MAXI J1820+070 shows no significant very high energy gamma-ray emission above 182 GeV despite a bright X-ray outburst, and optical transient activity drops sharply during state transitions.
Microquasars: hard X-ray/gamma-ray emission
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abstract
I review some of the basic observational details of jets from X-ray binaries, or `microquasars'. It is shown that in both (Z and Atoll) NS and BHC systems radio emission, and therefore jet formation, is correlated with the presence of hard (30-500 keV) X-ray emission. At gamma-ray (> 500 keV) energies, the relation is not so clear. Possible physical connections between the presence of a jet, with a population of relativistic electrons, and the emission of hard X-rays, are briefly discussed.
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Multi-wavelength observation of MAXI J1820+070 with MAGIC, VERITAS and H.E.S.S
MAXI J1820+070 shows no significant very high energy gamma-ray emission above 182 GeV despite a bright X-ray outburst, and optical transient activity drops sharply during state transitions.