Detection of an X-ray periodicity in the Seyfert galaxy IRAS 18325-5926

K. Iwasawa, A. C. Fabian, W. N. Brandt, H. Kunieda, K. Misaki, C. S. Reynolds, Y. Terashima

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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 languageEnglish (US)
Pages (from-to)l20-l24
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - Mar 21 1998

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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