2013A&A...550A.101A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:10:02

2013A&A...550A.101A - Astronomy and Astrophysics, volume 550A, 101-101 (2013/2-1)

Pulsed high-energy γ-rays from thermal populations in the current sheets of pulsar winds.

ARKA I. and DUBUS G.

Abstract (from CDS):

More than one hundred pulsars have been detected up to now at GeV energies by the Large Area Telescope (LAT) on the Fermi gamma-ray observatory. Current modelling proposes that the high-energy emission comes from outer magnetospheric gaps, but radiation from the equatorial current sheet that separates the two magnetic hemispheres outside the light cylinder has also been investigated. We discuss the region outside the light cylinder, the ``near wind'' zone. We investigate the possibility that synchrotron radiation emitted by thermal populations in the equatorial current sheet of the pulsar wind in this region can explain the lightcurves and spectra observed by Fermi/LAT. We used analytical estimates as well as detailed numerical computation to calculate the γ-ray luminosities, lightcurves, and spectra of γ-ray pulsars. Many of the characteristics of the γ-ray pulsars observed by Fermi/LAT can be reproduced by our model, most notably the position of these objects in the P-{dot}(P) diagram, and the range of γ-ray luminosities. A testable result is a sub-exponential cutoff with an index b=0.35. We also predict the existence of a population of pulsars with cutoff energies in the MeV range. These have systematically lower spindown luminosities than the Fermi/LAT-detected pulsars. It is possible for relativistic populations of electrons and positrons in the current sheet of a pulsar's wind immediately outside the light cylinder to emit synchrotron radiation that peaks in the sub-GeV to GeV regime, with γ-ray efficiencies similar to those observed for the Fermi/LAT pulsars.

Abstract Copyright:

Journal keyword(s): pulsars: general - radiation mechanisms: non-thermal - stars: winds, outflows - gamma rays: stars - relativistic processes

Simbad objects: 12

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Number of rows : 12

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 SNR G130.7+03.1 SNR 02 05 37.0 +64 49 42           ~ 565 4
2 PSR J0205+6449 Psr 02 05 37.92 +64 49 42.8           ~ 210 1
3 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4803 1
4 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5594 4
5 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1092 0
6 PSR B1055-52 Psr 10 57 58.970 -52 26 56.52           ~ 680 0
7 CPD-63 2495 HXB 13 02 47.6541729595 -63 50 08.625922862 10.34 10.72 9.98 10.03   O9.5Ve 674 1
8 PSR J1614-2230 Psr 16 14 36.5070 -22 30 31.207           ~ 277 1
9 PSR J1741-2054 Psr 17 41 57.282 -20 54 04.11           ~ 93 1
10 V* V479 Sct HXB 18 26 15.0561532140 -14 50 54.249464136 12.02 12.23 11.27 11.04   ON6V((f))z 492 2
11 PSR J1836+5925 Psr 18 36 13.661 +59 25 29.77           ~ 123 1
12 PSR J2021+4026 Psr 20 21 30.496 +40 26 53.56           ~ 207 2

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:10:02

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