A5100626933- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Oceanographic and Atmospheric Processes
- Mechanical and Optical Resonators
- Force Microscopy Techniques and Applications
- Climate variability and models
- Radio Astronomy Observations and Technology
- Marine and coastal ecosystems
- Advanced MEMS and NEMS Technologies
- GaN-based semiconductor devices and materials
- Geology and Paleoclimatology Research
- Semiconductor Quantum Structures and Devices
- Astro and Planetary Science
- Cancer therapeutics and mechanisms
- Graph Theory and Algorithms
- Statistical Methods and Inference
- Cloud Computing and Resource Management
- Scientific Measurement and Uncertainty Evaluation
Xiamen University
2013-2025
Sichuan Normal University
2023
Chinese Academy of Sciences
2008-2023
Qingdao National Laboratory for Marine Science and Technology
2020-2023
Institute of Oceanology
2018-2023
University of Chinese Academy of Sciences
2019-2023
South China Normal University
2022-2023
Shanghai Institute for Science of Science
2022-2023
First Affiliated Hospital of Xiamen University
2023
Nanyang Technological University
2022
Abstract As one paper in a series reporting on large reverberation mapping campaign of super-Eddington accreting massive black holes (SEAMBHs) active galactic nuclei (AGNs), we present the results 10 SEAMBHs monitored spectroscopically during 2015–2017. Six them are observed for first time, and have generally higher 5100 Å luminosities than our from 2012 to 2015; remaining four repeat observations check if their previous lags change. Similar SEAMBHs, H β time newly objects shorter values...
Abstract Changing-look active galactic nuclei (CL-AGNs), characterized by the emergence or disappearance of broad lines accompanied extreme continuum flux variability, have drawn much attention for their potential to reveal physical processes underlying AGN evolution. We perform seven-season spectroscopic monitoring on Mrk1018, one earliest identified CL-AGN. Around 2020, we detect a full-cycle changing-look transition Mrk 1018 within year, associated with nucleus outburst, which likely...
This paper reports results of the third-year campaign monitoring super-Eddington accreting massive black holes (SEAMBHs) in active galactic nuclei (AGNs) between 2014-2015. Ten new targets were selected from quasar sample Sloan Digital Sky Survey (SDSS), which are generally more luminous than SEAMBH candidates last two years. H$\beta$ lags ($\tau_{_{\rm H\beta}}$) five 10 quasars have been successfully measured this season. We find that shorter, by large factors, those objects with same...
ABSTRACT As a natural consequence of cosmological hierarchical structure formation, sub-parsec supermassive black hole binaries (SMBHBs) should be common in galaxies but thus far have eluded spectroscopic identification. Based on four decades optical monitoring, we report that the nucleus NGC 5548, nearby Seyfert galaxy long suspected to experienced major merger about 1 billion yr ago, exhibits long-term variability with period ∼14 continuum and broad H β emission line. Remarkably,...
ABSTRACT NGC 5548 is the best-observed reverberation-mapped active galactic nucleus with long-term, intensive monitoring. Here we report results from a new observational campaign between 2015 January and July. We measure centroid time lag of broad H β emission line respect to 5100 Å continuum obtain <?CDATA ${\tau }_{{\rm{cent}}}={7.20}_{-0.35}^{+1.33}$?> days in rest frame. This yields black hole mass ${M}_{\bullet }={8.71}_{-2.61}^{+3.21}\times {10}^{7}{M}_{\odot }$?> using dispersion 3124...
Abstract The Gaia Data Release 3 (DR3) mission has identified and provided about 440,000 binary systems with orbital solutions, offering a valuable resource for searching binaries including compact component. By combining the DR3 data radial velocities from LAMOST spectroscopic survey, we identify three wide possibly containing object. For two of these sources main-sequence companion, no obvious excess is observed in blue/red band XP spectra, medium-resolution spectra exhibit clear...
Abstract The growing “Hubble tension” has prompted the need for precise measurements of cosmological distances. This paper demonstrates a purely geometric approach determining distances to extragalactic binaries through joint analysis spectroastrometry (SA), radial velocity (RV), and light-curve (LC) observations. A parameterized model binary system is outlined, simulated SA, RV, LC data are computed infer probability distribution parameters based on mock data. impacts quality distance...
Abstract We study the long-term variability in optical monitoring database of Ark 120, a nearby radio-quiet active galactic nucleus (AGN) at distance 143 Mpc ( z = 0.03271). compiled historical archival photometric and spectroscopic data since 1974 conducted new two-year campaign 2015–2017, resulting total temporal baseline over four decades. The variations continuum exhibit wave-like pattern H β integrated flux series varies with similar behavior. broad profiles have asymmetric double...
