Detection of a high frequency break in the X-ray power spectrum of Ark 564

Details Detection of a high frequency break in the X-ray power spectrum of Ark 564 Detection of a high frequency break in the X-ray power spectrum of Ark 564

2001-12-29

arxiv.org/abs/astro-ph/0112562v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, A&A (Letters) in press

Scientific paper

10.1051/0004-6361:20011763

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 ~ 3.5 decades. We detect a high frequency break at ~ 0.002 Hz. The power spectrum has an rms of ~30% and a slope of ~ -1 and ~ -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 (~ 10e{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 564.

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