A study of the unidentified gamma-ray source 3EG J1828+0142

COMBI, J. A.; ROMERO, G. E.; TORRES, D. F.; B. PUNSLY

Alicante, España

Workshop; Fourth INTEGRAL Workshop; 2000

We present a study of the radio environment of the gamma-ray source 3EG J1828+0142. This source presents a very high variability index in its gamma emission and a steep high-energy spectral index à ~ -2.8. Large-scale radio maps at different frequencies show the presence of a shell-type non-thermal structure when the diffuse emission from the Galactic disk is eliminated. At small scales, VLA radio images reveal the existence of several weak point sources within the 95% gamma-ray confidence location contour. Most of these sources present nonthermal spectral indices, but it is not clear whether they are extragalactic or not. We discuss the possibility of a scenario where the large structure is a SNR and one of the compact radio sources is an isolated black hole also produced in the original supernova explosion. The black hole could be responsible for the variable gamma-ray emission according to Punsly´s (1998) model. INTEGRAL observations with IBIS imager could detect the inverse Compton and blueshifted pair annihilation radiation from the relativistic electron-positron jets of the hole. Some estimates are presented in this regard.