Despite many decades of study, the kinematics broad-line region 3C~273 are still poorly understood. We report a new, high signal-to-noise, reverberation mapping campaign carried out from November 2008 to March 2018 that allows determination time lags between emission lines and variable continuum with precision. The lag variations in H$β$ relative those 5100 Angstrom is $146.8_{-12.1}^{+8.3}$ days rest frame, which agrees very well Paschen-$α$ measured by GRAVITY at Very Large Telescope...
Abstract We present the results from a spectroscopic monitoring campaign to obtain reverberation mapping measurements and investigate broad-line region (BLR) kinematics for active galactic nuclei (AGNs) of Mrk 817 NGC 7469. This was undertaken with Lijiang 2.4 m telescope. The median sampling is 2.0 days 1.0 day detect time lags broad emission lines, including H β , γ He ii, i both AGNs, Fe ii respect varying AGN continuum at 5100 Å. Investigating relationship between line widths we find...
We report the results of a multi-year spectroscopic and photometric monitoring campaign two luminous quasars, PG~0923+201 PG~1001+291, both located at high-luminosity end broad-line region (BLR) size-luminosity relation with optical luminosities above $10^{45}~{\rm erg~s^{-1}}$. is for first time monitored, PG~1001+291 was previously monitored but our has much longer temporal baseline. detect lags variations broad H$\beta$, H$\gamma$, Fe {\sc ii} lines respect to those 5100~{\AA} continuum....
We compile a sample of 92 active galactic nuclei (AGNs) at z<0.75 with $gri$ photometric light curves from the archival data Zwicky Transient Facility and measure accretion disk sizes via continuum reverberation mapping. employ Monte Carlo simulation tests to assess influences sampling broad emission lines select out adequately high cadences (3 days apart in average) minimum contaminations lines. The inter-band time delays individual AGNs are calculated using interpolated...
Abstract Finding nearby neutron stars can probe the supernova and metal-enrichment histories near our solar system. Recently, Lin et al. reported an exciting star candidate, Two Micron All Sky Survey J15274848+3536572 (hereafter J1527), with a small Gaia distance of 118 pc. They claim that J1527 harbors unseen candidate unusually low mass 0.98 ± 0.03 M ⊙ . In this work, we use Canada–France–Hawaii Telescope high-resolution spectrum to measure J1527's orbital inclination independently. Our...
Abstract Continuum reverberation mapping with high-cadence, long-term UV/optical monitoring of active galactic nuclei (AGNs) enables us to resolve the AGN central engine sizes on different timescales. The frequency-resolved time lags NGC 5548 (the target for STORM I campaign) are inconsistent X-ray reprocessing classical Shakura–Sunyaev disk model. Here we show that in can be well produced by Corona-Heated Accretion-disk Reprocessing (CHAR) Moreover, make CHAR model predictions Mrk 817,...
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...
NGC 5548 is one of the active galactic nuclei (AGN) selected for our long-term spectroscopic monitoring with Lijiang 2.4~m telescope, aiming at investigating origin and evolution broad-line regions (BLRs), accurately measuring mass supermassive black holes (SMBHs), understanding structure AGN. We have performed five-season observations NGC~5548 median sampling interval ranging from 1.25 to 3 days. The light curves 5100~\AA\ continuum broad emission lines are measured after subtracting...
Changing-look active galactic nucleus NGC~4151, which has attracted a lot of attention, is undergoing the second dramatic outburst stage in its evolutionary history. To investigate geometry and kinematics broad-line region (BLR), measure mass supermassive black hole we perform seven-month photometric spectroscopic monitoring program 2020--2021, using 2.4 m telescope at Lijiang Observatory. We successfully time lags responses from broad \ha, \hb, \hg, \hei, \heii\ emission lines to continuum...
Two self-assembled monolayers (SAMs), 6-mercaptonicotinic acid (6-MNA) and hydrophobic heptadecafluorodecyltrimethoxysilane (FAS-17), are used to specifically modify the two surfaces of a piezoresistive SiO2 cantilever for functionalizations both specific explosive-sensing improvement non-specific molecular-adsorption suppression. With dual-SAM modification technique, on-chip-integrated ultra-sensitive microcantilever sensor behaves more sensitively has quicker sensing properties trace...
Abstract We report results of the first reverberation mapping campaign I Zwicky 1 during 2014–2016, which showed unambiguous reverberations broad H β line emission in varying optical continuum. From analysis using several methods, we obtain a lag <?CDATA ${\tau }_{{\rm{H}}\beta }={37.2}_{-4.9}^{+4.5}\,\mathrm{days}$?> . Taking virial factor ${f}_{{}_{\mathrm{BLR}}}=1$?> , find black hole mass ${M}_{\bullet }={9.30}_{-1.38}^{+1.26}\times {10}^{6}{M}_{\odot }$?> from mean spectra. The...