A5047326093- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Scientific Measurement and Uncertainty Evaluation
- Particle physics theoretical and experimental studies
- Statistical and numerical algorithms
- SAS software applications and methods
- Statistics Education and Methodologies
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Opportunistic and Delay-Tolerant Networks
- Advanced Data Storage Technologies
University of Illinois Urbana-Champaign
2022-2023
Xiamen University
2019-2022
Abstract We present a catalog of continuum and emission-line properties for 750,414 broad-line quasars included in the Sloan Digital Sky Survey Data Release 16 quasar (DR16Q), measured from optical spectroscopy. These cover broad ranges redshift (0.1 ≲ z 6) luminosity (44 log( L bol /erg s −1 ) 48), probe lower luminosities than an earlier compilation SDSS DR7 quasars. Derived physical quantities such as single-epoch virial black hole masses bolometric are also this catalog. improved...
Abstract Over three decades of reverberation mapping (RM) studies on local broad-line active galactic nuclei (AGNs) have measured reliable black hole (BH) masses for >100 AGNs. These RM measurements reveal a significant correlation between the Balmer region (BLR) size and AGN optical luminosity (the R – L relation). Recent samples with more diverse BH parameters (e.g., mass Eddington ratio) substantial intrinsic dispersion around average relation, suggesting that variations in broadband...
N-body simulations are essential tools in physical cosmology to understand the large-scale structure (LSS) formation of universe. Large-scale with high resolution important for exploring substructure universe and determining fundamental parameters like neutrino mass. However, traditional particle-mesh (PM) based algorithms use considerable amounts memory, which limits scalability simulations. Therefore, we designed a two-level PM algorithm CUBE towards optimal performance memory consumption...
Galaxy angular momentum directions (spins) are observable, well described by the Lagrangian tidal torque theory, and proposed to probe primordial universe. They trace spins of dark matter halos, indicators protohalos properties in space. We define a spin parameter twist parameters quantify their influence on conservation predictability mode reconstruction $N$-body simulations. conclude that more twisting environments preferentially rotation-supported, likely conserve direction through cosmic...
Over three decades of reverberation mapping (RM) studies on local broad-line active galactic nuclei (AGNs) have measured reliable black-hole (BH) masses for $> 100$ AGNs. These RM measurements reveal a significant correlation between the Balmer region size and AGN optical luminosity (the $R-L$ relation). Recent samples with more diverse BH accretion parameters (e.g., mass Eddington ratio) substantial intrinsic dispersion around average relation, suggesting variations in overall spectral...
We present a catalog of continuum and emission line properties for 750,414 broad-line quasars included in the Sloan Digital Sky Survey Data Release 16 quasar (DR16Q), measured from optical spectroscopy. These cover broad ranges redshift ($0.1\lesssim z\lesssim 6$) luminosity ($44\lesssim \log (L_{\rm bol}/{\rm erg\,s^{-1}})\lesssim 48$), probe lower luminosities than an earlier compilation SDSS DR7 quasars. Derived physical quantities such as single-epoch virial black hole masses bolometric...
Context. The soft excess, a surplus of X-ray photons above 2 keV with respect to power law, is feature debated physical origin found in the spectra many type-1 active galactic nuclei (AGN). eROSITA instrument aboard Spectrum-Roentgen-Gamma (SRG) mission will provide an all-sky census AGN suitable for spectral analysis. Aims. primary goal this work test variety models emission (thermal emission, non-thermal ionised absorption, or neutral partial covering absorption) help identify complexity....
The Dark Energy Spectroscopic Instrument (DESI) survey will provide optical spectra for $\sim 3$ million quasars. Accurate redshifts these quasars facilitate a broad range of science applications. Here we improved systemic redshift estimates the 95$k included in DESI Early Data Release (EDR), based on emission-line fits to quasar spectra. majority pipeline are reliable. However, 19\%$ EDR have that deviate from our new by $>500\,{\rm km\,s^{-1}}$. We use composite demonstrate improvement...
Abstract The Dark Energy Spectroscopic Instrument (DESI) survey will provide optical spectra for ∼3 million quasars. Accurate redshifts these quasars facilitate a broad range of science applications. Here we improved systemic redshift estimates the ∼95k included in DESI Early Data Release (EDR), based on emission-line fits to quasar spectra. majority pipeline are reliable. However, ∼19% EDR have that deviate from our new by >500 km s −1 . We use composite demonstrate improvement...
In the context of an evolutionary model, outflow phase Active Galactic Nuclei (AGN) occurs at peak its activity, once central SMBH is massive enough to generate sufficient power counterbalance potential well host galaxy. This plays a vital role in galaxy evolution. We aim apply various selection methods isolate powerful AGNs feedback phase, trace and characterise their outflows, explore link between AGN luminosity properties. applied combination eROSITA Final Equatorial Depth survey (eFEDS)...
Abstract The optical light curves of quiescent black hole low-mass X-ray binaries often exhibit significant nonellipsoidal variabilities, showing the photospheric radiation companion star is veiled by other sources emission. Assessing this “veiling” effect critical to mass measurement. Here in work, we carry out a strictly simultaneous spectroscopic and photometric campaign on prototype binary A0620-00. We find that for each observation epoch, extra flux beyond pure ellipsoidal modulation...