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Research on the central region of quasars based on variability and structure function

Xuan Wei, J. Tang, Yu Tao, XiaoHan Zhang

Abstract

Quasars,asextremelyluminousanddistantspecialcelestialbodiesintheuniverse,aredrivenbyacomplexsystemcomposedof supermassiveblackholesandsurroundingaccretiondisks.Thispaperadoptsatime-domainobservationstrategyandcombines the analysis of light curves with the construction of structure functions to indirectly reveal the physical essence of the central regionofquasarsfromtheperspectiveofvariability.Theresearchdataarederivedfromthelargesampleobservationdataofthe SloanDigitalSkySurvey(SDSS).Throughextensivedatastatisticsandcorrelationanalysis,aseriesofimportantfindingshave been obtained: the characteristic parameters of the structure function of quasars show significant correlations with luminosity, black hole mass, and Eddington ratio. That is, quasars with higher luminosity, larger black hole mass, and larger Eddington ratiohavelargerstructurefunctions.Forquasarsofthesameluminosity,thelargertheEddingtonratio,thesmallerthestructure function. However, the correlation between the structure function and redshift or rest wavelength is not significant, indicating that the variabilitycharacteristicsofquasars aremainly determined bytheir own physical propertiesandareminimallyaffected by the cosmologicalredshifteffect.

Research on the central region of quasars based on variability and structure function

Abstract

Quasars,asextremelyluminousanddistantspecialcelestialbodiesintheuniverse,aredrivenbyacomplexsystemcomposedof supermassiveblackholesandsurroundingaccretiondisks.Thispaperadoptsatime-domainobservationstrategyandcombines the analysis of light curves with the construction of structure functions to indirectly reveal the physical essence of the central regionofquasarsfromtheperspectiveofvariability.Theresearchdataarederivedfromthelargesampleobservationdataofthe SloanDigitalSkySurvey(SDSS).Throughextensivedatastatisticsandcorrelationanalysis,aseriesofimportantfindingshave been obtained: the characteristic parameters of the structure function of quasars show significant correlations with luminosity, black hole mass, and Eddington ratio. That is, quasars with higher luminosity, larger black hole mass, and larger Eddington ratiohavelargerstructurefunctions.Forquasarsofthesameluminosity,thelargertheEddingtonratio,thesmallerthestructure function. However, the correlation between the structure function and redshift or rest wavelength is not significant, indicating that the variabilitycharacteristicsofquasars aremainly determined bytheir own physical propertiesandareminimallyaffected by the cosmologicalredshifteffect.
Paper Structure (14 sections, 4 equations, 9 figures)

This paper contains 14 sections, 4 equations, 9 figures.

Table of Contents

  1. Introduction
  2. Samples and methods
  3. Samples
  4. Methods
  5. Structure function
  6. Correlation analysis
  7. Correlation analysis
  8. The dependence of the structure function on redshift
  9. The dependence of the structure function on the stationary wavelength
  10. The dependence of the structure function on luminosity
  11. The dependence of the structure function on the mass of the black hole
  12. The dependence of the structural function on the Eddington ratio
  13. The dependence of the structure function on the accretion rate
  14. Conclusions

Figures (9)

  • Figure 1: The dependence of the structure function on the redshift z. In the figure, restrictions are imposed on the black hole mass, the Eddington ratio, and the stationary wavelength, and 25 sub-sample sets are set up.
  • Figure 2: The dependence of the structure function on the rest-frame wavelength. In the figure, the black hole mass, Eddington ratio, and redshift are restricted, and 25 sub-sample sets are set.
  • Figure 3: The dependence of the structural function on luminosity. In the figure, restrictions were imposed on the Eddington ratio and redshift, and 25 sub-samples were set.
  • Figure 4: The dependence of the structure function on luminosity. In the figure, limits are imposed on the mass of the black hole and the redshift, and 25 sub-samples are set.
  • Figure 5: The dependence of the structure function on the mass of the black hole. In the figure, limits have been set on luminosity and redshift, and 24 sub-samples have been established.
  • ...and 4 more figures