A5035730582- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Cavitation Phenomena in Pumps
- Nuclear physics research studies
- Neutrino Physics Research
- Hydraulic and Pneumatic Systems
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Relativity and Gravitational Theory
- Nuclear Physics and Applications
- Astronomy and Astrophysical Research
- Fluid dynamics and aerodynamics studies
- Astrophysics and Star Formation Studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Black Holes and Theoretical Physics
- X-ray Diffraction in Crystallography
- Pulsars and Gravitational Waves Research
- Heat Transfer and Optimization
- Solar and Space Plasma Dynamics
- Particle Detector Development and Performance
Kunming University
2021-2025
China Institute of Atomic Energy
2018-2024
Beijing Tongren Hospital
2024
Capital Medical University
2024
Xi'an Honghui Hospital
2024
Xi'an Jiaotong University
2017-2024
Jilin University of Finance and Economics
2023
Nanjing University
2018-2021
Tokushima University
2017-2021
China Astronaut Research and Training Center
2017
Abstract In this work, we investigate the 2014–2015 neutrino flare associated with blazar TXS 0506+056 and a recently discovered muon event IceCube-200107A in spatial coincidence 4FGL J0955.1+3551, under framework of two-zone radiation model blazars where an inner/outer blob close to/far from supermassive black hole is invoked. An interesting feature that two sources have common no evidence GeV gamma-ray activity found during detection period, probably implying large opacity for gamma rays...
The ^{13}C(α,n)^{16}O reaction is the main neutron source for slow-neutron-capture process in asymptotic giant branch stars and intermediate process. Direct measurements at astrophysical energies above-ground laboratories are hindered by extremely small cross sections vast cosmic-ray-induced background. We performed first consistent direct measurement range of E_{c.m.}=0.24 to 1.9 MeV using accelerators China Jinping Underground Laboratory Sichuan University. Our covers almost entire Gamow...
Compton-thick active galactic nuclei (CT-AGNs), characterized by a significant absorption with column densities of mathrm N_H ⩾ 1.5 cm emit feeble X-ray radiation and are even undetectable instruments, making them difficult to identify. from AGNs is the predominant source cosmic background (CXB). Based on AGN synthesis models for CXB, fraction CT-AGNs should constitute substantial portion population, approximately 30% or more. The discovered in Cosmological Evolution Survey (COSMOS)...
Compton-thick active galactic nuclei (CT-AGNs), characterized by a significant absorption with column densities of $\mathrm{N_H}\geqslant 1.5\times 10^{24} \ \mathrm{cm}^{-2}$, emit feeble X-ray radiation and are even undetectable instruments, making them difficult to identify. from AGNs is the predominant source cosmic background (CXB). Based on AGN synthesis models for CXB, fraction CT-AGNs should constitute substantial portion population, approximately 30\% or more. The discovered in...
Abstract It has always been believed that feedback from active galactic nuclei (AGN) an important impact on star formation in massive galaxies. Black hole spin is physical parameter of AGN. We use a large sample star-forming galaxies to study the effects AGN formation. Our main results are as follows: (i) There significant correlations between black and rate, specific activity for early-type late-type galaxies, respectively. These indicate supermassive holes regulates (2) The slopes...
ABSTRACT Studying the periodic flux-variation behaviour of blazars is vital for probing supermassive black hole binaries and kinematics relativistic jets. In this work, we report detection multi-band possible variations blazar PKS J2134−0153, including infrared ($1.6(\pm 0.4)\times 10^3$ day) optical ($1.8(\pm 1)\times wavelengths. The periods in bands are statistically consistent with period radio band ($P_{\mathrm{Radio}} = 1760\pm 33$ days, obtained from our previous work). Moreover, flux...
Abstract Theoretical models show that the power of relativistic jets active galactic nuclei depends on spin and mass central supermassive black holes, as well accretion. Here we report an analysis archival observations a sample blazars. We find significant correlation between jet kinetic holes. At same time, use multiple linear regression to analyze relationship accretion, spin, hole mass. holes accretion are most important contributions power. The contribution rates both more than 95%....
ABSTRACT The correlation between the kinetic jet power Pjet, intrinsic γ-ray luminosity (Lint), and accretion (Ldisc) may reveal underlying physics in various black hole systems. We study relation power, luminosity, by using a large sample of jetted active galactic nuclei (AGNs), including flat-spectrum radio quasars (FSRQs), BL Lacertae objects (BL Lacs), narrow-line Seyfert 1 galaxies (γNLS1s), galaxies. Our main results are as follows: (1) slope indices Pjet Lint 0.85 ± 0.01 for whole...
