2003A&A...398..639Z


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.08CET13:55:16

2003A&A...398..639Z - Astronomy and Astrophysics, volume 398, 639-646 (2003/2-1)

X-ray and gamma-ray emission from millisecond pulsars.

ZHANG L. and CHENG K.S.

Abstract (from CDS):

We present a self-consistent model to describe X-ray and γ-ray emission from millisecond pulsars (MSPs). The X-rays of MSPs are produced by the backflow of primary charged particles from the outer gap and most likely consist of three components, two thermal components and one power law component if there is a strong multipole magnetic field on the stellar surface. The backflow of ultra-relativistic particles emits photons with energies about several tens of GeV via curvature radiation. These photons cause an electromagnetic cascade about 2-3 stellar radii above the polar cap. The synchrotron radiation of these cascade e± pairs produces hard X-rays with a power law index ∼1.5. Near 105cm above the stellar surface, the primary charged particles encounter the strong surface magnetic field, which alters the local radius of curvature greatly, and they quickly loose more than half of their remaining energies to curvature radiation. These curvature photons heat up the polar cap area with a radius ∼ 105cm, which produce the softer thermal X-ray component. Finally, the primary charged particles deposit their remaining energies in a much smaller polar cap area, which corresponds to the footprints of outer gap and produce the medium hard X-ray component. γ-rays are produced in the outer gap through synchro-curvature radiation. We have applied this model to the MSPs which emit pulsed X-rays and likely γ-rays such as PSR J0437-4715, PSR J2124-3358, PSR J0218+4232 and PSR B1821-24. Our results give an agreement between predicted spectrum and the observed spectrum of MSP emission.

Abstract Copyright:

Journal keyword(s): gamma rays: theory - stars: pulsars: general

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 290 2
2 3C 66A BLL 02 22 39.6111630878 +43 02 07.797284539   15.71 15.21 14.5   ~ 773 1
3 PSR J0437-47 Psr 04 37 15.7976203608 -47 15 08.536908257           DC 722 0
4 PSR J0751+1807 Psr 07 51 09.1539 +18 07 38.335           ~ 244 1
5 PSR J1012+5307 Psr 10 12 33.4341531837 +53 07 02.564526788     19.5     DA 308 1
6 PSR J1024-0719 Psr 10 24 38.697 -07 19 19.07           ~ 176 0
7 PSR J1744-1134 Psr 17 44 29.4103 -11 34 54.727           ~ 198 1
8 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 422 2
9 PSR J1959+2048 Psr 19 59 36.7480 +20 48 14.599   20.4       ~ 683 2
10 PSR J2124-3358 Psr 21 24 43.8464 -33 58 44.961           ~ 235 1

    Equat.    Gal    SGal    Ecl

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2019.12.08-13:55:16

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