HI Shells in the Milky Way

Details HI Shells in the Milky Way HI Shells in the Milky Way

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..331...67e&link_type=abstract

Extra-Planar Gas, ASP Conference Proceedings, Vol. 331. Edited by Robert Braun. Proceedings of the meeting held at Dwingeloo,

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We study properties of HI shells in the second quadrant of the Milky Way and their connection to HII regions. We use a catalog of HI shells created by the automatic identification algorithm HOLMES applied to the Leiden-Dwingeloo HI survey. The catalog contains nearly 300 shells in the second quadrant. Their average angular dimension is 5°, the average expansion velocity 8 km s-1 and the flattening {Δ b over Δ l} ≃ 0.8. Dimensions of shells at low z-coordinates (z ≤ 1 kpc) are not different from shells at high z-coordinates, but the high-z shells are more elongated than their low-z counterparts. We also study the connection between HI shells and HII regions and find that their longitudinal distributions match. We give an example of a connection between an HI shell and an HII region NGC 7538.

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