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Testing single-epoch BH mass estimators for AGNs

This study presents the testing of single-epoch black hole (BH) mass estimators for active galactic nuclei (AGNs). We analyze Hβ, Mg II, and C IV correlations using various methods including reverberation mapping and time separation cuts. The findings indicate that the virial assumption holds valid for Hβ, while Mg II and C IV do not exhibit consistent virial behavior. We also explore the impact of separation cuts and suggest that the broad emission line regions (BLRs) of Mg II and C IV differ from Hβ, with C IV showing improved behavior when iron-template subtraction is applied.

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Testing single-epoch BH mass estimators for AGNs

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  1. Testing single-epoch BH mass estimators for AGNs Rui She 2013-05-20

  2. Virial BH Mass: I. Reverberation Mapping (RM) II. Single-Epoch (SE) Methods

  3. Hβ - correlation

  4. Mg II - correlation

  5. C IV - correlation

  6. Mg II subset(having H)

  7. Time Separation Cut( > 5.5R): H

  8. Time Separation Cut( > 5.5R): Mg II

  9. Time Separation Cut( > 5.5R): C IV

  10. I. With narrow -line subtraction C IV more test

  11. II. With iron-template subtraction C IV more test

  12. III. With narrow -line and iron-template subtractions C IV more test

  13. Correlation: H

  14. measureing ranges: H

  15. measureing ranges: Mg II

  16. measureing ranges: C IV

  17. Conclusion • The virial assumption is found valid for H • MgII and CIV do not show a virial behavior. • Separation cuts do not change much. • MgII not showing virial behavior: • A luminosity effect ==> rule out • The BLRs of MgII and CIV may be different from that of H • For C IV, has better virial-like behavior with iron-template subtraction • varies a lot depending on measuring ranges.

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