SIMBAD references

We present HST observations of previously undetected optical jets in the low-luminosity radio galaxies B20755+37 and B21553+24. We show that there is accurate spatial coincidence between optical and radio emission, implying that the former is likely to be synchrotron radiation. The physical properties of the jets are similar to those known previously: their radio-optical spectral indices are ≃0.7 and in B20755+37, the spectrum steepens between optical and X-ray wavelengths. Our results support the hypothesis that optical emission is detectable from jets orientated within ≃20° of the line of sight for the B2 sample.