Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 86: Multi-Messenger

T 86.8: Vortrag

Donnerstag, 28. März 2019, 17:45–18:00, S13

The diffuse gamma-ray excess from the galactic center and its correlation with CO emission — •Iris Gebauer1, Neeraj Amin1, Wim de Boer1, and Peter Biermann21Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Universität Bonn and University of Alabama

The Fermi-LAT has observed an excess in the diffuse emission from the Galactic center around a few GeV. This excess was previously observed by the EGRET instrument onboard CGRT, but the accurate Fermi-LAT data have triggered significant interest in the origin of the excess. Possible interpretations discussed in the literature are the annihilation or the decay of dark matter, a population of milisecond pulsars and emission from molecular clouds. We have found a correlation with the distribution of molecular clouds, traced by the CO emission line. Assuming that the excess emission indeed originates from molecular clouds we determined the spectrum of this component of gamma radiation from the Fermi-LAT data. The derived spectrum is compatible with a depletion of gamma-ray production within molecular clouds.

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