Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-06
Astrophys.J. 625 (2005) L39-L42
Astronomy and Astrophysics
Astrophysics
Accepted for publication in The Astrophysical Journal Letters; 6 pages; 3 figures
Scientific paper
10.1086/430762
We present a broadband power spectral density function (PSD) measured from extensive RXTE monitoring data of the low-luminosity AGN NGC 4258, which has an accurate, maser-determined black hole mass of 3.9+/-0.1 * 10^7 solar masses. We constrain the PSD break timescale to be greater than 4.5 d at >90% confidence, which appears to rule out the possibility that NGC 4258 is an analogue of black hole X-ray binaries (BHXRBs) in the high/soft state. In this sense, the PSD of NGC 4258 is different to those of some more-luminous Seyferts, which appear similar to the PSDs of high/soft state X-ray binaries. This result supports previous analogies between LLAGN and X-ray binaries in the low/hard state based on spectral energy distributions, indicating that the AGN/BHXRB analogy is valid across a broad range of accretion rates.
Markowitz Alex
Uttley Phil
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