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The X-ray emission from the jets in Active Galactic Nuclei (AGN) carriesimportant information on the distributions of relativistic electrons andmagnetic fields on large scales. We reanalyze archival Chandra observations onthe jet of M87 from 2000 to 2016 with a total exposure of 1460 kiloseconds toexplore the X-ray emission characteristics along the jet. We investigate thevariability behaviours of the nucleus and the inner jet component HST-1, andconfirm indications for day-scale X-ray variability in the nucleuscontemporaneous to the 2010 high TeV gamma-ray state. HST-1 shows a generaldecline in X-ray flux over the last few years consistent with its synchrotroninterpretation. We extract the X-ray spectra for the nucleus and all knots inthe jet, showing that they are compatible with a single power-law within theX-ray band. There are indications of the resultant X-ray photon index toexhibit a trend, with slight but significant index variations ranging from$\simeq 2.2$ (e.g. in knot D) to $\simeq 2.4-2.6$ (in the outer knots F, A, andB). When viewed in a multi-wavelength context, a more complex situation isarising. Fitting the radio to X-ray spectral energy distributions (SEDs)assuming a synchrotron origin, we show that a broken power-law electronspectrum with break energy $E_b$ around $1~(300\mu G/B)^{1/2}$ TeV allows asatisfactorily description of the multi-band SEDs for most of the knots.However, in the case of knots B, C and D we find indications that an additionalhigh energy component is needed to adequately reproduce the broadband SEDs. Wediscuss the implications and suggest that a stratified jet model may accountfor the differences.

The energy distribution of relativistic electrons in the kilo-parsec scale jet of M87 with Chandra