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Title:
Discovery of extended Faraday rotation compatible with spiral structure in an intervening galaxy at Z = 0.395 - New observations of PKS 1229 - 021
Authors:
Kronberg, Philipp P.; Perry, Judith J.; Zukowski, Edwin L. H.
Affiliation:
AA(Max-Planck-Institut für Radioastronomie, Bonn, Germany), AB(Cambridge University Institute of Astronomy, England), AC(Toronto, University, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 10, 1992, p. 528-535. Research supported by Alexander von Humboldt-Stiftung and NSERC. (ApJ Homepage)
Publication Date:
03/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Polarimetry, Faraday Effect, Galactic Structure, Interacting Galaxies, Quasars, Radio Jets (Astronomy), Absorption Spectra, Astronomical Maps, Line Spectra, Radio Astronomy, Spiral Galaxies, Very Large Array (Vla)
Astronomy Keywords:
galaxies: structure polarization quasars: individual (PKS 1229-021) techniques: interferometric
DOI:
10.1086/171104
Bibliographic Code:
1992ApJ...387..528K

Abstract

The damped Lyalpha and 21 cm absorption-line quasar PKS 1229-021 (z = 1.038) has been mapped in detail with the VLA at seven frequencies, with polarimetry. It has a radio jet, whose rotation measure distribution at 0".46 shows a clear and strong "oscillation" over its length, which is ˜35h65 kpc at the absorption-line redshift of 0.395. This new, extended, intervenor probe combined with the optical absorption spectrum, well studied by Briggs and coworkers, suggests that the intervenor at z = 0.395 is a "bisymmetric magnetic field" spiral galaxy, possibly similar to M81. This galaxy is 200 times farther than the previous most distant galaxy whose large-scale magnetic field has been mapped.

A detailed analysis of the combined radio Faraday rotation and the absorption spectrum of PKS 1229-021 enables us, assuming an intervening spiral galaxy disk, to specify the orientation, inclination, magnetic field reversal scale, and magnetic field strength in the intervenor of PKS 1229-021. Our model also predicts the position of its nucleus (which has not yet been seen optically) relative to the QSO. Both the strength and the reversal scale of the magnetic field appear similar to those recently determined for nearby galaxies. We estimate a magnetic field strength of order 1-4 muG. We briefly discuss the implications of the existence of a bisymmetric spiral (m = 1) field at z = 0.395 for possible values of seed fields on the assumption that the galaxy field was amplified by a dynamo.


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