A potential cyclotron line signature in low luminosity x‐ray pulsars
作者:
Robert W. Nelson,
John C. L. Wang,
E. E. Salpeter,
Ira Wasserman,
期刊:
AIP Conference Proceedings
(AIP Available online 1994)
卷期:
Volume 308,
issue 1
页码: 592-596
ISSN:0094-243X
年代: 1994
DOI:10.1063/1.45944
出版商: AIP
数据来源: AIP
摘要:
Simple estimates indicate there should be ≳103low luminosity x‐ray pulsars (L≳1034erg s−1) in the Galaxy undergoing ‘‘low‐state’’ wind accretion in Be/x‐ray binary systems, and ∼108–109isolated neutron stars which may be accreting directly from the interstellar medium. Despite their low effective temperatures (kTe≲300 eV), we predict the low luminosity accreting neutron stars with magnetic fieldsB∼(0.7−7)×1012G should emit a substantial fraction (0.5–5%) of their total luminosity in a narrow (E/&Dgr;E∼2–4) cyclotron emission line which peaks in the energy range ∼5–20 keV. In sharp contrast to the underlying thermal emission, thisnonthermalcyclotron component will not be strongly absorbed by the intervening H igas, and consequently it may be the only observable signature for the bulk of these low luminosity sources. We propose a search for this cyclotron emission feature in long pointed observations by ASCA of the Be/x‐ray transient pulsars V0331+53 and 4U0115+63 in their quiescent ‘‘low state’’. ©1994 American Institute of Physics.
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