HI shells in the Leiden-Dwingeloo HI survey

Details HI shells in the Leiden-Dwingeloo HI survey HI shells in the Leiden-Dwingeloo HI survey

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.289..279e&link_type=abstract

Astrophysics and Space Science, v. 289, Issue 3, p. 279-282 (2004).

Astronomy and Astrophysics

Astrophysics

4

Hi Shells, Hi Holes, An Automatic Identification, Leiden-Dwingeloo Hi Survey

Scientific paper

An algorithm of an automatic search for HI shells is presentedand results of identifications in the Leiden-DwingelooHI survey are shown. An identification algorithm searches forlocal minima in channel maps, then creates 3-dimensional objects,HI holes. There is no a priori constraint on the shape of an HI hole, only the dimension criterion: dimensions of the structuremust lie in a preselected interval.When this algorithm is applied to the Leiden-Dwingeloo HI survey,it finds about 1000 structures, which are seen in 4 or more consecutivevelocity channels (Δ v ≥ 4 kms-1. A total energy contained in all structures in the Milky Way is of theorder of 1055 erg, which is less than the energy correspondingto the observed SNR. 80% of the energy contained in holes resides at low galactic z-coordinates, |z|<2 kpc.

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