X-ray observations of RX J0822-4300 and Puppis-A

Abstract

Based on observations with the X-ray observatories Chandra and XMM-Newton we present results from a detailed spectro-imaging and timing analysis of the central compact X-ray source RX J0822-4300 in the supernova remnant Puppis-A. The superior angular resolution of Chandra allows for the first time to pinpoint the point source nature of this object down to $0.59\pm 0.01$ arcsec (FWHM) and to determine its position:{RA=$08^{\mathrm{h}}21^{\mathrm{m}}57.40^{\mathrm{s}}$, Dec=$-43^{\circ }00^{{}^{\prime }}16.69^{{}^{\prime \prime }}$ (J2000)} with sub-arcsecond accuracy. Spectral fits based on Chandra and XMM-Newton data provide a tight constraint on the emission properties of RX J0822-4300. Most of its X-ray emission seems to be of thermal origin. A model spectrum consisting of two blackbody components with $T_1\simeq 2.6\times 10^6$ K, $T_2\simeq 5.0\times 10^6$ K and $R_1\simeq 3.3$ km, $R_2\simeq 0.75$ km for the blackbody temperatures and the size of the projected emitting regions, respectively, provides the best model description of its spectrum. A search for X-ray pulsations from RX J0822-4300, revealed an interesting periodicity candidate which, if confirmed, does not support a scenario of steady spin-down.

arXiv commentAccepted by A&A, 20 pages, 10 figures, 3 tables

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