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We suggest a revised distance to the supernova remnant (SNR) G109.1-1.0 (CTB109) and its associated anomalous X-ray pulsar (AXP) 1E 2259+586 by analyzing21cm HI-line and 12CO-line spectra of CTB 109, HII region Sh 152, and theadjacent molecular cloud complex. CTB 109 has been established to beinteracting with a large molecular cloud (recession velocity at v=-55 km s^-1).The highest radial velocities of absorption features towards CTB 109 (-56 kms^-1) and Sh 152 (-65 km s^-1) are larger than the recombination line velocity(-50 km s^-1) of Sh 152 demonstrating the velocity reversal within the Perseusarm. The molecular cloud has cold HI column density large enough to produce HIself-absorption (HISA) and HI narrow self-absorption (HINSA) if it was at thenear side of the velocity reversal. Absence of both HISA and HINSA indicatesthat the cloud is at the far side of the velocity reversal within the PerseusArm, so we obtain a distance for CTB 109 of 4+/-0.8 kpc. The new distance stillleads to a normal explosion energy for CTB 109/AXP 1E 2259+586.

The Distance of 4 kpc to the SNR CTB 109/AXP 1E 2259+586 system