A5008702740- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Geophysics and Sensor Technology
- GNSS positioning and interference
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- High-pressure geophysics and materials
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Advanced Frequency and Time Standards
- Astronomical Observations and Instrumentation
- Antenna Design and Optimization
- Stellar, planetary, and galactic studies
- Neutrino Physics Research
- Seismic Waves and Analysis
Chinese Academy of Sciences
2019-2024
University of Chinese Academy of Sciences
2022-2024
National Astronomical Observatories
2022-2024
Institute of Modern Physics
2019
AlbaNova
2010-2013
Stockholm University
2010-2013
Fraunhofer Chalmers Research Centre for Industrial Mathematics
2010-2013
Abstract We report the properties of more than 600 bursts (including cluster-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 25–28, in a series four papers. The observations were carried out band 1.0–1.5 GHz by using center beam L -band 19-beam receiver. monitored sixteen 1 hr sessions and one 3 session spanning 23 days. All first In this paper series, we...
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 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 Spider pulsars are neutron stars that have a companion star in close orbit. The sheds material to the star, spinning it up millisecond rotation periods, while orbit shortens hours. is eventually ablated and destroyed by pulsar wind radiation 1,2 . key for studying evolutionary link between accreting X-ray isolated pulsars, irradiation effects birth of massive 3–6 Black widow extremely compact orbits (as short as 62 minutes 7 ) companions with masses much smaller than 0.1 M ⊙ They...
Introduction This paper offers a multi-scale AITP-YOLO model, based on the enhanced YOLOv10s to address challenges of difficult identification and frequent misdetection tomatoes, facilitating ripeness detection under realistic conditions. Methods A four-head detector incorporates small target layer, enhancing model's capacity identify targets. Secondly, feature fusion technique employing cross-level features is implemented in layer amalgamate convolutions varying sizes, generalization...
ABSTRACT Timing observations are crucial for determining the basic parameters of newly discovered pulsars. Using Five-hundred-meter Aperture Spherical radio Telescope (FAST) with L-band 19-beam receiver covering frequency range 1.0–1.5 GHz, FAST Galactic Plane Pulsar Snapshot (GPPS) Survey has more than 600 faint pulsars flux densities only a few or tens μJy at 1.25 GHz. To obtain accurate position, spin and dispersion measure pulsar, to calculate derived such as characteristic age surface...
ABSTRACT Double neutron star (DNS) systems offer excellent opportunities to test gravity theories. We report the timing results of PSR J1901+0658, first pulsar discovered in FAST Galactic Plane Pulsar Snapshot (GPPS) Survey. Based on observations by over 5 yr, we obtain phase-coherent solution and derive precise measurements its position, spin parameters, orbital dispersion measure. It has a period 75.7 ms, derivative 2.169(6) × 10−19 s s−1, characteristic age 5.5 Gyr. This is an orbit with...
Abstract Binary millisecond pulsars with a massive white dwarf (WD) companion are intermediate-mass binary (IMBPs). They formed via the Case BB Roche-lobe overflow (RLO) evolution channel if they in compact orbits an orbital period of less than 1 day. fairly rare known pulsar population, only five such IMBPs have been discovered before, and one them is globular cluster. Here we report six orbit, PSRs J0416+5201, J0520+3722, J1919+1341, J1943+2210, J1947+2304 J2023+2853, during Galactic Plane...
Abstract The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is the most sensitive telescope at L -band (1.0–1.5 GHz) and has been used to carry out FAST Galactic Plane Pulsar Snapshot (GPPS) survey in last 5 yr. Up now, covered one-fourth of planned areas within ±10 ∘ from plane visible by FAST, discovered 751 pulsars. After first publication discovery 201 pulsars one rotating transient (RRAT) 2021 76 RRATs 2023, here we report 473 new GPPS survey, including 137 millisecond 30...
The pulsar B0458+46 was previously believed to have a distance of about 1.3$~$kpc and be associated with nearby supernova remnant, SNR HB9 (G160.9+2.6). We observe the neutral hydrogen (HI) absorption spectrum PSR by using Five-hundred-meter Aperture Spherical radio Telescope (FAST), detect two lines at radial velocities $V_{\rm LSR} = {-7.7}~{\rm km~s}^{-1}$ $-28.1~{\rm km~s^{-1}}$. Based on Galactic rotation curve modification factor correcting for systematic stream in anticenter region,...
Double neutron star (DNS) systems offer excellent opportunities to test gravity theories. We report the timing results of PSR J1901+0658, first pulsar discovered in FAST Galactic Plane Pulsar Snapshot (GPPS) Survey. Based on observations by over 5 yr, we obtain phase-coherent solutions and derive precise measurements its position, spin parameters, orbital dispersion measure. It has a period 75.7 ms, derivative 2.169(6)$\times 10^{-19}$ s s$^{-1}$, characteristic age 5.5 Gyr. This is an orbit...
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is the most sensitive telescope at $L$-band (1.0-1.5 GHz) and has been used to carry out FAST Galactic Plane Pulsar Snapshot (GPPS) survey in last 5 yr. Up now, covered one-fourth of planned areas within $\pm10^{\circ}$ from plane visible by FAST, discovered 751 pulsars. After first publication discovery 201 pulsars one rotating transient (RRAT) 2021 76 RRATs 2023, here we report 473 new GPPS survey, including 137 millisecond...
