Dissecting the inner Galaxy with gamma-ray pixel count statistics

Discussion timeslot (ZOOM-Meeting): 12. July 2021 - 18:00

ZOOM-Meeting URL: https://desy.zoom.us/j/98542982538

ZOOM-Meeting ID: 98542982538

ZOOM-Meeting Passcode: ICRC2021

Corresponding Session: https://icrc2021-venue.desy.de/channel/51-The-Census-of-Gamma-Ray-Sources-GAD-GAI/43

Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-04/5

Abstract:

"The nature of the GeV gamma-ray Galactic center excess (GCE) in the data of Fermi-LAT is still under investigation. Different techniques, such as template fitting and photon-count statistical methods, have been applied in the past few years in order to disentangle between a GCE coming from sub-threshold point sources or rather from diffuse emissions, such as the dark matter annihilation in the Galactic halo. rnA major limit to all these studies is the modeling of the Galactic diffuse foreground, and the impact of residual mis-modeled emission on the results' robustness.rnIn Ref.[1], we combine for the first time adaptive template fitting and pixel count statistical methods in order to assess the role of sub-threshold point sources to the GCE, while minimizing the mis-modelling of diffuse emission components.rnWe reconstruct the flux distribution of point sources in the inner Galaxy well below the Fermi-LAT detection threshold, and measure their radial and longitudinal profiles. We find that point sources and diffuse emission from the Galactic bulge each contributes about 10% of the total emission therein, disclosing a sub-threshold point-source contribution to the GCE.rnrn[1] arXiv:2102.12497"

Authors: Silvia Manconi

Co-Authors: Fiorenza Donato | Francesca Calore

Indico-ID: 562

Proceeding URL: https://pos.sissa.it/395/677