17-22 July 2016
Master Cutlers Hall
Europe/London timezone

Gamma-ray emission and the dark matter content of the dwarf galaxy Reticulum II

18 Jul 2016, 14:40
20m
Venue: Cutlers' Drawing Room (First Floor); Chair: Catherine De Clercq; Session Manager: Anthony Ezeribe ()

Venue: Cutlers' Drawing Room (First Floor); Chair: Catherine De Clercq; Session Manager: Anthony Ezeribe

Speaker

Prof. Savvas Koushiappas (Brown University)

Description

I will present results on the analysis of gamma-ray emission from the recently discovered dwarf galaxy Reticulum II. Using Fermi-LAT data and a suite of background models we quantify the probability that the observed gamma-ray emission is due to background. Reticulum II is found to have the most significant gamma-ray emission from any other known dwarf galaxy. I will also discuss the dark matter content of Reticulum II as derived from kinematic studies of its member stellar population and show that Reticulum II has a dark matter halo similar to other nearby dwarf galaxies. If the gamma ray emission is due to dark matter annihilation, the annihilation cross section is consistent with the s-wave relic abundance cross section. I will conclude by discussing further tests that are needed in order to ascertain the likelihood of this emission to be due to a conventional astrophysical interpretation.

Primary author

Prof. Savvas Koushiappas (Brown University)

Presentation Materials

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