Possible vacuum signature in the spectra of X-ray pulsars

Details Possible vacuum signature in the spectra of X-ray pulsars Possible vacuum signature in the spectra of X-ray pulsars

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l.125v&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Nov. 1, 1979, p. L125-L128.

Astronomy and Astrophysics

Astrophysics

44

Astronomical Spectroscopy, Pulsars, Vacuum Spectroscopy, X Ray Sources, Atmospheric Models, Plasma Spectra, Polarization Characteristics, Radiative Transfer

Scientific paper

The vacuum polarization effect expected in the strong magnetic fields of pulsars should dominate the behavior of the opacities and the radiative transfer at X-ray frequencies. A sharp feature in the cross sections, which is peculiar to vacuum effects, is present at a particular frequency. In a radiative-transfer calculation for a simplified model atmosphere, these cross sections give rise to a line feature at this frequency, in addition to the cyclotron feature. This should serve as a diagnostic for the presence of vacuum effects, as well as for the determination of the plasma density. A change in the plane of polarization is also predicted at the frequency of the sharp feature.

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