THE ASCA LONG OBSERVATION OF THE SEYFERT-GALAXY IRAS18325-5926 - DETECTION OF AN X-RAY PERIODICITY

Authors
IWASAWA K FABIAN AC BRANDT WN KUNIEDA H REYNOLDS CS
Citation
K. Iwasawa et al., THE ASCA LONG OBSERVATION OF THE SEYFERT-GALAXY IRAS18325-5926 - DETECTION OF AN X-RAY PERIODICITY, Nuclear physics. B, Proceedings supplement, 69(1-3), 1999, pp. 519-522
Citations number
17
Categorie Soggetti
Physics, Particles & Fields
Journal title
Nuclear physics. B, Proceedings supplement → ACNP
ISSN journal
09205632
Volume
69
Issue
1-3
Year of publication
1999
Pages
519 - 522
Database
ISI
SICI code
0920-5632(1999)69:1-3<519:TALOOT>2.0.ZU;2-2
Abstract
We report the detection of a 5.8 x 10(4) s (similar to 16 hr) periodic ity in the 0.5-10 keV X-ray light curve of the Seyfert galaxy IRAS1832 5-5926, 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 similar to 10(7) M..