The ASCA long observation of the Seyfert galaxy IRAS18325-5926: detection of an X-ray periodicity

Details The ASCA long observation of the Seyfert galaxy IRAS18325-5926: detection of an X-ray periodicity The ASCA long observation of the Seyfert galaxy IRAS18325-5926: detection of an X-ray periodicity

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..69..519i&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 69, Issue 1-3, p. 519-522.

Physics

Nuclear Physics

Scientific paper

We report the detection of a 5.8x104s (~16hr) periodicity in the 0.5-10keV 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 ~107Msolar.

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