The diffuse gamma-ray emission toward the Galactic mini starburst W43

Abstract

In this paper we report the Fermi Large Area Telescope (LAT) detection of the gamma-ray emission toward the young star forming region W43. Using the latest source catalog and diffuse background models, the extended gamma-ray excess is detected with a significance of about 16 $\sigma$. The gamma-ray emission has a spectrum with a photon index of $2.3\pm 0.1$. We also performed a detailed analysis of the gas content in this region by taking into account the opacity correction to the HI gas column density. The total cosmic-ray (CR) proton energy is estimated to be on the order of $10^{48}\mathrm{erg},$ assuming the gamma-ray are produced from the interaction of the accelerated protons and nuclei with the ambient gas. Comparing this region to the other star formation regions in our Galaxy, we find that the CR luminosity is better correlated with the wind power than the star formation rate (SFR). This result suggests that CRs are primarily accelerated by stellar wind in these systems

accepted for publications in A&A

References in corpus (8)

• The ATNF Pulsar Catalogue
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• The VLA Galactic Plane Survey
• FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) I: Project Overview and Initial Results
• The Initial Mass Function of the Massive Star-forming Region NGC 3603 from Near-Infrared Adaptive Optics observations
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Cited by in corpus (5)

• A deep spectromorphological study of the $\gamma$-ray emission surrounding the young massive stellar cluster Westerlund 1
• Gamma-ray observation towards the young massive star cluster NGC 6618 in the M17 region
• Probing the hadronic nature of the gamma-ray emission associated with Westerlund 2
• CRAFT (Cosmic Ray Acceleration From Turbulence) in Molecular Clouds
• Probing the star formation origin of gamma rays from 3FHL J1907.0+0713