Discovery of a new galactic center excess consistent with upscattered starlight

作者：Abazajian Kevork N^*; Canac Nicolas; Horiuchi Shunsaku; Kaplinghat Manoj; Kwa Anna

来源：Journal of Cosmology and Astroparticle Physics, 2015, 2015(7): 013.

DOI：10.1088/1475.7516/2015/07/013

• dark matter experiments
• gamma ray experiments
• absorption and radiation processes
• dark matter theory

We present a new extended gamma ray excess detected with the Fermi Satellite Large Area Telescope toward the Galactic Center that traces the morphology of infrared starlight emission. Combined with its measured spectrum, this new extended source is approximately consistent with inverse Compton emission from a high-energy electron-positron population with energies up to about 10 GeV. Previously detected emissions tracing the 20 cm radio, interpreted as bremsstrahlung radiation, and the Galactic Center Extended emission tracing a spherical distribution and peaking at 2 GeV, are also detected. We show that the inverse Compton and bremsstrahlung emissions are likely due to the same source of electrons and positrons. All three extended emissions may be explained within the framework of a model where the dark matter annihilates to leptons or a model with unresolved millisecond pulsars in the Galactic Center.

• 出版日期2015-7
• 单位Virginia Tech; 美国弗吉尼亚理工大学(Virginia Tech)