A5039119858- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Relativity and Gravitational Theory
- Stellar, planetary, and galactic studies
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Astronomical Observations and Instrumentation
- Medical Imaging Techniques and Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Advanced X-ray and CT Imaging
- Plasmonic and Surface Plasmon Research
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Orbital Angular Momentum in Optics
- Adaptive optics and wavefront sensing
- Topological Materials and Phenomena
- Spectroscopy and Chemometric Analyses
- Advanced Vision and Imaging
- Computational Physics and Python Applications
Anqing Normal University
2022-2025
Nanjing University
2019-2021
University of Chinese Academy of Sciences
2017
Yunnan Observatories
2017
Chinese Academy of Sciences
2017
Recently, Rastall gravity has undergone a significant surge in popularity. We obtain power-law total mass–density profile for the inner region (within several effective radius) of early-type galaxies (ETGs) from space–time structures which are described by static spherically symmetric solutions under assumption perfect fluid matter. find that ETGs, dimensionless parameter β = κλ determines mass distribution. then use 118 galaxy–galaxy strong gravitational lensing systems to constrain β. mean...
BH M_ ⊙ ), the spin increases with increasing black hole mass, suggesting that growth is primarily driven by gas accretion, particularly in coherent accretion regime. Conversely, for holes masses ≳ 10^ decreases indicating occurs mainly through mergers, inducing chaotic accretion. (ii) At low star formation rates, consistent However, at high mergers. The value of may be used to diagnose rate host galaxies active galactic nuclei activities. (iii) Our data and analysis confirm well-known...
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 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...
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 During the early stages of galaxy evolution, a significant fraction galaxies undergo transitional phase between “blue nugget” systems, which arise from compaction large, active star-forming disks, and “red nuggets,” are red passive compact galaxies. These objects typically only observable with space telescopes, detailed studies their size, mass, stellar population parameters have been conducted on relatively small samples. Strong gravitational lensing can offer new opportunity to...
We report the discovery of two Einstein Crosses (ECs) in footprint Kilo-Degree Survey (KiDS): KIDS J232940-340922 and J122456+005048. Using integral field spectroscopy from MUSE@VLT, we confirm their gravitational-lens nature. In both cases, four spectra source clearly show a prominence absorption features, hence revealing an evolved stellar population with little star formation. The lensing model systems, assuming singular isothermal ellipsoid (SIE) external shear, shows that: 1) crosses,...
ABSTRACT We present for the first time timing and spectral analyses a narrow-line Seyfert 1 galaxy, SBS 1353 + 564, using XMM-Newton Swift multiband observations from 2007 to 2019. Our main results are as follows: (1) The temporal variability of 1353+564 is random, while hardness ratio relatively constant over span 13 yr; (2) find prominent soft X-ray excess feature below 2 keV that cannot be well described by simple blackbody component; (3) After comparing two most prevailing models...
ABSTRACT We calculate the jet power of Blandford–Znajek (BZ) model and hybrid based on self-similar solution advection-dominated accretion flows (ADAFs). study formation mechanism jets BL Lacertae (BL Lacs) with known redshifts detected by Fermi satellite after 10 yr data (4FGL-DR2). The kinetic Lacs is estimated through radio luminosity. main results are as follows. (1) find that about 72 per cent intermediate peak frequency (IBL) 94 high-frequency (HBL) can be explained ADAFs surrounding...
Abstract We use the third catalog of blazars detected by Fermi/LAT (3LAC) and γ -ray narrow-line Seyfert 1 Galaxies ( -NLSy1s) to study blazar sequence relationship between them. Our results are as follows. (i) There is a weak anticorrelation synchrotron peak frequency luminosity for both Fermi -NLSy1s, which supports sequence. However, after Doppler correction, inverse correlation disappeared, suggests that affected beaming effect. (ii) significant jet kinetic power -NLSy1s could fit well...
Abstract We carefully examine the depolarization feature of blazars in optical and near-infrared bands using sample Mead et al. Magnetohydrodynamics turbulence could be one possible reason for optical/infrared when we apply theoretical analysis Lazarian & Pogosyan. further identify that results shown most roughly obey form three-dimensional anisotropic Kolmogorov scaling. The effective Faraday rotation window length scale is not small enough to resolve polarization correlation blazar...