Abstract Finding pulsars in binaries are important for measurements of the masses neutron stars, tests gravity theories, and studies star evolution. We carrying out Galactic Plane Pulsar Snapshot survey (GPPS) by using Five-hundred-meter Aperture Spherical radio Telescope (FAST). Here we present Keplerian parameters 112 newly discovered FAST GPPS survey, obtain timing solutions 27 pulsars. Companions these He white dwarfs, CO/ONe main sequence stars ultra light objects or even planets. Our...
Abstract PSR J1953+1844 (i.e., M71E) is a millisecond pulsar in 53 minute binary orbit discovered by the Five-hundred-meter Aperture Spherical radio Telescope. The mass function from timing 2.3 × 10 −7 M ⊙ . possible redback origin of this system has been discussed Pan et al. We discuss here an alternative evolution track for system, namely that descendant ultracompact X-ray (UCXB), which hydrogen-poor donor accreting onto neutron star (NS) with orbital period ≤1 hr. noticed some UCXB...
Magnetars are slowly rotating, highly magnetized young neutron stars that can show transient radio phenomena for pulses and fast bursts. We conducted observations of from two magnetars SGR$~$J1935+2154 3XMM$~$J185246.6+003317 a high-magnetic field pulsar PSR$~$J1846$-$0258 using the Five-hundred-meter Aperture Spherical Telescope (FAST). performed single pulse periodicity searches did not detect signals them. From piggyback data recorded by other FAST telescope beams when we observed...
Finding pulsars in binaries are important for measurements of the masses neutron stars, tests gravity theories, and studies star evolution. We carrying out Galactic Plane Pulsar Snapshot survey (GPPS) by using Five-hundred-meter Aperture Spherical radio Telescope (FAST). Here we present Keplerian parameters 112 newly discovered FAST GPPS survey, obtain timing solutions 27 pulsars. Companions these He white dwarfs, CO/ONe main sequence stars ultra light objects or even planets. Our...
Binary millisecond pulsars with a massive white dwarf (WD) companion are intermediate-mass binary (IMBPs). They formed via the Case BB Roche-lobe overflow (RLO) evolution channel if they in compact orbits an orbital period of less than 1 day. fairly rare known pulsar population, only five such IMBPs have been discovered before, and one them is globular cluster. Here we report six orbit, PSRs J0416+5201, J0520+3722, J1919+1341, J1943+2210, J1947+2304 J2023+2853, during Galactic Plane Pulsar...
Abstract Magnetars are slowly rotating, highly magnetized young neutron stars that can show transient radio phenomena for pulses and fast bursts. We conducted observations from two magnetars SGR J1935+2154 3XMM J185246.6+003317 a high-magnetic field pulsar PSR J1846–0258 using the Five-hundred-meter Aperture Spherical Telescope (FAST). performed single pulse periodicity searches did not detect signals them. From piggyback data recorded by other FAST telescope beams when we observed magnetar...
Abstract Radio astronomy observations are frequently impacted by radio frequency interference (RFI). We propose a novel method, named 2 σ CRF, for cleaning RFI in the folded data of pulsar observations, utilizing Bayesian-based model called conditional random fields (CRFs). This algorithm minimizes “energy” every pixel given an initial label. The standard deviations (i.e., rms values) utilized as pixels all subintegrations and channels. Non-RFI without obvious is treated “background noise,”...
Timing observations are crucial for determining the basic parameters of newly discovered pulsars. Using Five-hundred-meter Aperture Spherical radio Telescope (FAST) with L-band 19-beam receiver covering frequency range 1.0--1.5 GHz, FAST Galactic Plane Pulsar Snapshot (GPPS) Survey has more than 600 faint pulsars flux densities only a few or tens $μ$Jy at 1.25 GHz. To obtain accurate position, spin and dispersion measure pulsar, to calculate derived such as characteristic age surface...
The pulsar B0458+46 was previously believed to have a distance of about 1.3$~$kpc and be associated with nearby supernova remnant, SNR HB9 (G160.9+2.6). We observe the neutral hydrogen (HI) absorption spectrum PSR by using Five-hundred-meter Aperture Spherical radio Telescope (FAST), detect two lines at radial velocities $V_{\rm LSR} = {-7.7}~{\rm km~s}^{-1}$ $-28.1~{\rm km~s^{-1}}$. Based on Galactic rotation curve modification factor correcting for systematic stream in anticenter region,...
Pulsars radiate radio signals when they rotate. However, some old pulsars often stop radiating for periods. The underlying mechanism remains unknown, while the magnetosphere during nulling phases is hard to probe due absence of emission measurement. Here we report detection and accurate polarization measurements sporadic weak narrow dwarf pulses detected in ordinary state pulsar B2111+46 via Five-Hundred-Meter Aperture Spherical Telescope (FAST). Further analysis shows that their angles...
PSR J1953+1844 (i.e., M71E) is a millisecond pulsar (MSP)in 53 minute binary orbit discovered by the Five-hundred-meter Aperture Spherical radio Telescope. The mass function from timing $2.3\times10^{-7}$ $M_\odot$. possible redback origin of this system has been discussed Pan et al. We discuss here an alternative evolution track for system, namely that descendant ultra-compact X-ray (UCXB), which hydrogen-poor donor accreting onto neutron star (NS) with orbital period $\leq1$ hr. noticed...