Polarization VLBI observations of the gravitational lens system B0218 + 357 at 8.4 GHz

A. J. Kemball, A. R. Patnaik, R. W. Porcas

Research output: Contribution to journalArticlepeer-review

Abstract

We present polarization VLBI observations of the gravitational lens system B0218 + 357 at an observing frequency of 8.4 GHz. The lensed components A and B show a core-jet substructure at milli-arcsecond (mas) resolution, consistent with the quantitative lensing properties known for the system. The identified core is linearly polarized at a level of 8%-12%. The polarization position angle difference between A and B is consistent with the expected behavior of polarized emission under gravitational lensing and the known rotation due to differential Faraday rotation along the two lines of sight through the lensing galaxy. The mas polarization structure confirms the expected parity reversal for the two lensed components predicted by generic lens models for this system. Indirect evidence is presented in support of the BL Lacertae optical classification of the lensed object.

Original languageEnglish (US)
Pages (from-to)649-653
Number of pages5
JournalAstrophysical Journal
Volume562
Issue number2 PART II
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • Galaxies: Jets
  • Gravitational lensing
  • Polarization

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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