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Astron. Astrophys. 334, 427-438 (1998)

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The group of galaxies around 3C 275.1

J. Krempe-Krygier 1, B. Krygier 2 and G. Walentynowicz 2

1 N. Copernicus Astronomical Center, Astrophysical Lab., Toru, Poland
2 Toru Centre for Astronomy, Toru, Poland

Received 23 April 1997 / Accepted 28 January 1998


We have found that the quasar 3C275.1 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 297 [FORMULA] respectively.

The temperature of the ICM gas calculated from the " [FORMULA] " model is about [FORMULA]  K. We suggest that there is a cooling flow in the ICM at a deposition rate of about [FORMULA]. It supplies gas to the narrow-emission line region, in which the number density is equal to 0.4 and [FORMULA] for homogeneous region and clouds of radii of 10 [FORMULA] respectively. The 1.6 GHz European VLBI Network image of the quasar core shows the elongation of radio structure at a distance [FORMULA] from the core with a position angle about [FORMULA]. 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.

Key words: galaxies: clusters: individual: A 98 – quasars: individual: 3C 275.1 – cooling flows – galaxies: jets – intergalactic medium – radio continuum: galaxies

Send offprint requests to: J. Krempe-Krygier

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© European Southern Observatory (ESO) 1998

Online publication: May 15, 1998