/ftp/cats/aliases/K/./KJB2003



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J/ApJ/582/756       Galactic HII region velocities         (Kolpak+, 2003)
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	table1.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJ/582/756
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Beginning of ReadMe : J/ApJ/582/756 Velocities of HII regions (Kolpak+, 2003) ================================================================================ Resolving the kinematic ambiguity toward galactic H II regions. Kolpak M.A., Jackson J.M., Bania T.M., Clemens D.P., Dickey J.M. <Astrophys. J. 582, 756 (2003)> =2003ApJ...582..756K ================================================================================ ADC_Keywords: H II regions ; Radial velocities ; Radio lines Keywords: Galaxy: general - Galaxy: structure - H II regions - ISM: atoms - radio lines: ISM - techniques: spectroscopic Abstract: Kinematic distance determinations in the inner Galaxy are hampered by the near-far kinematic distance ambiguity. Here we resolve the ambiguity for 49 HII region complexes with known recombination-line velocities in the first Galactic quadrant. We measured the 21cm HI absorption spectrum toward each source with the Very Large Array in the C array. The maximum velocity of HI absorption was used to discriminate between the near and far kinematic distances. The number ratio of far to near sources,  3, can be entirely explained as a geometrical effect. The kinematic distances that we derive are compared with previous determinations for the same sources. Although our distance determinations are largely in agreement with previous measurements, there are 22 discrepancies that we discuss. Using our distance determinations, we create a face-on Galactic map of the HII region complexes and compare it with a kinematically derived profile of the distribution of CO-traced molecular hydrogen. The HII region complexes delineate the large-scale features seen in the molecular gas. The 5kpc molecular ring and the Sagittarius spiral arm are clearly evident, and a few HII region complexes lie in the Perseus arm. Description: The data presented here were collected in 2000 March and April using the NRAO VLA in the C-array configuration in the L band. The correlator was configured to have a total bandwidth of 1.6MHz, 128 channels, and 12.2kHz/channel, corresponding to a velocity resolution of 2.6km/s/channel.