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Abstract: We propose an ACIS observation of PSR J2021+3651 for measuring its proper motion. Previous studies assumed that the pulsar is moving from the location of its associated TeV source, which is believed to be the pulsar?s birth site. The inferred pulsar moving velocity based on this agrees with the observed bow-shock structures caused by a supersonically moving pulsar. However, the undisturbed torus and the jets of the pulsar wind nebula suggest a mildly moving pulsar, which contradicts with the fast-moving assumption. Only a direct measurement of the pulsar?s velocity can confirm this. By adopting ?Figure of Merit? method, it will become feasible for measuring proper motion of PSR J2021+3651 between the archival data and a new cycle 24 Chandra observation. 1 |
Remarks: In order to include as many common reference stars as possible, the new observation would better avoid the roll angle between 40-150 degrees. Our most preferred roll angle is 330 degrees, just the same as the archival data to achieve the best measurements but NOT strictly necessary. Even with a random roll angle, we can still have at least three reference sources for astrometry correction. |
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