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Updated: Jan 23, 2026

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

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Published on: June 12, 2016

Multi-TeV Emission From the Vela Pulsar.

Alice K Harding¹, Constantinos Kalapotharakos^1,2, Monica Barnard³

¹Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771.

The Astrophysical Journal. Letters

|June 20, 2019

Summary

This summary is machine-generated.

The Vela pulsar emits high-energy radiation up to 30 TeV. A new model explains its broad-band spectrum from infrared to very-high energies, matching observations and predicting future emissions.

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Published on: September 4, 2013

Area of Science:

* Astrophysics
* High-Energy Astronomy
* Pulsar Physics

Background:

* The H.E.S.S. II telescope detected pulsed emission from the Vela pulsar above 3 TeV.
* Pulsar magnetosphere simulations suggest particle acceleration in the equatorial current sheet.
* Understanding broad-band emission from pulsars is crucial for high-energy astrophysics.

Purpose of the Study:

* To develop a model for the Vela pulsar's broad-band spectrum from infrared to beyond 10 TeV.
* To explain the observed infrared-optical, GeV, and multi-TeV emissions.
* To investigate particle acceleration mechanisms within the pulsar magnetosphere.

Main Methods:

* Modeled broad-band spectrum using particle acceleration in the equatorial current sheet and polar cap cascades.
* Calculated synchrotron emission from electron-positron pairs for IR-optical radiation.
* Modeled curvature radiation for Fermi GeV emission and inverse-Compton scattering for very-high-energy emission.

Main Results:

* The model successfully accounts for observed infrared-optical emission via synchrotron radiation.
* Curvature radiation in the current sheet produces GeV emission from particles with 30-60 TeV.
* Inverse-Compton scattering of IR-optical photons explains very-high-energy emission up to 30 TeV.

Conclusions:

* The proposed model successfully reproduces the Vela pulsar's observed broad-band spectrum.
* Particle acceleration in the current sheet and polar cap cascades are key to Vela's emission.
* The model provides predictions for multi-TeV emission, guiding future observations.