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We present Chandra X-ray observations of galaxy cluster A168 (z=0.045). TwoX-ray peaks with a projected distance of 676 kpc are found to be located closeto two dominant galaxies, respectively. Both peaks are significantly offsetfrom the peak of the number density distribution of galaxies. This suggeststhat A168 consists of two subclusters, a northern subcluster (A168N) and asouthern subcluster (A168S). Further X-ray imaging analysis reveals that (1)the X-ray isophotes surrounding the two X-ray peaks are heavily distorted, (2)an elongated and ontinuous filament connects the two X-ray peaks. These suggestthat strong interactions have occurred between the two subclusters. Spectralanalysis shows that A168 has a mean temperature of 2.53 +/- 0.09 keV and a meanmetallicity of 0.31 +/- 0.04 Z_{solar}. The metallicity is roughly a constantacross the cluster but the temperature shows some systematic variations. MostX-ray, optical and radio properties of A168 are consistent with it being anoff-axis merger several Gyrs after a core passage, although detailed numericalsimulations are required to see whether the observed properties, in particularthe significant offset between the optical and X-ray centers, can be reproducedin such a scenario.Comment: 17 pages, 7 figures, to be published in ApJ. When this paper was  being refereed, Eric Hallman and Maxim Markevitch carried out a similar work  (astro-ph/0406322); our results are in broad agreemen

ChandraX‐Ray Observations of Galaxy Cluster A168