Detection of an X-ray periodicity in the Seyfert galaxy IRAS18325-5926

Details Detection of an X-ray periodicity in the Seyfert galaxy IRAS18325-5926 Detection of an X-ray periodicity in the Seyfert galaxy IRAS18325-5926

1998-01-23

arxiv.org/abs/astro-ph/9801226v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 Postscript figures, to be published in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.2951147

We report the detection of a 58 ks (16 hr) periodicity in the 0.5-10 keV X-ray light curve of the Seyfert galaxy IRAS18325-5926 (Fairall49), 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 (6-40) million solar masses.

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