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3XMM J185246.6+003317: another low magnetic field magnetar
Astrophysics of Galaxies · Submitted 13 Nov 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The X-ray outburst and spectral characteristics of 3XMM J185246.6+003317 confirms the identification as a magnetar, but the magnetic field upper limit we derive defines it as the third "low-B" magnetar discovered in the past three years, after SGR 0418+5729 and Swift J1822.3-1606.
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The abstract, sentence by sentence
We study the outburst of the newly discovered X-ray transient 3XMM J185246.6+003317, re-analysing all available XMM-Newton, observations of the source to perform a phase-coherent timing analysis, and derive updated values of the period and period derivative. We find the source rotating at P=11.55871346(6) s (90% confidence level; at epoch MJD 54728.7) but no evidence for a period derivative in the 7 months of outburst decay spanned by the observations. This translates in a 3sigma upper limit for the period derivative of Pdot<1.4x10^{-13} s/s, which, assuming the classical magneto-dipolar braking model, gives a limit on the dipolar magnetic field of B_dip<4.1x10^{13} G . The X-ray outburst and spectral characteristics of 3XMM J185246.6+003317 confirms the identification as a magnetar, but the magnetic field upper limit we derive defines it as the third "low-B" magnetar discovered in the past three years, after SGR 0418+5729 and Swift J1822.3-1606. We have also obtained an upper limit to the quiescent luminosity (< 4x10^{33} erg/s), in line with the expectations for an old magnetar. The discovery of this new low field magnetar reaffirms the prediction of about one outburst per year from the hidden population of aged magnetars.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We study the outburst of the newly discovered X-ray transient 3XMM J185246.6+003317, re-analysing all available XMM-Newton, observations of the source to perform a phase-coherent timing analysis, and derive updated values of the period and period derivative. | contribution 0.85 | 0.96 | 0.04 | asserted 0.89 |
| s1 | We find the source rotating at P=11.55871346(6) s (90% confidence level; at epoch MJD 54728.7) but no evidence for a period derivative in the 7 months of outburst decay spanned by the observations. | result 1.00 | 0.97 | 0.15 | asserted 1.00 |
| s2 | This translates in a 3sigma upper limit for the period derivative of Pdot<1.4x10^{-13} s/s, which, assuming the classical magneto-dipolar braking model, gives a limit on the dipolar magnetic field of B_dip<4.1x10^{13} G . | result 0.87 | 0.94 | 0.22 | asserted 0.95 |
| s3 | The X-ray outburst and spectral characteristics of 3XMM J185246.6+003317 confirms the identification as a magnetar, but the magnetic field upper limit we derive defines it as the third "low-B" magnetar discovered in the past three years, after SGR 0418+5729 and Swift J1822.3-1606. | interpretation 0.91 | 0.87 | 0.77 | asserted 1.00 |
| s4 | We have also obtained an upper limit to the quiescent luminosity (< 4x10^{33} erg/s), in line with the expectations for an old magnetar. | result 0.99 | 0.94 | 0.06 | asserted 0.69 |
| s5 | The discovery of this new low field magnetar reaffirms the prediction of about one outburst per year from the hidden population of aged magnetars. | interpretation 1.00 | 0.26 | 0.29 | asserted 0.99 |
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Original abstract
We study the outburst of the newly discovered X-ray transient 3XMM J185246.6+003317, re-analysing all available XMM-Newton, observations of the source to perform a phase-coherent timing analysis, and derive updated values of the period and period derivative. We find the source rotating at P=11.55871346(6) s (90% confidence level; at epoch MJD 54728.7) but no evidence for a period derivative in the 7 months of outburst decay spanned by the observations. This translates in a 3sigma upper limit for the period derivative of Pdot<1.4x10^{-13} s/s, which, assuming the classical magneto-dipolar braking model, gives a limit on the dipolar magnetic field of B_dip<4.1x10^{13} G . The X-ray outburst and spectral characteristics of 3XMM J185246.6+003317 confirms the identification as a magnetar, but the magnetic field upper limit we derive defines it as the third "low-B" magnetar discovered in the past three years, after SGR 0418+5729 and Swift J1822.3-1606. We have also obtained an upper limit to the quiescent luminosity (< 4x10^{33} erg/s), in line with the expectations for an old magnetar. The discovery of this new low field magnetar reaffirms the prediction of about one outburst per year from the hidden population of aged magnetars.
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