Faraday tomography of the SS433 jet termination region

Haruka Sakemi, Mami Machida, Takumi Ohmura, Shinsuke Ideguchi, Yoshimitsu Miyashita, Keitaro Takahashi, Takuya Akahori, Hiroki Akamatsu, Hiroyuki Nakanishi, Kohei Kurahara, Jamie Farnes

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Abstract

A jet termination region provides us with useful information about how a jet interacts with the interstellar medium. Identifying the strength and orientation of magnetic fields at the terminal is crucially important to understanding the mechanism of cosmic-ray acceleration. In this article, we report results of our Faraday-tomography analysis of the eastern region of the radio nebula W50, where a jet from the microquasar SS433 seems to terminate. We apply QU-fitting, a method of Faraday-tomography, to data from the Australia Telescope Compact Array (ATCA) at 1.3-3.0 GHz. In the analysis, we distinguish multiple polarized sources along the line of sight. We identify Galactic emission candidates at Faraday depths around 0 rad m-2 and 300 rad m-2. The Galactic emission around 0 rad m-2 is possibly located in front of W50. We also find emission from W50 with Faraday depths between ϕ = -112 to 228 rad m-2.

Original languageEnglish
Article number137
JournalGalaxies
Volume6
Issue number4
DOIs
Publication statusPublished - Dec 9 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

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    Sakemi, H., Machida, M., Ohmura, T., Ideguchi, S., Miyashita, Y., Takahashi, K., Akahori, T., Akamatsu, H., Nakanishi, H., Kurahara, K., & Farnes, J. (2018). Faraday tomography of the SS433 jet termination region. Galaxies, 6(4), [137]. https://doi.org/10.3390/galaxies6040137