Discovery of Pulsed $\gamma$-rays from PSR J0034-0534 with the Fermi LAT: A Case for Co-located Radio and $\gamma$-ray Emission Regions

Abstract

Millisecond pulsars (MSPs) have been firmly established as a class of gamma-ray emitters via the detection of pulsations above 0.1 GeV from eight MSPs by the Fermi Large Area Telescope (LAT). Using thirteen months of LAT data significant gamma-ray pulsations at the radio period have been detected from the MSP PSR J0034-0534, making it the ninth clear MSP detection by the LAT. The gamma-ray light curve shows two peaks separated by 0.274$\pm$0.015 in phase which are very nearly aligned with the radio peaks, a phenomenon seen only in the Crab pulsar until now. The $\ge$0.1 GeV spectrum of this pulsar is well fit by an exponentially cutoff power law with a cutoff energy of 1.8$\pm 0.6\pm$0.1 GeV and a photon index of 1.5$\pm 0.2\pm$0.1, first errors are statistical and second are systematic. The near-alignment of the radio and gamma-ray peaks strongly suggests that the radio and gamma-ray emission regions are co-located and both are the result of caustic formation.

20 pages, 3 figures, 2 tables. Accepted for publication in ApJ

References in corpus (11)

• TEMPO2, a new pulsar timing package. I: Overview
• A Radio Pulsar/X-ray Binary Link
• The First Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• Fermi Large Area Telescope Observations of the Crab Pulsar and Nebula
• High-Altitude Emission from Pulsar Slot Gaps: The Crab Pulsar
• Profile and polarization characteristics of energetic pulsars
• Probing millisecond pulsar emission geometry using light curves from the Fermi Large Area Telescope
• The Vela Pulsar: Results from the First Year of Fermi LAT Observations
• Gamma ray astrophysics: the EGRET results
• Discovery of new gamma-ray pulsars with AGILE
• The nature of pulsar radio emission

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• Population study for gamma-ray pulsars: (III) Radiation characteristics and viewing geometry
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• New Neighbours: Modelling the Growing Population of Gamma-ray Millisecond Pulsars
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