Observations of the Sagittarius dwarf galaxy by the HESS experiment and search for a dark matter signal

Link:

https://doi.org/10.1016/j.astropartphys.2007.11.007

Erscheinungsjahr:

2008

Medientyp:

Text

Schlagworte:

Dark matter
Dwarf spheroidal galaxy
Gamma-rays: observations

Beschreibung:

Observations of the Sagittarius dwarf spheroidal (Sgr dSph) galaxy were carried out with the HESS array of four imaging air Cherenkov telescopes in June 2006. A total of 11 h of high quality data are available after data selection. There is no evidence for a very high energy γ-ray signal above the energy threshold at the target position. A 95% CL flux limit of 3.6 × 10- 12 cm- 2 s- 1 above 250 GeV has been derived. Constraints on the velocity-weighted cross-section 〈 σ v 〉 are calculated in the framework of dark matter particle annihilation using realistic models for the dark matter halo profile of Sagittarius dwarf galaxy. Two different models have been investigated encompassing a large class of halo types. A 95% CL exclusion limit on 〈 σ v 〉 of the order of 2 × 10- 25 cm3 s- 1 is obtained for a core profile in the 100 GeV-1 TeV neutralino mass range. © 2007 Elsevier B.V. All rights reserved.

Lizenz:

info:eu-repo/semantics/closedAccess

Quellsystem:

Forschungsinformationssystem der UHH

Interne Metadaten

Quelldatensatz: oai:www.edit.fis.uni-hamburg.de:publications/c63f42da-feb0-4750-9a08-2f0eb2d6f291