Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-03-28
Astronomy and Astrophysics
Astrophysics
6 pages with 2 figures, LaTex, emulateapj.sty. To appear in the Astrophysical Journal Letters
Scientific paper
10.1086/312656
We present new results on the recently discovered 69 ms X-ray pulsar AXS J161730-505505, the sixth youngest sample of all known pulsars. We have undertaken a comprehensive X-ray observing campaign of AXS J161730-505505 with the ASCA, SAX, and XTE observatories and follow its long term spin-down history between 1989 and 1999, using these, archival GINGA and ASCA data sets, and the radio ephemeris. The spin-down is not simply described by a linear function as originally thought, but instead we find evidence of a giant glitch (|Delta P/P| > 10E-6) between 1993 August and 1997 September, perhaps the largest yet observed from a young pulsar. The glitch is well described by steps in the period and its first derivative accompanied by a persistent second derivative similar to those in the Vela pulsar. The pulse profile of AXS J161730-505505 presents a single asymmetric peak which is maintained over all observation epochs. The energy spectrum is also steady over time, characterized by a highly absorbed power-law with a photon index 1.4 +/- 0.2, consistent with that found for other young rotation powered pulsars.
Dotani Tadayasu
Gotthelf Eric Van
Kinugasa Kenzo
Torii Kazufumi
Vasisht Gautam
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