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

doi:10.1016/S0920-5632(98)00274-6

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

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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 language	English (US)
Pages (from-to)	519-522
Number of pages	4
Journal	Nuclear Physics B - Proceedings Supplements
Volume	69
Issue number	1-3
DOIs	https://doi.org/10.1016/S0920-5632(98)00274-6
State	Published - Jan 1999

All Science Journal Classification (ASJC) codes

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

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10.1016/S0920-5632(98)00274-6

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

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⊙.",

author = "K. Iwasawa and Fabian, {A. C.} and Brandt, {W. N.} and H. Kunieda and Reynolds, {C. S.}",

year = "1999",

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T1 - The ASCA long observation of the seyfert galaxy IRAS18325-5926

T2 - Detection of an X-ray periodicity

AU - Iwasawa, K.

AU - Fabian, A. C.

AU - Brandt, W. N.

AU - Kunieda, H.

AU - Reynolds, C. S.

PY - 1999/1

Y1 - 1999/1

N2 - 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⊙.

AB - 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⊙.

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JO - Nuclear Physics B - Proceedings Supplements

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ER -

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

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