@inproceedings{oai:jaxa.repo.nii.ac.jp:00005274,
 author = {林田, 清 and Hayashida, Kiyoshi},
 book = {宇宙航空研究開発機構特別資料, JAXA Special Publication: Astrophysics with All-Sky X-Ray observations: 3rd International MAXI Workshop},
 month = {Feb},
 note = {Astrophysics with All-Sky X-Ray observations: 3rd International MAXI Workshop (RIKEN, 10-12 June 2008), X-ray variability of AGNs has been employed to constrain the size of the emission region as well as the mechanism of the emission. We propose an empirical method to estimate the black hole (BH) masses in AGNs from their X-ray variability and apply the method to various classes of AGNs, broad line Seyfert 1 galaxies (BLS1s), narrow line Seyfert 1 galaxies (NLS1s), and low luminosity AGNs (LLAGN). Stability of the power spectrum density is examined, and alternative definitions of the variability time scales are compared. Comparison with independent BH mass estimation indicates X-ray variability provides order of magnitude estimation for the BH mass scale, though deviation is evident in some cases. Further studies with various AGNs at various flux states reveal how the X-ray variability is affected by other parameters than BH mass, e.g., accretion rate or class of AGNs. We expect for long term observations with MAXI to provide clue to such an issue., 資料番号: AA0064306035, レポート番号: JAXA-SP-08-014E},
 pages = {174--179},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {Relation between X-ray black hole mass and X-ray variability: Expectation for MAXI},
 volume = {JAXA-SP-08-014E},
 year = {2009}
}