Further observations of the head-tail radio galaxy PKS 2247 + 11

Details Further observations of the head-tail radio galaxy PKS 2247 + 11 Further observations of the head-tail radio galaxy PKS 2247 + 11

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....93..113r&link_type=abstract

Astronomy and Astrophysics, vol. 93, no. 1-2, Jan. 1981, p. 113-120.

Astronomy and Astrophysics

Astrophysics

8

Galactic Radiation, Radio Galaxies, Depolarization, Galactic Rotation, Intergalactic Media, Interstellar Magnetic Fields, Plasma Density, Plasma Temperature, Polarized Radiation, Thermal Plasmas

Scientific paper

Observations of the head-tail radio galaxy PKS 2247+11, which is located in a poor Zwicky cluster, are presented. Maps of polarized emission at 5.0, 1.4, and 0.61 GHz are given, as well as further observations of total intensity. Rotation measures and projected magnetic field directions are derived. Thermal plasma densities are computed from the observed depolarization ratios. The radio-optical knot (Simkin and Ekers, 1979) is significantly polarized; the physical conditions inside this component are similar to those in the region of the tail near to the galaxy, consistent with the view that the knot is a component ejected almost in the direction of motion of the galaxy. The direction of the projected magnetic field in the near tail is perpendicular to the axis of the tail, in agreement with recent observations of jet sources, but in disagreement with the magneto- spheric model of tail sources. In the more distant, diffuse parts of the tail the magnetic field structure is more complex. The density and temperature of the intracluster medium are estimated: n ∼ 10-3 and T ∼ 2 10-7 K, with considerable uncertainty.

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