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High Energy Astrophysics
Death Line of Gamma-ray Pulsars with Outer Gaps |
Image Credit: Kouichi Hirotani
Figure 2 of "Death Line of Gamma-ray Pulsars with Outer Gaps",
Ren-Bo Wang and Kouichi Hirotani, ApJ 736, 127 (2011).
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By the advent of Fermi space observatory, the number of rotation-powered,
gamma-ray pulsars has been increased from seven to more than one hundred.
Thus, it is desired to derive a theoretical condition for a pulsar
to become a gamma-ray emitter in a wide pulsar parameter space.
On these grounds, we derived the death line (red, solid line) of
high-energy pulsars on the period versus period-derivative plane,
by analyzing the condition for an outer-magnetospheric accelerator
to be maintained by photon-photon pair productions.
The thin dotted lines express the parameter region that gives the
labeled magnetic-field strength at the light cylinder.
The (blue) large points denote the gamma-ray detected pulsars, whereas
the (green) small open circles the X-ray detected ones.
The entire parameter space is depicted in the left panel, while
a close up of millisecond parameter range is depicted in the right panel.
This theoretical prediction (red line) is being testified
by various X-ray and gamma-ray observations. |