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Abstract: New HI images from the VLA Galactic Plane Survey show prominent absorptionfeatures associated with the supernovae remnant G23.3-0.3 SNR W41. Wehighlight the HI absorption spectra and the $^{13}$CO emission spectra of eightsmall regions on the face of W41, including four HII regions, three non-thermalemission regions and one unclassified region. The maximum velocity ofabsorption for W41 is 78$\pm$2 km-s and the CO cloud at radial velocity95$\pm$5 km-s is behind W41. Because an extended TeV source, a diffuse X-rayenhancement and a large molecular cloud at radial velocity 77$\pm$5 km-s arealso projected at the center of W41, these yield the kinematic distance of 3.9to 4.5 kpc for W41. For HII regions, our analyses reveal that both G23.42-0.21and G23.07+0.25 are at the far kinematic distances $\sim$9.9 kpc and $\sim$10.6 kpc respectively of their recombination-line velocities 103$\pm$0.5 km-sand 89.6$\pm$2.1 km-s respectively, G23.07-0.37 is at the near kinematicdistance 4.4$\pm$0.3 kpc of its recombination-line velocity 82.7$\pm$2.0km-s, and G23.27-0.27 is probably at the near kinematic distance 4.1$\pm$0.3kpc of its recombination-line velocity 76.1$\pm$0.6 km-s.

Autor: Denis A. Leahy, Wenwu Tian


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