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Fermi-LAT Discovery of GeV Gamma-ray Emission from the Vicinity of SNR W44

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arxiv 1203.3234 v1 pith:EV4YANN5 submitted 2012-03-14 astro-ph.HE

Yasunobu Uchiyama , Stefan Funk , Hideaki Katagiri , Junichiro Katsuta , Marianne Lemoine-Goumard , Hiroyasu Tajima , Takaaki Tanaka , Diego Torres This is my paper · ORCID
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keywords emissiongamma-raycloudcomplexmolecularremnantagreementappears
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We report the detection of GeV gamma-ray emission from the molecular cloud complex that surrounds the supernova remnant (SNR) W44 using the Large Area Telescope (LAT) onboard Fermi. While the previously reported gamma-ray emission from SNR W44 is likely to arise from the dense radio-emitting filaments within the remnant, the gamma-ray emission that appears to come from the surrounding molecular cloud complex can be ascribed to the cosmic rays (CRs) that have escaped from W44. The non-detection of synchrotron radio emission associated with the molecular cloud complex suggests the decay of neutral pi mesons produced in hadronic collisions as the gamma-ray emission mechanism. The total kinetic energy channeled into the escaping CRs is estimated to be (0.3--3)x10^{50} erg, in broad agreement with the conjecture that SNRs are the main sources of Galactic CRs.

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  1. Gamma-ray emission from particle illumination and shock-cloud interaction in the W51 Complex

    astro-ph.HE 2026-07 conditional novelty 5.0 of 10

    A model in which particles were injected into the W51B molecular cloud for 420 years about 18,000 years ago and stayed confined reproduces LHAASO's ultra-high-energy gamma-ray spectrum of W51, whereas direct SNR-cloud...

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