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SCIENTIA SINICA Physica, Mechanica & Astronomica, Volume 48, Issue 3: 039510(2018) https://doi.org/10.1360/SSPMA2017-00252

Detecting magnetars with Einstein Probe

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  • ReceivedSep 17, 2017
  • AcceptedOct 9, 2017
  • PublishedDec 28, 2017
PACS numbers

Abstract

Magnetars are active X-ray and soft gamma-ray sources in the sky, and are believed to be young neutron stars powered by their ultra-high surface magnetic fields. With the all-sky monitoring capability of the Einstein Probe (EP), we expect to be able to find 3 new magnetars through their X-ray outburst activity, and will also be able to study the X-ray activities of more than 20 currently known magnetars. The EP’s observations will thus help estimate the total number of magnetars in the Milky Way and understand their formation channels in stellar evolution and supernova explosions. In addition, multi-wavelength observations can be conducted once a magnetar is found to be in the active state with EP. The studies will help understand the magnetars’ overall emission properties and the underlying physical processes. Although it is rare, magnetar-like activity was also seen in other classes of young neutron stars. EP will be able to monitor those neutron stars, for finding more such events and thus help determine if any intrinsic property between magnetars and other neutron stars could play a key role in inducing such activity.


Funded by

中国科学院战略性先导科技专项(XDA15052100)


Acknowledgment

我们感谢南京大学周平和陈阳同意我们使用图1, 也感谢加拿大麦吉尔大学Kaspi V M同意我们使用图2.


References

[1] Woods P M, Thompson C. Soft gamma repeaters and anomalous X-ray pulsars: Magnetar candidates. In: Lewin W, van der Klis M, eds. Compact Stellar X-ray Sources. Cambridge Astrophysics Series, No. 39. Cambridge, UK: Cambridge University Press, 2006. 547–586. Google Scholar

[2] Olausen S A, Kaspi V M. The McGill magnetar catalog. Astrophys J Suppl Ser, 2014, 212: 6 CrossRef ADS arXiv Google Scholar

[3] Zhou P, Chen Y, Li X D, et al. Discovery of the transient magnetar 3XMM J185246.6+003317 near supernova remnant kesteven 79 with XMM-Newton. Astrophys J, 2014, 781: L16 CrossRef ADS arXiv Google Scholar

[4] Tam C R, Kaspi V M, van Kerkwijk M H, et al. Correlated infrared and X-ray flux changes following the 2002 June outburst of the anomalous X-ray pulsar 1E 2259+586. Astrophys J, 2004, 617: L53-L56 CrossRef ADS Google Scholar

[5] Camilo F, Ransom S M, Penalver J, et al. The variable radio–to–X-Ray spectrum of the magnetar XTE J1810−197. Astrophys J, 2007, 669: 561-569 CrossRef ADS arXiv Google Scholar

[6] Thompson C. Electrodynamics of magnetars. IV. Self-consistent model of the inner accelerator with implications for pulsed radio emission. Astrophys J, 2008, 688: 499-526 CrossRef ADS arXiv Google Scholar

[7] Beloborodov A M. Electron-positron flows around magnetars. Astrophys J, 2013, 777: 114 CrossRef ADS arXiv Google Scholar

[8] Xu R X, Tao D J, Yang Y. The superflares of soft-ray repeaters: Giant quakes in solid quark stars?. Mon Not R Astron Soc-Lett, 2006, 373: L85-L89 CrossRef ADS Google Scholar

[9] Xu R X. Compressed baryonic matter: from nuclei to pulsars (in Chinese). Sci Sin-Phys Mech Astron, 2013, 43: 1288–1298 [徐仁新. 压缩重子物质: 从原子核到脉冲星. 中国科学: 物理 力学 天文, 2013, 43: 1288–1298]. Google Scholar

[10] Malheiro M, Rueda J A, Ruffini R. SGRs and AXPs as rotation-powered massive white dwarfs. Publ Astron Soc Jpn, 2012, 64: 56 CrossRef ADS arXiv Google Scholar

[11] Yuan W M, Osborne J P, Zhang C, et al. Exploring the dynamic X-ray universe: Scientific opportunities for the Einstein Probe Mission. Chin J Space Sci, 2016, 36: 117–138. Google Scholar

[12] Faucher-Giguère C A, Kaspi K M. Birth and evolution of isolated radio pulsars. Astrophys J, 2006, 643: 332-355 CrossRef Google Scholar

[13] Gullón M, Pons J A, Miralles J A, et al. Population synthesis of isolated neutron stars with magneto-rotational evolution—II. From radio-pulsars to magnetars. Mon Not R Astron Soc, 2015, 454: 615-625 CrossRef Google Scholar

[14] Muno M P, Clark J S, Crowther P A, et al. A neutron star with a massive progenitor in Westerlund 1. Astrophys J, 2006, 636: L41-L44 CrossRef ADS Google Scholar

[15] Woods P M, Kaspi V M, Thompson C, et al. Changes in the X-ray emission from the magnetar candidate 1E 2259+586 during its 2002 outburst. Astrophys J, 2004, 605: 378-399 CrossRef ADS Google Scholar

[16] Gavriil F P, Gonzalez M E, Gotthelf E V, et al. Magnetar-like emission from the Young pulsar in Kes 75. Science, 2008, 319: 1802-1805 CrossRef PubMed ADS arXiv Google Scholar

[17] Rea N, Borghese A, Esposito P, et al. Magnetar-like activity from the central compact object in the SNR RCW103. Astrophys J, 2016, 828: L13 CrossRef ADS arXiv Google Scholar

  • Figure 1

    (Color online) Discovery of a magnetar near the supernova remnant Kes 79 (adapted from ref. [3] by permission). The position of the magnetar is marked by the red circle: in 2007 March, the source’s emission was below the detection limit of X-ray observations, but in 2008 September, the source was visible.

  • Figure 2

    Number of discovered magnetars as a function of years (adapted from ref. [2] by permission). The dashed and dash-dotted lines mark the launch times of the Swift and Fermi satellite, respectively.

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