NDLI: On the mechanism of X-ray emission from radio pulsars

Content Provider	Springer Nature Link
Author	Malov, I. F.
Copyright Year	2003
Abstract	We discuss the correlations between the luminosities of radio pulsars in various frequency ranges and the magnetic fields on the light cylinder. These correlations suggest that the observed emission is generated in outer layers of the pulsar magnetospheres by the synchrotron mechanism. To calculate the distribution functions of the relativistic particles in the generation region, we use a model of quasilinear interactions between the waves excited by cyclotron instability and particles of the primary beam and the secondary electron—positron plasma. We derive a formula for calculating the X-ray luminosity L $_{ x }$ of radio pulsars. A strong correlation was found between L $_{ x }$ and the parameter $$\dot P_{ - 15} /P^{3.5}$$ , where P is the neutron-star rotation period, in close agreement with this formula. The latter makes it possible to predict the detection of X-ray emission from more than a hundred (114) known radio pulsars. We show that the Lorentz factors of the secondary particles are small (γ$_{ p }$ = 1.5–8.5), implying that the magnetic field near the neutron-star surface in these objects is multipolar. It follows from our model that almost all of the millisecond pulsars must emit X-ray synchrotron radiation. This conclusion differs from predictions of other models and can be used to test the theory under consideration. The list of potential X-ray radiators presented here can be used to search for X-ray sources with existing instruments.
Starting Page	502
Ending Page	509
Page Count	8
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	29
Issue Number	8
e-ISSN	15626873
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2003-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	pulsars neutron stars black holes X-ray sources Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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