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

The group of galaxies around 3C 275.1

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

1</sup> N. Copernicus Astronomical Center, Astrophysical Lab., Toru, Poland
² Toru Centre for Astronomy, Toru, Poland

Received 23 April 1997 / Accepted 28 January 1998

Abstract

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 respectively.

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

• 1. Introduction
• 2. Properties of the group of galaxies and extended narrow- emission line nebulosity
• 3. Oblique shocks and non-collinearity of the radio structure of 3C 275.1
  • 3.1. Jet velocity and orientation
  • 3.2. Non-relativistic oblique shock
  • 3.3. Relativistic oblique shock
• 4. Conclusions
• Acknowledgements
• Appendix
  • Appendix A
  • Appendix B
  • Appendix C
• References

© European Southern Observatory (ESO) 1998

Online publication: May 15, 1998

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