Optical structure and polarization of the western hot spot of Pictor A

Details Optical structure and polarization of the western hot spot of Pictor A Optical structure and polarization of the western hot spot of Pictor A

1995-05-26

arxiv.org/abs/astro-ph/9505122v1

Astronomy and Astrophysics

Astrophysics

uuencoded compressed postscript. The preprint is also available at http://www.ast.cam.ac.uk/preprint/PrePrint.html

Scientific paper

10.1086/187938

HST images of the western hot spot of the nearby FRII radio galaxy Pictor A resolve the hot spot into an amorphous region of highly polarized wisps. The high polarization (>~ 50%) indicates that the optical emission is synchrotron radiation and that the magnetic field structure has been well resolved. The magnetic field is oriented nearly perpendicular to the jet axis and apparently very uniform. We interpret these observations in terms of a compressed magnetic field at the working surface where the jet impinges on the intergalactic medium some 100 kpc from the nucleus of the host galaxy. Keywords: Polarization --- radiation mechanisms: nonthermal --- galaxies: active --- galaxies: individual: Pictor A --- galaxies: jets.

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