Working Paper Article Version 1 This version is not peer-reviewed

Features of Structure and Absorption in the Jet-launching Region of M87

Version 1 : Received: 30 September 2019 / Approved: 1 October 2019 / Online: 1 October 2019 (16:01:28 CEST)

How to cite: Zhao, W.; Hong, X.; An, T.; Li, X.; Cheng, X.; Wu, F. Features of Structure and Absorption in the Jet-launching Region of M87. Preprints 2019, 2019100004 Zhao, W.; Hong, X.; An, T.; Li, X.; Cheng, X.; Wu, F. Features of Structure and Absorption in the Jet-launching Region of M87. Preprints 2019, 2019100004

Abstract

M87 is the best available source for studying the AGN jet-launching region. To enrich our knowledge of this region, with quasi-simultaneous observations using VLBA at 22, 43 and 86~GHz, we capture the images of the radio jet in M87 on a scale within several thousand Rs. Based on the images, we analyze the transverse jet structure and obtain the spectral-index distribution in the jet. We find that the absorption is enhanced at the collimation regions and the interruption of the jet. The external medium, which may not be uniform, may have contributed a lot to the absorption in the jet-launching region. Additionally, the temporal morphology of the jet in its launching region may be largely affected by the local, short-lived kink instability growing in itself.

Subject Areas

galaxies: individual (m87); galaxies: jets; galaxies: active; radio continuum: galaxies

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