Issue |
A&A
Volume 437, Number 1, July I 2005
|
|
---|---|---|
Page(s) | 101 - 112 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20034389 | |
Published online | 10 June 2005 |
H I shells in the outer Milky Way
Astronomical Institute, Academy of Sciences of the Czech Republic, Boční II 1401, 141 31 Prague 4, Czech Republic e-mail: sona@ig.cas.cz
Received:
24
September
2003
Accepted:
7
March
2005
We present results of a method for an automatic search for shells
in 3D data cubes and apply it to the Leiden-Dwingeloo
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
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
but only one with an energy exceeding
. Their size distribution, corrected for distance
effects, is approximated by a power-law with an index
.
Our identifications provide a lower limit to the filling factor of shells
in the outer Milky Way:
and
.
Key words: ISM: bubbles / ISM: structure / Galaxy: structure / methods: data analysis
© ESO, 2005
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