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We use mid-infrared 3.6 and 4.5microns imaging of NGC 3906 from the SpitzerSurvey of Stellar Structure in Galaxies (S4G) to understand the nature of anunusual offset between its stellar bar and the photometric center of anotherwise regular, circular outer stellar disk. We measure an offset of ~720 pcbetween the center of the stellar bar and photometric center of the stellardisk; the bar center coincides with the kinematic center of the disk determinedfrom previous HI observations. Although the undisturbed shape of the disksuggests that NGC 3906 has not undergone a significant merger event in itsrecent history, the most plausible explanation for the observed offset is aninteraction. Given the relatively isolated nature of NGC 3906 this interactioncould be with dark matter sub structure in the galaxy's halo or from a recentinteraction with a fast moving neighbor which remains to be identified.Simulations aimed at reproducing the observed offset between the stellar bar /kinematic center of the system and the photometric center of the disk arenecessary to confirm this hypothesis and constrain the interaction history ofthe galaxy.

The Odd Offset between the Galactic Disk and Its Bar in NGC 3906