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          Institute: MPI für extraterrestrische Physik     Collection: Theory & Complex Plasmas     Display Documents

ID: 5963.0, MPI für extraterrestrische Physik / Theory & Complex Plasmas
Detection of a high frequency break in the X-ray power spectrum of Ark 564
Authors:Papadakis, I. E.; Brinkmann, W.; Negoro, H.; Gliozzi, M.
Date of Publication (YYYY-MM-DD):2002-01
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:1
Start Page:L1
End Page:L4
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a power spectrum analysis of the long ASCA observation of Ark 564 in June/July 2001. The observed power spectrum covers a frequency range of similar to 3.5 decades. We detect a high frequency break at similar to 2 x 10(-3) Hz. The power spectrum has an rms of similar to30% and a slope of similar to -1 and similar to-2 below and above the break frequency. When combined with the results from a long RXTE observation (Pounds et al. 2001), the observed power spectra of Ark 564 and Cyg X-1 (in the low/hard state) are almost identical, showing a similar shape and rms amplitude. However, the ratio of the high frequency breaks is very small (similar to10(3-4)), implying that these characteristic frequencies are not indicative of the black hole mass. This result supports the idea of a small black hole mass/high accretion rate in Ark 56
Free Keywords:galaxies : active; galaxies : Seyfert; galaxies : individual : Ark 564; X-rays : galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Fdn Res & Technol Hellas, IESL, POB 1527, Iraklion 71110,; Crete, Greece; Fdn Res & Technol Hellas, IESL, Iraklion 71110, Crete, Greece; Univ Crete, Dept Phys, Iraklion 71003, Greece; Max Planck Inst Extraterr Phys, D-85740 Garching, Germany; RIKEN, Cosm Radiat lab, Wako, Saitama 35101, Japan
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