The physical parameters of galaxies and/or AGNs can be derived by fitting their multi-band spectral energy distributions (SEDs). By using CIGALE code, we perform SED (from ultraviolet to infrared) for 791 X-ray sources (518 and 273 normal galaxies) in the 7 Ms Chandra Deep Field-south survey (CDFS). We consider contributions from adopt more accurate redshifts than published before. Therefore, star formation rates (SFRs) stellar masses (M$_*$) are derived. classify 518 into type-I type-II...
We present here a systematic study on the mechanism of long/short timescale variability and origin soft X-ray excess for narrow-line Seyfert 1 galaxies (NLSy1s) based multi-epoch multi-band observations Swift telescope. The main results are as follows: (1) ensemble structure functions radio-quiet NLSy1s in optical, ultraviolet, bands all show unique double ‘S’ structure. structural feature reveals that long short could be generated by accretion fluctuation propagation reprocessing mechanism,...
Abstract We use a large sample of gamma-ray narrow-line Seyfert 1 galaxies ( γ -NLS1s) to study the jet formation mechanisms. find that power -NLS1s is lower than maximum Blandford–Payne (BP) mechanism. At same time, we there significant correlation between and accretion disk luminosity. Moreover, contribution rates are larger black hole mass power. These results further suggest NLS1s mainly produced by BP
ABSTRACT Under a coronal magnetic field, we estimate the maximal jet power of Blandford–Znajek (BZ) mechanism, Blandford–Payne (BP) and hybrid model. The BZ model mechanisms depends on spin black hole, while BP mechanism does not depend hole. At high hole spin, is greater than that mechanisms. We find almost all gamma-ray narrow-line Seyfert 1 galaxies (γNLS1s) can be explained by However, one source with ∼0.1–1 Eddington luminosity cannot suggest field dragged inward accretion disc...
Abstract Molecular gas is the key probe for complex interaction between accretion of black holes and star formation host galaxy active galactic nuclei (AGN). The molecular discovered around AGN indicates that this providing fuel AGN. According to theoretical model relativistic jet, spin a hole enhances jet used as an indicator activity. Therefore, we study relationship activity gas. We find significant strong correlation fraction CO luminosity early-type galaxies. However, there no late-type...
The theoretical model suggests that relativistic jets of AGN rely on the black hole spin and/or accretion. We study relationship between jet, accretion, and using supermassive samples with reliable holes. Our results are as follows: (1) There is a weak correlation radio luminosity for our sample, which may imply jet in sample depends other physical parameters besides spins, such accretion disk luminosity. (2) power can be explained by hybrid magnetic field corona. (3) significant...
The large-scale imaging survey will produce massive photometric data in multi-bands for billions of galaxies. Defining strategies to quickly and efficiently extract useful physical information from this is mandatory. Among the stellar population parameters galaxies, their masses star formation rates (SFRs) are most fundamental. We develop a novel tool, \textit{Multi-Layer Perceptron Predicting Galaxy Parameters} (MLP-GaP), that uses machine-learning (ML) algorithm accurately derive SFRs...
Abstract The large-scale imaging survey will produce massive photometric data in multi-bands for billions of galaxies. Defining strategies to quickly and efficiently extract useful physical information from this is mandatory. Among the stellar population parameters galaxies, their masses star formation rates (SFRs) are most fundamental. We develop a novel tool, \textit{Multi-Layer Perceptron Predicting Galaxy Parameters} (MLP-GaP), that uses machine-learning (ML) algorithm accurately derive...
By combining unsupervised and supervised machine learning methods, we have proposed a framework, called USmorph , to carry out automatic classifications of galaxy morphologies. In this work, update the (UML) step by proposing an algorithm based on ConvNeXt large model coding improve efficiency unlabeled morphology classifications. The method can be summarized into three key aspects as follows: (1) convolutional autoencoder is used for image denoising reconstruction rotational invariance...
Abstract Exploring the similar behavior of black hole systems with different scales will provide insight into unified physical laws systems. Here, we report a special spectral state transition process in blazar OT 081, which is driven by supermassive hole. Based on X-ray flux versus photon index distribution, stacked average spectra, L 2500 Å − α ox parameters, and broadband energy distributions, conducted pilot study for this system. The analysis results suggest that source transitions...