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

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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Abstract

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 language	English (US)
Pages (from-to)	l20-l24
Journal	Monthly Notices of the Royal Astronomical Society
Volume	295
Issue number	1
State	Published - Mar 21 1998

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Cite this

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title = "Detection of an X-ray periodicity in the Seyfert galaxy IRAS 18325-5926",

abstract = "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⊙.",

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

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TY - JOUR

T1 - Detection of an X-ray periodicity in the Seyfert galaxy IRAS 18325-5926

AU - Iwasawa, K.

AU - Fabian, A. C.

AU - Brandt, W. N.

AU - Kunieda, H.

AU - Misaki, K.

AU - Reynolds, C. S.

AU - Terashima, Y.

PY - 1998/3/21

Y1 - 1998/3/21

N2 - 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⊙.

AB - 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⊙.

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SN - 0035-8711

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

Abstract

All Science Journal Classification (ASJC) codes

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