A Survey of Fermi Catalog Sources using data from the Milagro Gamma-Ray Observatory

TL;DR

This paper surveys gamma-ray sources detected by the Fermi LAT and Milagro observatory, highlighting new TeV detections and analyzing their spectral properties to understand high-energy astrophysical phenomena.

Contribution

It provides the first combined analysis of Fermi LAT sources with Milagro TeV data, identifying new sources and characterizing their energy spectra.

Findings

Six sources observed with >5 sigma significance by Milagro.

Nine pulsars among the detected sources.

Six sources are newly detected at TeV energies.

Abstract

The Fermi LAT has released a list of the most significant 205 sources with three months of Fermi data (Bright Source List). The Milagro Gamma-Ray Observatory is sensitive to gamma rays above 100 GeV with a peak sensitivity between 10 and 30 TeV, overlapping and extending the energy range of Fermi. Of the 34 Galactic LAT sources in the field of view of Milagro, 6 are observed with significance greater than 5 sigma and 14 are observed at greater than 3 sigma. Of these 14 sources, 9 are pulsars. Since the VHE emission detected by Milagro is often found to be extended and likely un-pulsed, the VHE component presumably arises from the pulsar winds. Six of the 14 sources have not been previously detected at TeV energies. The details of the Milagro survey will be presented. We will also present the energy spectra of the high-significance detections. Should the full 1-year source list be available prior to the symposium, we will expand our analysis to include the larger Fermi catalog.