3XMM J185246.6+003317: another low magnetic field magnetar

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Title: 3XMM J185246.6+003317: another low magnetic field magnetar
Authors: Rea, Nanda | Viganò, Daniele | Israel, Gian Luca | Pons, José A. | Torres, Diego F.
Research Group/s: Astrofísica Relativista
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Pulsars: general | X-rays: stars
Knowledge Area: Astronomía y Astrofísica
Issue Date: 6-Jan-2014
Publisher: IOP Publishing
Citation: The Astrophysical Journal Letters. 2014, 781: L17. doi:10.1088/2041-8205/781/1/L17
Abstract: We study the outburst of the newly discovered X-ray transient 3XMMJ185246.6+003317, re-analyzing 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 seven months of outburst decay spanned by the observations. This translates to a 3σ upper limit for the period derivative of ˙ P <1.4×10−13 s s−1, which, assuming the classical magneto-dipolar braking model, gives a limit on the dipolar magnetic field of Bdip < 4.1×1013 G. The X-ray outburst and spectral characteristics of 3XMM J185246.6+003317 confirm its identification as a magnetar, but the magnetic field upper limit we derive defines it as the third “low-B” magnetar discovered in the past 3 yr, after SGR 0418+5729 and Swift J1822.3−1606. We have also obtained an upper limit to the quiescent luminosity (<4×1033 erg s−1), 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.
Sponsor: N.R. is supported by a Ramón y Cajal fellowship and by an NWO Vidi award. N.R., D.V., and D.F.T. acknowledge support from grants AYA2012-39303, SGR 2009-811, and iLINK 2011-0303. J.A.P. acknowledges support from the grants AYA 2010-21097-C03-02 and Prometeo/2009/103.
URI: http://hdl.handle.net/10045/34971
ISSN: 2041-8205 (Print) | 2041-8213 (Online)
DOI: 10.1088/2041-8205/781/1/L17
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014. The American Astronomical Society
Peer Review: si
Publisher version: http://dx.doi.org/10.1088/2041-8205/781/1/L17
Appears in Collections:INV - Astrofísica Relativista - Artículos de Revistas

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