The Proper Motion of the Central Compact Object RX J0822-4300 in the Supernova Remnant Puppis A, Revisited

Abstract

We present an improved proper motion measurement of the central compact object RX J0822-4300, located in the supernova remnant Puppis A. By employing a new data set taken in February 2019 by the High Resolution Camera aboard the Chandra X-ray Observatory, we approximately double the available temporal baseline for our analysis to slightly more than 19 years (7000 days). We correct for the astrometric inaccuracy of Chandra using calibrator stars with known optical positions that are detected in all observations. Thereby, we obtain absolute positions of RX J0822-4300 accurate to around $0.1^{\prime \prime }$ and from these a new best estimate for its total proper motion of ${\mu }_{\mathrm{tot}}=(80.4\pm 7.7){\mathrm{mas}\mathrm{yr}}^{-1}$. For a remnant distance of 2 kpc, this corresponds to a projected kick velocity of $(763\pm 73){\mathrm{km}\mathrm{s}}^{-1}$ at a position angle of ${\varphi }_0=(247.8\pm 4.4{)}^{\circ }$. The proper motion measurement of RX J0822-4300 is used for discussing the kinematic age of Puppis A.

15 pages, 7 figures, Accepted for publication in ApJ

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• A kinematic study of central compact objects and their host supernova remnants
• A detailed look at the thermal and non-thermal X-ray emission from the Vela supernova remnant with SRG/eROSITA
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• SRG/eROSITA and XMM-Newton observations of Vela Jr
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• Measuring the Non-Axially-Symmetric Surface Temperature Distribution of the Central Compact Object in Puppis A
• Updated Proper Motion of the Neutron Star in the Supernova Remnant Cassiopeia A
• Searching for Surviving Companion in the Young SMC Supernova Remnant 1E 0102.2-7219
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