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We provide a new distance estimate to the supernova remnant (SNR) Kes 73 andits associated anomalous X-ray pulsar (AXP) 1E 1841-045. 21 cm HI images and HIabsorption/ emission spectra from new VLA observations, and 13CO emissionspectra of Kes 73 and two adjacent compact HII regions (G27.276+0.148 andG27.491+0.189) are analyzed. The HI images show prominent absorption featuresassociated with Kes 73 and the HII regions. The absorption appears up to thetangent point velocity giving a lower distance limit to Kes 73 of 7.5 kpc,which has previously been given as the upper limit. Also, G27.276+0.148 andG27.491+0.189 are at the far kinematic distances of their radio recombinationline velocities. There is prominent HI emission in the range 80--90 km/s forall three objects. The two HII regions show HI absorption at ~ 84 km/s, butthere is no absorption in the Kes 73 absorption spectrum. This implies an upperdistance limit of ~ 9.8 kpc to Kes 73. This corrected larger distance to Kes73/ AXP 1E 1841-045 system leads to a refined age of the SNR of 500 to 1000 yr,and a ~ 50% larger AXP X-ray luminosity.

The Distance and Age of the SNR Kes 73 and AXP 1E 1841-045