EDP Sciences
Free Access
Volume 457, Number 3, October III 2006
Page(s) L33 - L36
Section Letters
DOI https://doi.org/10.1051/0004-6361:20065941

A&A 457, L33-L36 (2006)
DOI: 10.1051/0004-6361:20065941


Probing the proper motion of the central compact object in Puppis-A with the Chandra high resolution camera

C. Y. Hui and W. Becker

Max-Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, 85741 Garching bei München, Germany
    e-mail: dhui@mpe.mpg.de

(Received 30 June 2006 / Accepted 8 August 2006 )

By making use of the sub-arcsecond angular resolution of the High Resolution Camera (HRC-I) aboard the Chandra X-ray satellite we have examined the central compact object RX J0822-4300 in the supernova remnant Puppis-A for a possible proper motion. Using data which span an epoch of 1952 days we found the position of RX J0822-4300 different by 0.574 $\pm$ 0.184 arcsec, implying a proper motion of $\mu=107.49$ $\pm$ 34.46 mas/yr. For a distance of 2.2 kpc, this proper motion is equivalent to a recoil velocity of 1121.79 $\pm$ 359.60 km s-1. The position angle is found to be $241^\circ$ $\pm$ $24^\circ$. Since both the magnitude and 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, the result presented in this letter is a promising indication of a fast moving compact object in a supernova remnant. Although the positional shift inferred from the current data is significant at a ~$3\sigma$ level only, one or more future HRC-I observations can obtain a much larger positional separation and further constrain the measurement.

Key words: pulsars: individual: RX J0822-4300

© ESO 2006