Updated Results from VERITAS on the Crab Pulsar
Thanh Nguyen (for the VERITAS Collaboration)
TL;DR
This paper presents updated VERITAS observations of the Crab pulsar, revealing gamma-ray emissions above 100 GeV that challenge existing models and suggest emission regions near or beyond the light cylinder.
Contribution
It provides new, larger data set analysis that refines understanding of gamma-ray emission regions in the Crab pulsar's magnetosphere.
Findings
Detection of pulsed gamma-ray emission above 100 GeV
Results challenge traditional pulsar emission models
Emission region likely near or beyond the light cylinder
Abstract
The Crab pulsar and plerion are some of the brightest and best studied non-thermal astrophysical sources. The recent discovery of pulsed gamma-ray emission above 100 gigaelectronvolts (GeV) from the Crab pulsar with VERITAS (the Very Energetic Radiation Imaging Telescope Array System) challenges commonly accepted pulsar emission models and puts the gamma-ray emission region far out in the magnetosphere - close to or even beyond the light cylinder. We present updated VERITAS results from the analysis of a data set that is twice as large as the original data set published in 2011. The results are discussed in the context of discriminating between different models put forward to explain gamma-ray emission mechanisms and acceleration regions within the Crab pulsar's magnetosphere.
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