We present results of a method for an automatic search for HI shells in 3D
data cubes and apply it to the Leiden-Dwingeloo HI survey of the northern Milky
Way. In the 2nd Galactic quadrant, where identifications of structures are not
substantially influenced by overlapping, we find nearly 300 structures. The
Galactic distribution of shells has an exponential profile in the radial
direction with a scale length of 3 kpc. In the z direction, one half of the
shells are found at distances smaller than 500 pc. We also calculate the
energies necessary to create the shells: there are several structures with
energies greater than 10 E_SN but only one with an energy exceeding 100 E_SN.
Their size distribution, corrected for distance effects, is approximated by a
power-law with an index 2.1. Our identifications provide a lower limit to the
filling factor of shells in the outer Milky Way: f_2D = 0.4 and f_3D = 0.05.Comment: accepted by A&A; 14 pages, 15 figures (3 multiple
