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M31 gamma-ray emission - a closer look at different explanations
Christopher Eckner, Pasquale D. Serpico, Jovana Petrovic, Tijana Prodanovic, 2017, published scientific conference contribution

Keywords: Milky Way, M31, gamma-rays, millisecond pulsars, dark matter
Published in RUNG: 30.01.2018; Views: 4079; Downloads: 149
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Very high-energy gamma-ray signature of ultrahigh-energy cosmic-ray acceleration in Centaurus A
Jagdish Joshi, Marlui Miranda, Lili Yang, Soebur Razzaque, 2017, published scientific conference contribution abstract

Abstract: The association of at least a dozen ultrahigh-energy cosmic-ray (UHECR) events with energy 54 EeV or higher detected by the Pierre Auger Observatory from the direction of Centaurus-A, the nearest radio galaxy, supports the scenario of UHECR acceleration in the jets of radio galaxies. Multiwavelength observations of Centaurus-A suggest that the inner jet is likely the site for particle acceleration, which emits in X-ray to very high-energy (VHE) gamma-ray. We model broadband spectral energy distribution with emission from shock-accelerated electrons and protons in a combined synchrotron-self-Compton and photo-hadronic scenario. The UHECR flux from Centaurus-A, required to explain Pierre Auger data, successfully explains observed VHE gamma rays as photo-hadronic emission.
Keywords: Centaurus A, gamma ray, cosmic rays
Published in RUNG: 17.01.2018; Views: 3302; Downloads: 0
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Ricerca di segnali di decadimento di materia oscura nell'emissione gamma isotropa rilevata dall'esperimento Fermi-LAT
Valentina Buran, master's thesis

Keywords: gamma rays
Published in RUNG: 28.08.2017; Views: 3951; Downloads: 0
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Observations of M31 and M33 with the Fermi Large Area Telescope: A Galactic Center Excess in Andromeda?
Gabrijela Zaharijas, 2017, original scientific article

Keywords: gamma-rays, Fermi LAT, Andromeda galaxy
Published in RUNG: 07.03.2017; Views: 4513; Downloads: 1
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Gabrijela Zaharijas, Collaboration Fermi LAT, Collaboration LIGO, 2016, original scientific article

Abstract: The Fermi Large Area Telescope (LAT) has an instantaneous field of view (FoV) covering ~1 5 of the sky and it completes a survey of the entire sky in high-energy gamma-rays every 3 hr. It enables searches for transient phenomena over timescales from milliseconds to years. Among these phenomena could be electromagnetic counterparts to gravitational wave (GW) sources. In this paper, we present a detailed study of the LAT observations relevant to Laser Interferometer Gravitational-wave Observatory (LIGO) event GW150914, which is the first direct detection of gravitational waves and has been interpreted as being due to the coalescence of two stellar-mass black holes. The localization region for GW150914 was outside the LAT FoV at the time of the GW signal. However, as part of routine survey observations, the LAT observed the entire LIGO localization region within ∼70 minutes of the trigger and thus enabled a comprehensive search for a γ-ray counterpart to GW150914. The study of the LAT data presented here did not find any potential counterparts to GW150914, but it did provide limits on the presence of a transient counterpart above 100 MeV on timescales of hours to days over the entire GW150914 localization region.
Keywords: gravitational waves, gamma rays
Published in RUNG: 20.06.2016; Views: 4770; Downloads: 0
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