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Energy-dependent ~100 μs Time Lags as Observational Evidence of Comptonization Effects in the Neutron Star Plasma Environment

M. Falanga 1 L. Titarchuk
1 APC - AHE - APC - Astrophysique des Hautes Energies
Dipartimento di Astronomia, Universita degli Studi di Bologna, APC (UMR_7164) - AstroParticule et Cosmologie
Abstract : We present a Comptonization model for the observed properties of the energy-dependent soft/hard time lags and pulsed fraction (amplitude) associated with the pulsed emission of a neutron star (NS). We account for the soft lags by downscattering of hard X-ray photons in the relatively cold plasma of the disk or NS surface. A fraction of the soft X-ray photons coming from the disk or NS surface upscatter off hot electrons in the accretion column. This effect leads to hard lags as a result of thermal Comptonization of the soft photons. (abridged)
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Submitted on : Wednesday, March 21, 2007 - 4:01:00 PM
Last modification on : Saturday, September 19, 2020 - 4:53:15 AM

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M. Falanga, L. Titarchuk. Energy-dependent ~100 μs Time Lags as Observational Evidence of Comptonization Effects in the Neutron Star Plasma Environment. The Astrophysical Journal, American Astronomical Society, 2007, 661, pp.1084-1088. ⟨10.1086/514805⟩. ⟨in2p3-00137724⟩

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