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131.
Ispitivanje viška gama zračenja iz galaktičkog centra pomoću Fermi LAT i Gamma400 teleskopa
Jovana Petrovic, 2014, master's thesis

Keywords: gamma-ray emission, milli-secon pulsars
Published in RUNG: 06.05.2016; Views: 4841; Downloads: 0
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132.
Constraints on the Galactic Dark Matter signal from the Fermi-LAT measurement of the diffuse gamma-ray emission
Gabrijela Zaharijas, 2012, published scientific conference contribution

Abstract: We study diffuse gamma-ray emission at intermediate Galactic latitudes measured by the Fermi Large Area Telescope with the aim of searching for a signal from dark matter annihilation or decay. In the absence of a robust dark matter signal, constraints are presented. We set both, conservative dark matter limits requiring that the dark matter signal does not exceed the observed diffuse gamma-ray emission and limits derived based on modeling the foreground astrophysical diffuse emission. Uncertainties in several parameters which characterize conventional astrophysical emission are taken into account using a profile likelihood formalism. The resulting limits impact the range of particle masses over which dark matter thermal production in the early Universe is possible, and challenge the interpretation of the PAMELA/Fermi-LAT cosmic ray anomalies as annihilation of dark matter.
Keywords: gamma rays, Galactic diffuse emission, dark matter serach
Published in RUNG: 03.05.2016; Views: 5322; Downloads: 0
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134.
Search for Spectral Irregularities due to Photon-Axionlike-Particle Oscillations With the Fermi Large Area Telescope
Gabrijela Zaharijas, 2016, original scientific article

Keywords: dark matter, gammarays theory, gamma rays experiment
Published in RUNG: 26.04.2016; Views: 5857; Downloads: 0
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135.
Galactic Dark Matter signal and the Fermi-LAT measurement of the diffuse gamma-ray emission
Gabrijela Zaharijas, published scientific conference contribution

Abstract: We study diffuse gamma-ray emission at intermediate Galactic latitudes measured by the Fermi LAT with the aim of searching for a signal from dark matter annihilation or decay. In the absence of a robust dark matter signal, constraints are presented. We present and improve upon conservative dark matter limits obtained with no modeling of the foreground astrophysical diffuse emission. We do so, by taking into account uncertainties in several parameters which characterize conventional astrophysical emission and using a profile likelihood formalism. The resulting limits impact the range of particle masses over which dark matter thermal production in the early Universe is possible, and challenge the interpretation of the PAMELA/Fermi-LAT cosmic ray anomalies as annihilation of dark matter.
Keywords: Dark matter, high-energy gamma rays
Published in RUNG: 21.03.2016; Views: 5333; Downloads: 0
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