26-30 July 2021
Zoom
Europe/Berlin timezone

Dissecting the inner Galaxy with gamma-ray pixel count statistics

28 Jul 2021, 10:10
20m
Zoom

Zoom

Parallel session talk Dark Matter T03: Dark Matter

Speaker

Francesca Calore (CNRS, LAPTh)

Description

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.
A 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.
In 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.
We 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.

[1] arXiv:2102.12497

Email calore@lapth.cnrs.fr
Collaboration / Activity Theory/Phenomenology
First author Francesca Calore

Primary author

Francesca Calore (CNRS, LAPTh)

Presentation Materials