The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 39 Issue 2
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- Pages.73.2-73.2
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- 2014
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- 1226-2692(pISSN)
Insights on the rotation measure of the M87 jet on arc-second scales
- Algaba, Juan-Carlos (Korea Astronomy and Space Science Institute) ;
- Asada, Keiichi (Academia Sinica, Institute of Astronomy and Astrophysics) ;
- Nakamura, Masanori (Academia Sinica, Institute of Astronomy and Astrophysics)
- Published : 2014.10.13
Abstract
We investigate the rotation measure (RM) of the nearby low luminosity AGN M87 by using archival polarimetric VLA data at 8, 15, 22 and 43 GHz. For the first time, the RM properties of its jet are resolved at at arc-second scales. The distribution of the RM appears to be a gaussian with a mean value of ~200rad/m2 and the power spectrum follows a power law with index -2.5. A simple Kolmogorov model assuming a random turbulent magnetic fields extrinsic to the jet appears not to be adequate to explain the observed RM power spectra. On the other hand, underlying RM gradients possibly connected with the jet could be a possible interpretation.
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