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Parameter estimation with gravitational waves

Christensen, Nelson; Meyer, Renate

The new era of gravitational wave astronomy truly began on September 14, 2015, with the detection of GW150914, the sensational first direct observation of gravitational waves from the inspiral and merger of two black holes by the two Advanced LIGO detectors. In the subsequent first three observing runs of the LIGO-Virgo network, gravitational wave…

The 511 keV emission from positron annihilation in the Galaxy

Moskalenko, I. V.; Marcowith, A.; Diehl, R. +9 more

The first γ-ray line originating from outside the Solar System that was ever detected is the 511 keV emission from positron annihilation in the Galaxy. Despite 30 years of intense theoretical and observational investigation, the main sources of positrons have not been identified up to now. Observations in the 1990s with OSSE/CGRO (Oriented Scintil…