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In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
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Multiple Galactic Sources with Emission Above 56 TeV Detected by HAWC.

A U Abeysekara1, A Albert2, R Alfaro3

  • 1Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USA.

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The High Altitude Water Cherenkov Observatory catalog reveals nine gamma-ray sources above 56 TeV, likely galactic. Three sources extend past 100 TeV, representing the highest-energy gamma-ray catalog to date.

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Area of Science:

  • High-energy astrophysics
  • Gamma-ray astronomy

Background:

  • The High Altitude Water Cherenkov (HAWC) Observatory detects gamma rays up to a few hundred TeV.
  • Understanding the origin and acceleration mechanisms of high-energy cosmic rays is a key challenge in astrophysics.

Purpose of the Study:

  • To present the first catalog of gamma-ray sources detected above 56 TeV and 100 TeV.
  • To identify and characterize the highest-energy gamma-ray emitters.

Main Methods:

  • Utilizing data from the High Altitude Water Cherenkov Observatory.
  • Analyzing gamma-ray signals above 56 TeV and 100 TeV.
  • Calculating integral fluxes and spectral properties of detected sources.

Main Results:

  • Cataloging nine gamma-ray sources above 56 TeV, all likely of galactic origin.
  • Identifying three sources emitting above 100 TeV, establishing a new record for the highest-energy gamma-ray catalog.
  • Reporting integral fluxes for all nine sources and detailed spectra for the three most energetic sources.

Conclusions:

  • The catalog provides crucial data for understanding extreme astrophysical phenomena.
  • The detection of sources above 100 TeV supports the existence of Peatron candidates.
  • Further studies of these sources can shed light on cosmic-ray acceleration processes in the galaxy.