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Evidence for Strong Extragalactic Magnetic Fields from Fermi Observations of TeV Blazars
A lower bound B ≥ 3 × 10−16 gauss on the strength of intergalactic magnetic fields is reported, which stems from the nonobservation of GeV gamma-ray emission from electromagnetic cascade initiated by tera–electron volt gamma rays inintergalactic medium.
XMM–Newton observations of PSR B1259−63 near the 2004 periastron passage
PSR B1259−63 is in a highly eccentric 3.4-yr orbit with a Be star and crosses the Be star disc twice per orbit, just prior to and just after periastron. Unpulsed radio, X-ray and gamma-ray emission
EGMF Constraints from Simultaneous GeV-TeV Observations of Blazars
Attenuation of the TeV gamma-ray flux from distant blazars through pair production with extragalactic background light leads to the development of electromagnetic cascades and subsequent, lower
Discovery of high-energy gamma-ray emission from the binary system PSR B1259–63/LS 2883 around periastron with Fermi
We report on the discovery of 100 MeV γ -rays from the binary system PSR B1259−63/LS 2883 using the Large Area Telescope (LAT) on board Fermi. The system comprises a radio pulsar in orbit around a Be
Fermi/LAT Observations of 1ES 0229+200: Implications for Extragalactic Magnetic Fields and Background Light
We report the observation in the GeV band of the blazar 1ES 0229+200, which over recent years has become one of the primary sources used to put constraints on the extragalactic background light (EBL)
INTEGRAL and XMM–Newton observations of LSI +61° 303
LSI +61 ◦ 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy gamma-ray emission have been observed. We present XMM-Newton and INTEGRAL observations
X-ray observations of PSR B1259−63 near the 2007 periastron passage
PSR B1259‐63 is a 48 ms radio pulsar in a highly eccentric 3.4 year orbit with a Be star SS 2883. Unpulsedγ-ray, X-ray and radio emission components are observed from the binary system. It is likely
Cosmological magnetic fields: their generation, evolution and observation
We review the possible mechanisms for the generation of cosmological magnetic fields, discuss their evolution in an expanding Universe filled with the cosmic plasma and provide a critical review of
Constraints on 3.55 keV line emission from stacked observations of dwarf spheroidal galaxies
Several recent works have reported the detection of an unidentified x-ray line at 3.55 keV, which could possibly be attributed to the decay of dark matter (DM) particles in the halos of galaxy
INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth
Aims. We study the spectrum of the cosmic X-ray background (CXB) in energy range ∼5−100 keV. Methods. Early in 2006 the INTEGRAL observatory performed a series of four 30 ks observations with the