New HI images from the VLA Galactic Plane Survey show prominent absorption features associated with the supernovae remnant G23.3-0.3 ( SNR W41 ) .
We highlight the HI absorption spectra and the ^ { 13 } CO emission spectra of eight small regions on the face of W41 , including four HII regions , three non-thermal emission regions and one unclassified region .
The maximum velocity of absorption for W41 is 78 \pm 2 km/s and the CO cloud at radial velocity 95 \pm 5 km/s is behind W41 .
Because an extended TeV source , a diffuse X-ray enhancement and a large molecular cloud at radial velocity 77 \pm 5 km/s overlap the center of W41 , the kinematic distance is 3.9 to 4.5 kpc for W41 .
For the HII regions , our analysis shows that both G23.42-0.21 and 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/s and 89.6 \pm 2.1 km/s respectively ) , G23.07-0.37 is at the near kinematic distance ( 4.4 \pm 0.3 kpc ) of its recombination-line velocity ( 82.7 \pm 2.0 km/s ) , and G23.27-0.27 is probably at the near kinematic distance ( 4.1 \pm 0.3 kpc ) of its recombination-line velocity ( 76.1 \pm 0.6 km/s ) .