Sub-luminous gamma-Ray pulsars

Details Sub-luminous gamma-Ray pulsars Sub-luminous gamma-Ray pulsars

2011-06-28

arxiv.org/abs/1106.5762v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

9 pages, 4 figures; accepted to the Astrophysical Journal

Scientific paper

Most pulsars observed by the Fermi LAT have gamma-ray luminosities scaling with spindown power Edot as L_gamma (Edot x 10^33 erg/s)^{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' gamma-ray pulsars, and discuss the case for this being an orientation effect. Of the 12 known young radio pulsars with Edot>10^34 erg/s and d<2kpc 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.

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