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We report on the X-ray properties of the radio galaxy NGC 4261, combininginformation from the XMM, Chandra, and SAX satellites. Goals of this study areto investigate the origin of the X-rays from this low-power radio galaxy andthe nature of the accretion process onto the central black hole. The X-rayspectrum of the nuclear source extending up to 100--150 keV is well describedby a partially covered (covering factor $>$ 0.8) power law with a photon index\~1.5 absorbed by a column density 5e22 cm^-2. The X-ray luminosity associatedwith the non-thermal component is ~5e41 erg/s. The nuclear source is embeddedin a diffuse hot gas (kT~0.6 keV), whose density profile implies a Bondiaccretion rate of 4.5e-2 solar masses/year. For the first time rapid X-rayvariability is detected in a low-power radio galaxy at more than 99% confidencelevel. The observed X-ray spectral and variability properties indicate theaccretion flow as the most likely origin of the bulk X-ray continuum.Thisconclusion is strengthened by energetic considerations based on a comparisonbetween the X-ray luminosity and the kinetic power of the jet, whichalsosuggest that the Bondi accretion rate overestimates the actual accretion rateonto the black hole.Comment: 12 pages, 6 figures, accepted for publication in A&

On the origin of the X-rays and the nature of accretion in NGC 4261