Oral Presentation
Multifrequency polarimetric observations of blazars with the KVN, SMA, and JCMT
Presenter: Minchul Kam (Seoul National University)
There are two different models of VLBI cores of blazars: (i) the standard Blandford and Konigl (BK) conical jet model, and (ii) a standing (recollimation) shock.
These two models can be tested by measuring the Faraday rotation measure (RM) at mm wavelengths: the core RM is expected to increase with frequency in the former case and to be independent of frequency in the latter case. Our previous studies using the KVN at 22, 43, 86 GHz and the optical data from Steward observatory suggest that the increase of the RM does not continue to optical wavelengths but saturates at frequencies of few 100 GHz. This implies that the radio core would be a recollimation shock located upstream of the BK jet that is optically thick at cm wavelengths. We expect that simultaneous observations with the SMA 230 GHz and JCMT 352 GHz will bridge the frequency gap between 86 GHz and optical wavelengths. This will enable us, for the first time, to confirm if the RM indeed saturates at mm and sub-mm wavelengths.
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