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Pulsar TeV Halos Explain the Diffuse TeV Excess Observed by Milagro.

Tim Linden¹, Benjamin J Buckman¹

¹Center for Cosmology and AstroParticle Physics (CCAPP), and Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.

Physical Review Letters

|April 26, 2018

Summary

This summary is machine-generated.

Pulsars may explain the Milky Way's mysterious "TeV excess." Their surrounding "TeV halos" collectively create diffuse, bright gamma-ray emission, matching observations and potentially resolving a major astrophysics puzzle.

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Area of Science:

Astrophysics
Gamma-ray astronomy
High-energy physics

Background:

Milagro observations revealed bright, diffuse TeV gamma-ray emission along the galactic plane.
The observed intensity and spectrum of this emission, termed the "TeV excess," challenges current hadronic gamma-ray production models.

Purpose of the Study:

To investigate whether TeV emission from pulsars can naturally explain the observed "TeV excess."
To analyze the contribution of pulsars to diffuse TeV emission in the Milky Way.

Main Methods:

Extrapolating observed
TeV halos
surrounding pulsars to the entire Milky Way population.
Modeling the collective emission from these pulsars.

Main Results:

The ensemble of pulsars, including "subthreshold" sources, produces bright, diffuse TeV emission matching the galactic plane's excess.
TeV halo emission is predicted to dominate over hadronic gamma rays above ~500 GeV.
The spectrum and intensity of this pulsar-driven emission align with the "TeV excess."

Conclusions:

Pulsar-powered TeV halos provide a natural explanation for the Milky Way's diffuse TeV emission.
Upcoming HAWC (High Altitude Water Cherenkov Observatory) observations are expected to validate or refute this pulsar emission model by resolving individual TeV halos.