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Aims: The TeV BL Lac object Markarian 501 is a complex, core dominated radiosource, with a one sided, twisting jet on parsec scales. In the present work,we attempt to extend our understanding of the source physics to regions of theradio jet which have not been accessed before.  Methods: We present new observations of Mrk 501 at 1.4 and 86 GHz. The 1.4GHz data were obtained using the Very Large Array (VLA) and High SensitivityArray (HSA) in November 2004, in full polarization, with a final r.m.s. noiseof 25 microJy/beam in the HSA total intensity image; the 86 GHz observationswere performed in October 2005 with the Global Millimeter VLBI Array (GMVA),providing an angular resolution as good as 110 x 40 microarcseconds.  Results: The sensitivity and resolution provided by the HSA make it possibleto detect the jet up to ~700 milliarcseconds (corresponding to a projectedlinear size of ~500 pc) from its base, while the superior resolution of the 86GHz GMVA observations probes the innermost regions of the jet down to ~200Schwarzschild radii. The brightness temperature at the jet base is in excess of6e10 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 brightnessvs. distance from the core reveal a magnetic field parallel to the jet axis.

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