Intraday polarization variability outside the VLBI core of the active galactic nucleus 0716+714

Details Intraday polarization variability outside the VLBI core of the active galactic nucleus 0716+714 Intraday polarization variability outside the VLBI core of the active galactic nucleus 0716+714

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.313..627g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 313, Issue 3, pp. 627-636.

Astronomy and Astrophysics

Astronomy

18

Polarization, Galaxies: Active, Bl Lacertae Objects: Individual: 0716+714, Radio Continuum: Galaxies

Scientific paper

Rapid (`intraday') cm-wavelength variations in both total and polarized flux density have been observed in a number of strong extragalactic radio sources. It is difficult to explain these variations purely as propagation effects, but if they are intrinsic to the sources, implausibly high brightness temperatures are required. We discuss here rapid polarization variability during our λ=6cm global very long-baseline interferometry (VLBI) observations of the active galactic nucleus 0716+714. Measurements made with the Very Large Array (VLA) during the VLBI observations indicate a ~=50 deg swing in the position angle χ of the VLA core polarization in 12 hours. Corresponding variations were observed only for short VLBI baselines, so that they could not have occurred in the VLBI core (the only feature detected in our VLBI polarization map). The fact that the variations appear both in the VLA data and in the VLBI data for short baselines makes it difficult to explain them as instrumental effects. This leads us to conclude that the rapid variations occurred outside the area covered by our VLBI map; we estimate that the variability occurred in some compact feature roughly 25milliarcseconds from the nucleus. It is clear that compact structures on a wide range of scales must be taken into account in studies of intraday variability in AGN.

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