NDLI: The formation of X-ray radiation in a boundary layer during disk accretion onto a neutron star

Content Provider	Springer Nature Link
Author	Grebenev, S. A. Sunyaev, R. A.
Copyright Year	2002
Abstract	We present computed radiation spectra for the boundary layer (BL) of the accretion disk that is formed near the surface of a neutron star. Both free-free processes and Comptonization were taken into account. Our computations are based on the hydrodynamic solution obtained by Popham and Sunyaev (2001) for the BL structure. The computed spectra are highly diluted compared to the Planck spectra of the same surface temperature. They are complex in shape; in particular, an intense Wien emission component is formed in their high-energy region at high accretion rates. In general, the computed spectra are harder than those observed in actual X-ray sources. This is the result of a very high temperature found by Popham and Sunyaev (2001) for the BL. We show that such temperatures could result from an oversimplified treatment of radiative transfer in their paper, which completely ignored the frequency dependence of the matter opacity and radiation intensity. Our computations indicate that at moderate accretion rates, a proper treatment of radiative transfer with allowance for Comptonization leads to appreciably lower plasma temperatures and to softer radiation spectra.
Starting Page	150
Ending Page	162
Page Count	13
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	28
Issue Number	3
e-ISSN	15626873
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2002-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	accretion boundary layer Comptonization neutron stars X-ray sources Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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