Analyzing X-ray pulsar profiles: geometry and beam pattern of EXO 2030+375
Sasaki M, Klochkov D, Kraus U, Caballero I, Santangelo A (2010)
Publication Status: Published
Publication Type: Journal article
Publication year: 2010
Journal
Publisher: EDP SCIENCES S A
Book Volume: 517
DOI: 10.1051/0004-6361/200913863
Abstract
Context. The pulse profiles of the transient Be/X-ray binary EXO
2030+375 show strong dependence on energy, as well as on its luminosity
state, and are asymmetric in shape.
Aims: We want to identify the
emission components of the two magnetic poles in the pulsed emission to
understand the geometry of the neutron star and its beam pattern.
Methods: We utilize a pulse-profile decomposition method that enables us
to find two symmetric pulse profiles from the magnetic poles of the
neutron star. The symmetry characteristics of these single-pole pulse
profiles give information about the position of the magnetic poles of
the neutron star relative to its rotation axis.
Results: We find a
possible geometry for the neutron star in EXO 2030+375 through the
decomposition of the pulse profiles, which suggests that one pole gets
closer to the line of sight than the other and that, during the
revolution of the neutron star, both poles disappear behind the horizon
for a short period of time. A considerable fraction of the emission
arises from a halo while the pole is facing the observer and from the
accretion stream of the other pole while it is behind the neutron star,
but the gravitational line bending makes the emission visible to us.
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How to cite
APA:
Sasaki, M., Klochkov, D., Kraus, U., Caballero, I., & Santangelo, A. (2010). Analyzing X-ray pulsar profiles: geometry and beam pattern of EXO 2030+375. Astronomy & Astrophysics, 517. https://doi.org/10.1051/0004-6361/200913863
MLA:
Sasaki, Manami, et al. "Analyzing X-ray pulsar profiles: geometry and beam pattern of EXO 2030+375." Astronomy & Astrophysics 517 (2010).
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