Is the Galactic center annihilator 1E 1740.7-2942 a source of MeV Gamma-ray continuum emission?

Details Is the Galactic center annihilator 1E 1740.7-2942 a source of MeV Gamma-ray continuum emission? Is the Galactic center annihilator 1E 1740.7-2942 a source of MeV Gamma-ray continuum emission?

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...92..375l&link_type=abstract

The Astrophysical Journal Supplement Series, vol. 92, no. 2, p. 375-379

Astronomy and Astrophysics

Astronomy

3

Galactic Nuclei, Galactic Radiation, Gamma Ray Astronomy, Gamma Rays, Molecular Clouds, Positron Annihilation, Radio Jets (Astronomy), X Ray Sources, Bremsstrahlung, Interstellar Matter, Milky Way Galaxy, Synchrotron Radiation

Scientific paper

The remarkable soft gamma-ray source identified with the X-ray source 1E 1740.7-2942, which is the site of repeated outbursts of positron annihilation radiation, has been identified with a singular radio source consisting of a double-sided radio jet emanating from a compact core. The colliding point between the jet and the dense molecular cloud against which the source is projected could be the source of the variable narrow annihilation line emission observed from the Galactic center (GC) region for over a decade. The same region could be also a source of MeV gamma-ray continuum, since owing to their similar temporal evolution, the line emission is related to the MeV bump detected in this field for instance by HEAO 3 in 1979. Very recently, a MeV gamma-ray source was identified by COMPTEL at a position compatible with 1E 1740.7-2942. In this paper, we explore a consistent picture of this complex system, where the source of the MeV gamma-ray continuum is in fact the bremsstrahlung emission of the relativistic electrons which generate the synchrotron radio emission observed at the ends of the radio jet structure, i.e., the colliding point between the jet and the dense molecular cloud.

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