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Diffuse gamma-ray emission around the Rosette Nebula

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arxiv 2309.03577 v2 pith:CXAAGHXS submitted 2023-09-07 astro-ph.HE

Diffuse gamma-ray emission around the Rosette Nebula

classification astro-ph.HE
keywords nebularosettegamma-raytemplateclusterdataemissionfound
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Rosette Nebula is a young stellar cluster and molecular cloud complex, located at the edge of the southern shell of a middle-aged SNR Monoceros Loop (G205.5+0.5). We revisited the GeV gamma-ray emission towards the Rosette Nebula using more than 13 years of Fermi-LAT data. We tested several spatial models and found that compared to the result using the CO gas template only, the inclusion of the HII gas template can significantly improve the likelihood fit. We performed spectral analysis using the new spatial template. With both the gamma-ray observation and CO+HII gas data, we derived the cosmic ray spectrum of different components in the vicinity of the Rosette Nebula. We found the gamma-ray emissions from Rosette Nebula are substantially harder than previously reported, which may imply that Rosette Nebula is another example of a gamma-ray emitting young massive star cluster.

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