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A scenario of the formation of isolated X-ray pulsars with anomalously long period

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Abstract

A scenario of the formation of isolated X-ray pulsars is discussed with an application to one of the best studied objects of this class 1E 161348-5055. This moderately luminous, 1033–1035 erg s−1, pulsar with a relatively soft spectrum, kT ∼ 0.6–0.8 keV, is associated with an isolated neutron star, which is located near the center of the young (∼2000 yr) compact supernova remnant RCW 103 and rotates steadily (\(\left| {\dot \nu } \right| \leqslant 2.6 \times 10^{ - 18}\) Hz s−1) with the period of 6.7 h. We show that in the current epoch the neutron star is in the accretor state. The parameters of the source emission can be explained in terms of the magnetic-levitation accretion scenario in which the star with the surface magnetic field of 1012 G accretes material onto its surface from a non-Keplerian magnetic fossil disk at the rate 1014 g s−1. A neutron star could evolve to this state in a High-Mass X-ray Binary (HMXB), which had disintegrated during the supernova explosion powered by the core-collapse of its massive component. The life-time of an isolated X-ray pulsar formed this way can be as long as a few thousand years.

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Authors and Affiliations

  1. Pulkovo Central Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65-1, St. Petersburg, 196140, Russia

    N. R. Ikhsanov, V. Yu. Kim & N. G. Beskrovnaya

  2. Saint Petersburg State University, Universitetsky pr., 28, Stary Peterhof, St. Petersburg, 198504, Russia

    N. R. Ikhsanov

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  1. N. R. Ikhsanov
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  2. V. Yu. Kim
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  3. N. G. Beskrovnaya
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Correspondence to N. R. Ikhsanov.

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Original Russian Text © N.R. Ikhsanov, V.Yu. Kim, N.G. Beskrovnaya, 2015, published in Astronomicheskii Zhurnal, 2015, Vol. 92, No. 1, pp. 29–37.

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Ikhsanov, N.R., Kim, V.Y. & Beskrovnaya, N.G. A scenario of the formation of isolated X-ray pulsars with anomalously long period. Astron. Rep. 59, 25–32 (2015). https://doi.org/10.1134/S1063772915010059

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