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2004ApJS..154..553S - Astrophys. J., Suppl. Ser., 154, 553-578 (2004/October-0)
Resolution of distance ambiguities of inner galaxy massive star formation regions. II.
SEWILO M., WATSON C., ARAYA E., CHURCHWELL E., HOFNER P. and KURTZ S.
Abstract (from CDS):
We examined the projected location of H II regions whose distance ambiguities have been resolved (in this work and other similar studies) in the Galactic plane and in a longitude-velocity diagram for a recognizable spiral arm pattern. Although the highest density of points in the position-position plot approximately follows the spiral arms proposed by Taylor & Cordes, the dispersion is still about as large as the separation between their proposed arms. The longitude-velocity plot shows an increase in the density of sources at the points where the spiral arm loci proposed by Taylor & Cordes are approaching the locus of tangent point velocities and a lower density between the arm loci. However, it is not possible to trace spiral arms over significant segments of Galactic longitude in the longitude-velocity plot. We conclude that a very large number of H II regions in combination with more sophisticated Galactic rotation models will be required to obtain a more continuous spiral pattern from kinematic studies of H II regions than from fully sampled surveys of H I or CO.
Abstract Copyright: ∼
Journal keyword(s): Galaxy: Disk - ISM: H II Regions - ISM: Molecules - Radio Lines: ISM - Stars: Formation
VizieR on-line data: <Available at CDS (J/ApJS/154/553): table1.dat table2.dat table3.dat table4.dat table5.dat table7.dat>
Nomenclature: Table 5: [SWA2004] GLL.ll+B.bb MC N, [SWA2004] GLL.lll+B.bbb MC N, N=249.
Simbad objects: 79
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