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Probing the Proper Motion of the Central Compact Object in Puppis-A

For further information, please contact: dhui@mpe.mpg.de ABSTRACT: Using two observations taken with the High Resolution Camera (HRC-I) aboard the Chandra X-ray satellite, we have examined the central compact object RX J0822-4300 for a possible proper motion. The position of RX J0822-4300 is found to be different by 0.574±0.184 arcsec, implying a proper motion of 107.49±34.46 mas/yr with a position angle of 241±24 degree. For a distance of 2.2 kpc, this proper motion is equivalent to a recoil velocity of 1121.79±359.60 km/s. Both the magnitude and the direction of the proper motion are in agreement with the birth place of RX J0822-4300 being near to the optical expansion center of the supernova remnant. Although this is a promissing indication of a fast moving compact object in a supernova remnant, the relative large error prevents any constraining conclusion.