Home | Contact | Sitemap | 中文 | CAS
About Us Research People International Cooperation News Education & Training Join Us Journals Papers Resources Links
Location: Home > News > Seminars
  • Events
  • Seminars
  • Research Trends
  • Pinning down the origin of Galactic cosmic rays by using gamma-ray observations


    Seminar Title  

    Pinning down the origin of  Galactic cosmic rays by using gamma-ray observations

    Speaker:   DrTIAN Feng


    (The Max Planck institute of nuclear physics )  

    When Thurseday morning , Apr. 18, 10:00 a.m


    Room 502, Astronomy Building. (NJU)

                             Welcome to Attend   

      ( PMO Academic Committee & Academic Circulating committee)

       Abstract: The origin of Cosmic rays (CRs) still remains as a mystery. The diffusion of CRs in turbulent magnetic fields erases the information on the distribution of CR accelerators. The energy dependent diffusion of CRs also significantly modifies the initial (acceleration) spectra of CRs. As a result, gamma-rays, the secondaries from CR interaction with ambient gas, tell us more information about the origin of CRs. This can be done in two ways:     

           1. the gamma-ray emissions, especially those associated with ambient gas,  can be used to study the distribution of CR throughout the Galaxy. In this regard I will discuss the latest results of CR radial distribution by analysing the Fermi LAT as well as CO/HI/Infrared data.
           2. the discrete gamma-ray sources can elucidate the locations of individual CR accelerators. Here I will report the recent detection of extended young star cluster NGC 3603 and Westerlund 2.


    Copyright © Purple Mountain Observatory, CAS, No.8 Yuanhua Road, Qixia District, Nanjing 210034, China
    Phone: 0086 25 8333 2000 Fax: 8333 2091 http://english.pmo.cas.cn