We report the detection of a 5.8 × 104 s periodicity in the 0.5-10 keV X-ray light curve of the Seyfert galaxy IRAS 18325-5926, obtained from a 5-dASCA observation. Nearly nine cycles of the periodic variation are seen; it shows no strong energy dependence and has an amplitude of about 15 per cent. Unlike most other well-studied Seyfert galaxies, there is no evidence for strong power-law red noise in the X-ray power spectrum of IRAS 18325-5926. Scaling from the QPOs found in Galactic black hole candidates suggests that the mass of the black hole in IRAS 18325-5926 is ∼6 × 106-4 × 107 M⊙.
|Original language||English (US)|
|Journal||Monthly Notices of the Royal Astronomical Society|
|State||Published - Mar 21 1998|
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science