Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-01-21
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
15 pages, Accepted for publication in ApJ Letters
Scientific paper
We revisit the apparent correlation between soft X-ray band photon index and spin-down rate nudot previously reported for Anomalous X-ray Pulsars (AXPs) and Soft Gamma Repeaters (SGRs) by Marsden & White (2001). Our analysis, improved thanks to new source discoveries, better spectral parameter measurements in previously known sources, and the requirement of source quiescence for parameter inclusion, shows evidence for the previously noted trend, although with greater scatter. This trend supports the twisted magnetosphere model of magnetars although the scatter suggests that factors other than nudot are also important. We also note possible correlations involving the spectra of AXPs and SGRs in the hard X-ray band. Specifically, the hard-band photon index shows a possible correlation with inferred nudot and B, as does the degree of spectral turnover. If the former trend is correct, then the hard-band photon index for AXP 1E 1048.1-5937 should be ~0--1. This may be testable with long integrations by INTEGRAL, or by the upcoming focussing hard X-ray mission NuSTAR.
Boydstun Kristen
Kaspi Victoria M.
No associations
LandOfFree
On the X-ray Spectra of Anomalous X-ray Pulsars and Soft Gamma Repeaters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the X-ray Spectra of Anomalous X-ray Pulsars and Soft Gamma Repeaters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the X-ray Spectra of Anomalous X-ray Pulsars and Soft Gamma Repeaters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-249496