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Confirmation of the presence of a CRSF in the NICER spectrum of X 1822-371 by Iaria, R.; Di Salvo, T.; Anitra, A.; Miceli, C.; Barra, F.; Leone, W.; Burderi, L.; Sanna, A.; Riggio, A. is a scholarly article available to read on EtoBox.

What is Confirmation of the presence of a CRSF in the NICER spectrum of X 1822-371 about?

X 1822-371 is an eclipsing binary system with a period close to 5.57 hr and an orbital period derivative $\dot{P}_{\rm orb}$ of 1.42(3)$\times 10^{-10}$ s s$^{-1}$. The extremely high value of its $\dot{P}_{\rm orb}$ is compatible with a super-Eddington mass transfer rate from the companion star and, consequently, an intrinsic luminosity at the Eddington limit. The source is also an X-ray pulsar, it shows a spin frequency of 1.69 Hz and is in a spin-up phase with a spin frequency derivative of $7.4 \times 10^{-12}$ Hz s$^{-1}$. Assuming a luminosity at the Eddington limit, a neutron star magnetic field strength of $B = 8 \times 10^{10}$ G is estimated. However, a direct measure of $B$ could be obtained observing a CRSF in the energy spectrum. Analysis of \textit{XMM-Newton} data suggested the presence of a cyclotron line at 0.73 keV, with an estimated magnetic field strength of $B=(8.8 \pm 0.3) \times 10^{10}$ G. Here we analyze the 0.3-50 keV broadband spectrum of X 1822-371 combining a 0.3-10 keV NICER spectrum and a 4.5-50 keV \textit{NuSTAR} spectrum to investigate the presence of a cyclotron absorption line and the complex continuum emission spectrum. The NICER spectrum confir

Author

Iaria, R.; Di Salvo, T.; Anitra, A.; Miceli, C.; Barra, F.; Leone, W.; Burderi, L.; Sanna, A.; Riggio, A.

Published

2024

Language

EN