Radio to X-ray Spectrum

Unfortunately, there is no information on the radio spectrum of the jet. We have only PRM's statement that the average excess brightness of the jet above the background lobe emission is estimated to be about 10 mJy (7.''5 beam)$^{-1}$ at $\lambda$ 20 cm. Over the length of the detected X-ray jet, we then estimate a total 20 cm flux density of 152 mJy, with large uncertainties. The spectral index between 20 cm and 1 keV is $\alpha_{\rm {rx,jet}}$ = 0.87, which is similar to $\alpha_{\rm {r}}$ = 0.85, the spectral index for the entire radio source for $\nu$ $>$ 400 MHz (PRM). This value of $\alpha_{\rm {rx,jet}}$ may also be compared with the index within the Chandra band of $\alpha_{\rm {x,jet}}$ = 0.94 $^{+0.43}_{-0.49}$. Given the errors, it is not out of the question that the jet has a constant spectral index from GHz frequencies to 10 keV, but the radio spectrum is needed to check this. Simply joining the radio and X-ray flux densities with $\alpha_{\rm {rx}}$ = 0.87 implies a total optical magnitude for the jet of V $\simeq$ 23 mag, and an optical surface brightness of V $\simeq$ 29 mag (arc sec)$^{-2}$. The fact that the jet has not been detected in the optical is consistent with these numbers.