NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-17 T17:47:35 PDT
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For refcode 2005ApJ...625L..39M:
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Copyright by American Astronomical Society. Reproduced by permission
2005ApJ...625L..39M Low-Luminosity Active Galactic Nuclei as Analogs of Galactic Black Holes in the Low/Hard State: Evidence from X-Ray Timing of NGC 4258 A. Markowitz and P. Uttley Abstract. We present a broadband power spectral density function (PSD) measured from extensive RXTE monitoring data of the low-luminosity active galactic nucleus (LLAGN) NGC 4258, which has an accurate, maser-determined black hole mass of (3.9+/-0.1)x10^7^ M_sun_. We constrain the PSD break timescale to be greater than 4.5 days at >90% confidence, which appears to rule out the possibility that NGC 4258 is an analog of black hole X-ray binaries (BHXRBs) in the high/soft state. In this sense, the PSD of NGC 4258 is different from those of some more luminous Seyfert galaxies, which appear similar to the PSDs of high/soft state X-ray binaries. This result supports previous analogies between LLAGNs 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. Keywords: Galaxies: Active, Galaxies: Individual: NGC 4258, X-Rays: Galaxies
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