VSOP monitoring of the compact BL Lac object AO 0235+164

Abstract

In 1999, the highly compact and variable BL Lac object AO 0235+164 was identified as the highest brightness temperature active galactic nucleus observed with the VLBI Space Observatory Programme (VSOP), with T_B > 5.8 x 10^{13} K. The sub-milliarcsecond radio structure of this source has been studied with dual-frequency (1.6 and 5 GHz), polarization-sensitive VSOP observations during 2001 and 2002. Here we present the results of this monitoring campaign. At the time of these observations, the source was weakly polarized and characterized by a radio core that is clearly resolved on space-ground baselines.

6 pages, 5 figures, accepted for the Publ. Astron. Soc. Japan, Vol. 57, No. 6, VSOP Special Issue (2005)

References in corpus (5)

• Multi-Epoch VLBA Observations of EGRET-Detected Quasars and BL Lac Objects: Superluminal Motion of Gamma-Ray Bright Blazars
• Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. IV. Fine Scale Structure
• Optical and radio variability of the BL Lac object AO 0235+16: a possible 5-6 year periodicity
• Helical jets in blazars. Interpretation of the multifrequency long-term variability of AO 0235+16
• The WEBT campaign to observe AO 0235+16 in the 2003-2004 observing season

Cited by in corpus (5)

• Multifrequency variability of the blazar AO 0235+164. The WEBT campaign in 2004-2005 and long-term SED analysis
• Harmonic QPOs and Thick Accretion Disk Oscillations in BL Lac Object AO 0235+164
• Supermassive binary black holes among cosmic gamma-ray sources
• Spectroscopic monitoring of the BL Lac object AO 0235+164
• J0906+6930: a radio-loud quasar in the early Universe