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2020ApJ...894...52X - Astrophys. J., 894, 52-52 (2020/May-1)

Magnetar as central engine of gamma-ray bursts: quasi-universal jet, event rate, and X-ray luminosity function of dipole radiations.

XIE W.-J., ZOU L., LIU H.-B., WANG S.-Q. and LIANG E.-W.

Abstract (from CDS):

Early shallow-decaying X-ray afterglows of gamma-ray bursts (GRBs) may be attributed to the dipole radiations of newly born magnetars. Assuming that the GRB jets powered by magnetars are quasi-universal, we find that the jet structure can be parameterized as a uniform jet with a luminosity of logLj/erg s–1=52.68–0.33+0.76 (1σ) and an opening angle θj=2.10–1.28+1.90 (50% confidence level), surrounding by a power-law decay component with an index of -4.00–0.37+0.27 (1σ). The inferred local GRB rate is ρ = 9.6 Gpc–3 yr–1 by including both the typical GRBs and LL-GRBs as the same population. The typical viewing angle is 3.3°, and may be 20° ∼ 30° for LL-GRBs. The X-ray luminosity function of the dipole radiation wind can be empirically described by a broken power-law function with indices β1=0.78–0.15+0.16 and β2> 1.6 broken at logLb,w/erg s–1=48.51–0.65+0.53. In the case where the wind outflow is collimated and coaxial with the GRB jet, we find that the wind structure is similar to the GRB jet, i.e., logLc,w/ergs–1=48.38–0.48+0.30, θc,w=2.65o_-1.19o+1.73o^, and kw=4.57–0.75+1.21. The observed correlation between the prompt gamma-ray luminosity and X-ray luminosity of the wind may result from the viewing angle effect in such a jet-wind system. A discussion on surveys using the X-ray instruments on board the Einstein Probe mission in the soft X-ray band for the jet and wind emission is also presented.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Gamma-ray bursts - Magnetars - Relativistic jets - Luminosity function

Simbad objects: 68

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