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Fermi-LAT detection of gamma-ray emission in the vicinity of the star forming regions W43 and Westerlund 2

Abstract : Particle acceleration in massive star forming regions can proceed via a large variety of possible emission scenarios, including high-energy gamma-ray production in the colliding wind zone of the massive Wolf-Rayet binary (here WR 20a and WR121a), collective wind scenarios, diffusive shock acceleration at the boundaries of wind-blown bubbles in the stellar cluster, and outbreak phenomena from hot stellar winds into the interstellar medium. In view of the recent Fermi-LAT detection of HESS J1023-575 (in the vicinity of Westerlund 2), we examine another very high energy (VHE) gamma-ray source, HESS J1848-0145 (in the vicinity of W43), possibly associated with a massive star cluster. Considering data from other wavelengths, in particular X-rays and TeV gamma-rays, we examine the available evidence that the gamma-ray emission from Westerlund 2 and W43 could originate in particles accelerated by the above-mentioned mechanisms in massive star clusters.
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http://hal.in2p3.fr/in2p3-00608900
Contributor : Virginie Mas <>
Submitted on : Friday, July 15, 2011 - 10:03:57 PM
Last modification on : Thursday, January 11, 2018 - 6:12:50 AM

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  • HAL Id : in2p3-00608900, version 1

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E. Ferrara, M.H. Grondin, M. Lemoine-Goumard, P. Martin, M. Renaud. Fermi-LAT detection of gamma-ray emission in the vicinity of the star forming regions W43 and Westerlund 2. Cosmic rays and their interstellar medium environment (CRISM-2011), Jun 2011, Montpellier, France. ⟨in2p3-00608900⟩

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