The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds.

Details The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds. The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds.

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agn8.confe..17g&link_type=abstract

Proceedings of the 8th National Conference on AGN, held in Torino, Italy, May 19-22, 2008. Edited by L. Lanteri, C.M. Raiteri,

Physics

Scientific paper

We discuss the physics in regions of the radio jet of the TeV BL Lac Mrk501 never accessed before, using the High Sensitivity Array (HSA) at 1.4 GHz, and the Global Millimeter VLBI Array (GMVA) at 86 GHz. The sensitivity and resolution provided by the HSA make it possible to detect the jet up to ~700 milliarcseconds (corresponding to a projected linear size of ~500 pc) from its base, while the superior resolution of the mm-VLBI probes the innermost regions of the jet down to ~200 Schwarzschild radii. The brightness temperature at the jet base is in excess of 6e10 K. We find evidence of limb brightening on physical scales from ~1 pc to ~40 pc. Polarization images and fits to the trend of jet width and brightness vs. distance from the core reveal a magnetic field parallel to the jet axis.

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