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The Astrophysical Journal 738 (2011) 114
SUB-LUMINOUS γ -RAY PULSARS
R. W. Romani, M. Kerr, H. A. Craig, S. Johnston, I. Cognard1, 2, D. A. Smith3
(01/09/2011)

Most pulsars observed by the Fermi Large Area Telescope have γ -ray luminosities scaling with spin-down power ˙E as Lγ ≈ ( ˙E × 1033 erg s−1)1/2. However, there exist one detection and several upper limits an order of magnitude or more fainter than this trend. We describe these "sub-luminous" γ -ray pulsars and discuss the case for this being an orientation effect. Of the 12 known young radio pulsars with ˙ E > 1034 erg s−1 and d 2 kpc several are substantially sub-luminous. The limited available geometrical constraints favor aligned geometries for these pulsars, although no one case for alignment is compelling. In this scenario GeV emission detected from such sub-luminous pulsars can be due to a lower altitude, lower-power accelerator gap.
1 :  LPCE - Laboratoire de physique et chimie de l'environnement
2 :  USN - Unité Scientifique de la Station de Nançay
3 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
GLAST
Physique/Astrophysique/Astrophysique galactique

Planète et Univers/Astrophysique/Astrophysique galactique
gamma rays: stars - pulsars: general