Speaker
Description
The young star clusters/star forming regions have been believed to be the Galactic CRs contributors. As the CR acceleration sites, the collective effect of stellar winds and/or supernova activity in the young stellar associations can produce a large-scale shock, which will accelerate the particles up to energies of hundreds of TeV. And these high-energy particles can produce the multi-wavelength emission by the different radiation mechanisms. The GeV or TeV gamma-ray emission from such sources also have been detected, like Cygnus Cocoon, Westerlund 1, etc. The W49 region is one of the most interacting regions in the Galaxy to study the CR acceleration and it contains two components: a star forming region W49A and a young SNR W49B. W49A, located 0.21o to the west of the SNR W49B, is one of the massive star formation region in the Galaxy and one of the richest clusters known. Using the Pass 8 Fermi-LAT data, we did a detailed analysis around W49A and found that the gamma-ray emission contains two spectral components. One has the soft spectrum and steady emission, while another has the hard spectrum and variable emission. We also discuss the possible origins of the gamma-ray emission of different components.
| Subcategory | Experimental Results |
|---|
