Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...587..701f&link_type=abstract
The Astrophysical Journal, Volume 587, Issue 2, pp. 701-713.
Astronomy and Astrophysics
Astronomy
62
Galaxy: Disk, Galaxy: Structure, Ism: H Ii Regions, Radio Lines: Ism
Scientific paper
The Very Large Array was used to observe H I absorption against 20 compact and ultracompact H II (UC H II) regions, thereby resolving the kinematic distance ambiguity to these sources. Combining these results with other sources whose distances were resolved through H I absorption, the half-width at half-maximum of the distribution of source height above and below the Galactic plane is found to be 35+/-2 pc within the solar circle. The vertical height distribution is used to investigate the predictive accuracy of the Galactic latitude in resolving the kinematic distance ambiguity to UC H II regions without the need for H I observations. For a large difference between far and near kinematic distances, high accuracy can be achieved by choosing the kinematic distance closer to 1.84|b|-1 kpc, where b is the Galactic latitude in degrees.
Churchwell Edward
Fish Vincent Louis
Reid Mark J.
Wilner David J.
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