Gamma-rays from the new SNR G150.3+4.5
A. R. Mysore
J. W. Hewitt, J. Cohen, M. Lemoine-Goumard, Fermi Collaboration
Abstract:
A search of the Galactic plane for extended gamma-ray sources in the 50 GeV to 2 TeV energy range as part of the Second LAT High-Energy Catalog (2FHL) uncovered an unidentified extended source coincident with the faint radio SNR G150.3+4.5 (Gao & Han, 2014). Using the latest Pass 8 data we have extended the analysis of this source down to a lower energy of 1 GeV. We confirm that the extended LAT source is well-matched to the size and location of the radio SNR. The large angular size and faintness suggest a very old age for G150.3+4.5. However, gamma-ray emission follows a hard power-law index of -1.8, similar to that of young shell-type remnants (e.g. RX J1713.7-3946). The existing multi-wavelength observations of this SNR limit our ability to discriminate between models of the gamma-ray emission mechanism. The unusual properties of this new gamma-ray SNR make it a very promising target for further investigations. Future multi-wavelength observations promise to constrain models of particle acceleration occurring in SNR G150.3+4.5.
- Curator: J.D. Myers
- NASA Official: Phil Newman
- Science Official: Elizabeth Hays
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