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The VELA-X-Pulsar Wind Nebula Revisited with Four Years of Fermi Large Area Telescope Observations
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The VELA-X-Pulsar Wind Nebula Revisited with Four Years of Fermi Large Area Telescope Observations
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Journal Article
The VELA-X-Pulsar Wind Nebula Revisited with Four Years of Fermi Large Area Telescope Observations
2013
Overview
The Vela supernova remnant (SNR) is the closest SNR to Earth containing an active pulsar, the Vela pulsar (PSR B0833-45). This pulsar is an archetype of the middle-aged pulsar class and powers a bright pulsar wind nebula (PWN), Vela-X, spanning a region of 2deg × 3deg south of the pulsar and observed in the radio, X-ray, and very high energy γ-ray domains. The detection of the Vela-X PWN by the Fermi Large Area Telescope (LAT) was reported in the first year of the mission. Subsequently, we have reinvestigated this complex region and performed a detailed morphological and spectral analysis of this source using 4 yr of Fermi-LAT observations. This study lowers the threshold for morphological analysis of the nebula from 0.8 GeV to 0.3 GeV, allowing for the inspection of distinct energy bands by the LAT for the first time. We describe the recent results obtained on this PWN and discuss the origin of the newly detected spatial features.
Publisher
NASA/Langley Research Center
Subject
