The ASCA long observation of the seyfert galaxy IRAS18325-5926: Detection of an X-ray periodicity

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

Research output: Contribution to journalArticle

Abstract

We report the detection of a 5.8 × 104 s (∼ 16 hr) periodicity in the 0.5-10 keV X-ray light curve of the Seyfert galaxy IRAS18325-5926, obtained from a 5-day ASCA observation. Nearly 9 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 IRAS18325-5926. Scaling from the QPOs found in Galactic black hole candidates suggests that the mass of the black hole in IRAS18325-5926 is ∼ 107M⊙.

Original languageEnglish (US)
Pages (from-to)519-522
Number of pages4
JournalNuclear Physics B - Proceedings Supplements
Volume69
Issue number1-3
DOIs
StatePublished - Jan 1999

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics

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