Xu Fan Hu
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View article: Numerical investigation of instabilities in over-pressured magnetized relativistic jets
Numerical investigation of instabilities in over-pressured magnetized relativistic jets Open
Context. Relativistic jets from active galactic nuclei are observed to be collimated on the parsec scale. When the pressure between the jet and the ambient medium is mismatched, recollimation shocks and rarefaction shocks are formed. Previ…
View article: Numerical Investigation of Instabilities in Over-pressured Magnetized Relativistic Jets
Numerical Investigation of Instabilities in Over-pressured Magnetized Relativistic Jets Open
Context. Relativistic jets from Active Galactic Nuclei are observed to be collimated on the parsec scale. When the pressure between the jet and the ambient medium is mismatched, recollimation shocks and rarefaction shocks are formed. Previ…
View article: Could the Interband Lag of Active Galactic Nucleus Vary Randomly?
Could the Interband Lag of Active Galactic Nucleus Vary Randomly? Open
The interband lags among the optical broad-band continua of active galactic nuclei (AGNs) have been intensively explored over the past decade. However, the nature of the lags remains under debate. Here, utilizing two distinct scenarios for…
View article: Could the inter-band lag of active galactic nucleus vary randomly?
Could the inter-band lag of active galactic nucleus vary randomly? Open
The inter-band lags among the optical broad-band continua of active galactic nuclei (AGNs) have been intensively explored over the past decade. However, the nature of the lags remains under debate. Here utilizing two distinct scenarios for…
View article: Extreme Variability Quasars in Their Various States. II. Spectral Variation Revealed with Multiepoch Spectra
Extreme Variability Quasars in Their Various States. II. Spectral Variation Revealed with Multiepoch Spectra Open
We previously built a sample of 14,012 extremely variable quasars (EVQs) based on Sloan Digital Sky Survey (SDSS) and Pan-STARRS1 photometric observations. In this work we present the spectral fitting to their SDSS spectra and study the sp…
View article: How Can the Optical Variation Properties of Active Galactic Nuclei Be Unbiasedly Measured?
How Can the Optical Variation Properties of Active Galactic Nuclei Be Unbiasedly Measured? Open
The variability of active galactic nuclei (AGNs) is ubiquitous, but has not yet been understood. Measuring the optical variation properties of AGNs, such as the variation timescale and amplitude, and then correlating them with their fundam…
View article: Extreme Variability Quasars Catalog from SDSS DR16Q
Extreme Variability Quasars Catalog from SDSS DR16Q Open
We provide all 20,069 available spectral measurements of 14,012 EVQs selected in Ren et al. 2022. Repeated observed spectra of a same EVQ will have the same SDSS NAME with different spectral info (PLATE,MJD, and FIBER). We include the SPEC…
View article: How can the optical variation properties of active galactic nuclei be unbiasedly measured?
How can the optical variation properties of active galactic nuclei be unbiasedly measured? Open
The variability of active galactic nuclei (AGNs) is ubiquitous but has not yet been understood. Measuring the optical variation properties of AGNs, such as variation timescale and amplitude, and then correlating them with their fundamental…
View article: Data and Software for: How can the optical variation properties of active galactic nuclei be unbiasedly measured
Data and Software for: How can the optical variation properties of active galactic nuclei be unbiasedly measured Open
Codes and data of the paper How can the optical variation properties of active galactic nuclei be unbiasedly measured. The structure of this repository is as follows: DRW_library.py module for generating and fitting DRW light curves  …