  We present a realization of a magneto-optical trap of mercury atoms on the
intercombination line. We report on trapping of all stable mercury isotopes. We
characterize the effect of laser detuning, laser intensity, and gradient field
on the trapping performance of our system. The atom number for the most
abundant isotope Hg-202 is 50 million atoms. Moreover, we study the difference
in cooling processes for bosonic and fermionic isotopes. We observe agreement
with the Doppler cooling theory for the bosonic species and show sub-Doppler
cooling for the fermionic species. We reach a phase space density of a few
parts in 10^-6, which consitutes a promising starting condition for dipole trap
loading and evaporative cooling.
