequency gravitational waves (GWs). Since GWs anticipated from cosmic strings, PTAs offer a viable approach testing their existence. We present the results of first Bayesian search for gravitational-wave bursts string cusps (GWCSs) using third PPTA data release 30 ms pulsars. In this collection, we find no evidence GWCS signals. compare model with signal one only noise, including common spatially uncorrelated red noise (CURN), and...
Abstract We conducted targeted fast radio burst (FRB) and pulsar searches on eight pulsing ultraluminous X-ray sources (PULXs) using the Five-hundred-meter Aperture Spherical Telescope (FAST) Parkes 64 m Radio (Murriyang) to investigate whether PULXs could be progenitors of FRBs. FAST carried out 12 observations four PULXs, totaling 8 hr, while remaining 11 hr. No significant signals were detected through single-pulse periodic searches, covering a dispersion measure range 0–5000 pc cm −3 ,...
Abstract We report on a single-pulse study of PSR J1239+0326 discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST) in Commensal Radio Astronomy FAST Survey. The observations were conducted at central frequency 1.25 GHz. integrated pulse profile shows four distinct components, implying line sight traversing presumed double cone core emission beam. found correlations between intensities first and fourth components second indicating that charges emitted correlated may...
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 Understanding the jitter noise resulting from single-pulse phase and shape variations is important for detection of gravitational waves using pulsar timing arrays. We present measurements variability 12 millisecond pulsars that are part International Pulsar Timing Array sample Five-hundred-meter Aperture Spherical radio Telescope. find levels can vary dramatically among pulsars. A moderate correlation with a coefficient 0.57 between pulse width detected. To mitigate noise, we...
Abstract We report on radio observations of four magnetars SGR 0501+4516, Swift 1834.9–0846, 1E 1841–045, 1900+14, and a magnetar-like pulsar PSR J1846–0258 with the Five-hundred-meter Aperture Spherical Telescope at 1250 MHz. Notably, was observed 1 month after its 2020 X-ray outburst. The data from these were searched for periodic emissions single pulses. No emission detected any our targets. After accounting effect red noise, nondetections yield stringent upper limits flux density, S ≤...
Abstract We present 12 observations of the accreting millisecond X-ray pulsar Aql X-1, taken from 2022 August to 2023 October using Five-hundred-meter Aperture Spherical Radio Telescope at 1250 MHz. These covered both quiescence and outburst states, as determined by analyzing data Neutron Star Interior Composition Explorer Monitor All-sky Image. Periodicity single-pulse searches were conducted for each observation, but no pulsed signals detected. The obtained upper limit flux densities are...
Abstract We present polarization profiles of 23 pulsars exhibiting interpulse (IP) emissions using the Five-hundred-meter Aperture Spherical Radio Telescope. By applying rotating vector model (RVM), we measured inclination and impact angles for 16 pulsars, allowing us to investigate their beam geometries. Our analysis indicates that five IP likely originate from same magnetic pole as main pulse (MP), whereas remaining 11 MP opposite poles. For seven do not conform RVM, are unable determine...
We conducted targeted fast radio burst (FRB) and pulsar searches on eight pulsing ultraluminous X-ray sources (PULXs) using the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) Parkes 64-meter (Murriyang) to investigate whether PULXs could be progenitors of FRBs. FAST carried out 12 observations four PULXs, totaling 8 hours, while remaining 11 hours. No significant signals were detected through single-pulse periodic searches, covering a dispersion measure (DM) range 0-5000 pc...
Fast Radio Bursts (FRBs) are the short, strong radio pulses lasting several milliseconds. They subsequently identified, for most part, as emanating from unknown objects at cosmological distances. At present, over one hundred FRBs have been verified, classified into two groups: repeating bursts (20 samples) and apparently non-repeating (91 samples). Their origins, however, still hotly debated. Here,we investigate statistical classifications groups of samples to see if different origins by...
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 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...