We continuously monitored the blazar S5 0716+714 in optical $g$, $r$ and $i$ bands from Nov. 10, 2017 to Jun. 06, 2019. The total number of observations is 201 nights including 26973 data points. This a very large quasi-simultaneous multicolor sample for blazar. average time spans resolutions are 3.4 hours 2.9 minutes per night, respectively. During period observations, target source band brightens $14^{\rm m}.16$ $12^{\rm m}.29$ together with five prominent sub-flares, then first becomes...
We have searched quasi-periodic oscillations (QPOs) for BL Lac PKS J2134-0153 in the 15 GHz radio light curve announced by Owens Valley Radio Observatory 40-m telescope during period from 2008-01-05 to 2019-05-18, utilizing Lomb-Scargle periodogram (LSP) and weighted wavelet Z-transform (WWZ) techniques. This is first time that search periodic signal these two methods. These methods consistently reveal a QPO of 4.69 $\pm$ 0.14 years (>5 $\sigma$ confidence level). discuss possible causes...
We study the radio galaxies with known redshift detected by Fermi satellite after 10 years of data (4FGL-DR2). use a one-zone leptonic model to fit quasi-simultaneous multiwavelength these and distributions derived physical parameter as function black hole mass accretion disk luminosity. The main results are follows. (1) find that jet kinetic power most can be explained hybrid based on ADAFs surrounding Kerr holes. (2) After excluding redshift, there is significant correlation between...
Abstract We study the general physical properties of Fermi blazars using fourth source catalog data (4FGL-DR2). The quasi-simultaneous multiwavelength are fitted by one-zone leptonic model to obtain some parameters, such as jet power, magnetic field, and Doppler factor. distributions derived parameters a function black hole mass accretion disk luminosity. main results follows. (1) For standard thin disk, kinetic power most flat-spectrum radio quasars can be explained Blandford–Payne (BP)...
ABSTRACT Transient quasi-periodic oscillations (QPOs) are extremely interesting observational phenomena. However, the precise physical mechanisms leading to their generation still hotly debated. We performed a systematic search for transient QPO signals using Weighted Wavelet Z-transforms on gamma-ray light curves of 134 bright blazars with peak flux exceeding 1 × 10−6 ph cm−2 s−1 as monitored by Fermi-LAT. Artificial were generated from power spectral density and probability distribution...
We investigate the physical properties of Fermi TeV BL Lac objects' jets by modelling quasi-simultaneous spectral energy distribution 29 Lacs in frame a one-zone leptonic synchrotron self-Compton model. Our main results are following. (i) There is negative correlation between B and δ our sample, which suggests that dependent on each other mainly Thomson regime. (ii) correlations νsy r, νIC signature energy-dependent statistical acceleration or stochastic acceleration. significant r s,...
Abstract We collect a large sample with reliable redshift detected by the Fermi satellite after 10 yr of data (4FGL-DR2), including blazars, gamma-ray narrow-line Seyfert 1 galaxies ( γ NLS1s), and radio galaxies. The spectral energy distributions these sources are fitted using second-degree polynomial, some important parameters curvature, synchrotron peak frequency, luminosity obtained. Based on those parameters, we discuss blazar sequence particle acceleration mechanism. Our main results...
Abstract The origin of the multiband activities (outbursts/flares) blazars is still a heavily debated topic. Shock and magnetic reconnection have long been considered as possible triggers activities. In this paper, we present an exploration for high-redshift ( z = 1.8385) flat-spectrum radio quasar PKS 1502+106. Utilizing data from to γ -ray optical polarization observations, investigate two dramatic in detail: -ray-dominated outburst 2015 optical-dominated 2017. Our main results are...
Abstract We present here the first systematic search of short-timescale γ -ray flares from 29 high Galactic latitude BL Lac objects over 14 yr Fermi Large Area Telescope data. Using a combined Bayesian Blocks and HOP algorithm, we identified seven high-quality orbital timescale flare segments three sources quantified 24 structures. then performed comprehensive analysis symmetry, power spectral density (PSD) variability, flux–photon index relation. The main results are as follows. (1)...
Abstract In deep X-ray surveys, active galactic nuclei (AGNs) with a broad range of luminosities have been identified. However, cosmologically distant low-luminosity AGN (LLAGN, <?CDATA ${L}_{{\rm{X}}}\lesssim {10}^{42}$?> erg s −1 ) identification still poses challenge because significant contamination from host galaxies. Based on the 7 Ms Chandra Deep Field-South (CDF-S) survey, longest-timescale (∼17 years) survey to date, we utilize an variability selection technique search for LLAGNs...