Two-photon annihilation in the pair formation cascades in pulsar polar caps
| dc.creator | Zhang, Bing | |
| dc.creator | Qiao, G. J. | |
| dc.date | 1998-06-19 | |
| dc.date.accessioned | 2026-07-07T02:27:14Z | |
| dc.date.available | 2026-07-07T02:27:14Z | |
| dc.description | The importance of the photon-photon pair production process ($γ+ γ^{\prime}\to e^{+}+e^{-}$) to form pair production cascades in pulsar polar caps is investigated within the framework of the Ruderman-Sutherland vacuum gap model. It is found that this process is unimportant if the polar caps are not hot enough, but will play a non-negligible role in the pair formation cascades when the polar cap temperatures are in excess of the critical temperatures, $T_{cri}$, which are around $4\times 10^6K$ when $P=0.1$s and will slowly increase with increasing periods. Compared with the $γ-B$ process, it is found that the two-photon annihilation process may ignite a central spark near the magnetic pole, where $γ-B$ sparks can not be formed due to the local weak curvatures. This central spark is large if the gap is dominated by the ``resonant ICS mode''. The possible connection of these central sparks with the observed pulsar ``core'' emission components is discussed. | |
| dc.description | 7 pages, 3 Postscript figures, LaTex, accepted for publication in Astronomy and Astrophysics | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9806262 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9806262 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/12607 | |
| dc.subject | Astrophysics | |
| dc.title | Two-photon annihilation in the pair formation cascades in pulsar polar caps | |
| dc.type | text |