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Astron. Astrophys. 355, 44-50 (2000)

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Clues to the origin of parsec to kilo-parsec jet misalignments in EGRET sources

X. Cao

Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, P.R. China, and National Astronomical Observatories, Chinese Academy of Sciences, P.R. China
Beijing Astrophysical Center (BAC), Beijing, P.R. China

Received 17 March 1999 / Accepted 21 December 1999


The apparent position angle difference [FORMULA]PA between parsec and kilo-parsec jets in blazars can be related to the bending properties of the jets. We present correlations between the misalignment [FORMULA]PA and the ratio of radio to broad-line emission for a sample of [FORMULA]-ray blazars. The present study is limited to EGRET sources due to uniform data for the radio and optical properties of these sources being easily available. The broad-line emission is known to be a good indicator of the accretion power for both steep and flat-spectrum quasars. We find significant correlations between [FORMULA]PA and the ratio of radio flux (total and radio core flux respectively) to broad-line flux, which is consistent with the beaming scenario. A weak correlation between [FORMULA]PA and the ratio of extended radio to broad-line flux might imply that the intrinsic bend of the jet is related with the ratio of jet mechanical power to accretion power.

Key words: galaxies: active – galaxies: jets – galaxies: quasars: emission lines

Send offprint requests to: cxw@center.shao.ac.cn

© European Southern Observatory (ESO) 2000

Online publication: March 17, 2000