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

Abstract

view Abstract Citations (3) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Is the Galactic Center Annihilator 1E 1740.7-2942 a Source of MeV Gamma-Ray Continuum Emission? Laurent, Philippe ; Paul, Jacques Abstract 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. Publication: The Astrophysical Journal Supplement Series Pub Date: June 1994 DOI: 10.1086/191981 Bibcode: 1994ApJS...92..375L Keywords: 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; Astronomy; GALAXY: CENTER; GAMMA RAYS: OBSERVATIONS; ISM: JETS AND OUTFLOWS; ISM: MOLECULES; X-RAYS: ISM full text sources ADS | data products SIMBAD (4) HEASARC (1)