Constraining Dwarf Spheroidal Dark Matter Halos With The Galactic Center Excess

If the gamma-ray excess from the galactic center reported by Fermi-LAT is a signal from annihilating dark matter, one must question why a similar excess has not been observed in dwarf spheroidal galaxies. We use this observation to place constraints on the density profile of dwarf spheroidal galaxies under the assumption that the galactic center excess is in fact a signal from annihilating dark matter. We place constraints on the generalized NFW parameter $\gamma$ and the Einasto profile parameter $\alpha$ which control the logarithmic slope of the inner regions of the halo's density profile. We determine that under these assumptions the galactic center excess is inconsistent with the standard NFW profile (and other `cuspy' profiles) for dwarf spheroidal galaxies , but is consistent with observations of cored dwarf galaxy profiles. Specifically, we find that dwarf spheroidal profiles must be less cuspy than that of the Milky Way. Models of dark matter which self-interacts through a light mediator can achieve this.Comment: 8 pages, 5 figure

Les articles 8, 9 et 10 de la Charte canadienne des droits et libertés

Legal rights protected under sections 8, 9 and 10 of the Canadian Charter of Rights and Freedoms are the subject of this article. Section 8 affords protection against unreasonable search or seizure; there was no similar provision under the Canadian Bill of Rights. Authorized searches and seizures by warrant will be considered unreasonable whenever minimal standards laid down in section 443 of the Criminal Code have not been respected. Furthermore, searches or seizures without warrant will be judged unreasonable if they do not conform to the legal provisions under which they are authorized. Section 9 protects against arbitrary detention or imprisonment. Some judges deem detention to be arbitrary if it is not authorized under statute, while others feel that detention is arbitrary whether authorized by statute or not if it be capricious or unreasonable. Finally, section 10 provides for certain rights to a person who is arrested or detained, such as the right to be informed of the reasons for arrest or detention, the right to be informed of his or her right to retain and instruct counsel and the right to do so, and the right to have the validity of the detention ascertained