2002A&A...393..511D


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET12:01:13

2002A&A...393..511D - Astronomy and Astrophysics, volume 393, 511-521 (2002/10-2)

Rotation as a source of asymmetry in the double-peak lightcurves of the bright EGRET pulsars.

DYKS J. and RUDAK B.

Abstract (from CDS):

We investigate the role of rotational effects in inducing asymmetry present above ∼5GeV in the double-peak lightcurves of the bright EGRET pulsars: Vela, Crab, and Geminga. According to Thompson (2001, AIP Conf. Proc., 558, 103), the trailing peak dominates over the leading peak above ∼5GeV consistently for all three pulsars, even though this is not the case over the entire energy range of EGRET, i.e. above ∼100MeV. We present the results of Monte Carlo simulations of electromagnetic cascades in a pulsar magnetosphere within a single-polar-cap scenario with rotationally-induced propagation effects of the order of β (where β is the dimensionless local corotation velocity). We find that even in the case of nearly aligned rotators with spin periods of P∼0.1s rotation may lead to asymmetric (with respect to the magnetic axis) magnetic photon absorption which in turn leads to asymmetric gamma-ray pulse profiles. The resulting features - softer spectrum of the leading peak and the dominance of the trailing peak above ∼5GeV - agree qualitatively with the EGRET data of the bright gamma-ray pulsars.

Abstract Copyright:

Journal keyword(s): stars: rotation - stars: pulsars: general

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 299 2
2 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4840 1
3 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5673 4
4 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1099 0
5 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545           ~ 2082 1
6 PSR B1055-52 Psr 10 57 58.970 -52 26 56.52           ~ 683 0
7 PSR B1706-44 Psr 17 09 42.62 -44 29 05.8           ~ 580 1
8 PSR B1951+32 Psr 19 52 58.181 +32 52 40.98           ~ 551 2

    Equat.    Gal    SGal    Ecl

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2020.12.02-12:01:13

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