1998A&A...334..427K

We have found that the quasar 3C 275.1 is located at the centre of the gravitational well of a group of galaxies characterized by relativistic radial velocity and velocity dispersion equal to 124414 and 297km/s respectively. The temperature of the ICM gas calculated from the,,β " model is about 6.7x10⁶K. We suggest that there is a cooling flow in the ICM at a deposition rate of about 140M_☉/yr. It supplies gas to the narrow-emission line region, in which the number density is equal to 0.4 and 2.3cm^–3 for homogeneous region and clouds of radii of 10kpc respectively. The 1.6GHz European VLBI Network image of the quasar core shows the elongation of radio structure at a distance ∼40mas from the core with a position angle about 255°. It may be the result of interactions between out-flowing plasma of the QSO and the nonuniform ionized gas emitting in forbidden [OII] and [OIII] emission lines. The non-collinearity of the radio structure of 3C 275.1 might be explained by an oblique shock of the plasma jet at the interface with the halo of a neighbouring galaxy or with clouds of ionized gas.