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The resolution power of current Imaging Atmospheric Cherenkov Telescopes ispresently restricted to scales of a few arcminutes. In the very high-energy(VHE; E > 100 GeV) gamma-ray regime, the measurement of source sizes that arecomparable to or smaller than the resolution of the instrument is usuallylimited by statistics and in particular by the uncertainties in thecharacterisation of the instrument Point Spread Function (PSF). The PSF variesstrongly with observation and instrument conditions, demanding time-dependentsimulations of these conditions. Employing such simulations, we substantiallyimprove our understanding of the H.E.S.S. PSF and are now able to probe sourceextensions well below one arcminute scale. We present the results of this newapproach applied to known VHE gamma-ray sources and show how this enables us toreveal for the first time the extension of the Crab nebula at TeV gamma-rayenergies, with a width of 52 arcsec assuming a Gaussian source shape.

Advanced search for the extension of unresolved TeV sources with H.E.S.S.: First measurement of the extension of the Crab nebula at TeV energies