X-ray spectral analysis of the microquasar 1E 1740.7-2942

SAAVEDRA, E. A; SOTOMAYOR CHECA, P.; VIEYRO, F. L.; ROMERO, G. E.

Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2021

We present the results of the study of the X-ray emission of the microquasar 1E1740.7-2942, known as ?theGreat Annihilator?. The observation was made on 14 May 2021 and had a duration of 44 ks. The temporal analysis shows alow variability behaviour around 12.57 ± 0.64 c/s. The spectral analysis indicates that a power-law model plus a blackbodyis sufficient to describe the spectrum. The power-law index (E−Γ) is Γ ≈ 1.8 and the associated blackbody temperature is≈ 0.3 keV.We propose an interpretation of the spectrum based on a relativistic jet and a hot corona, and infer the correspondingphysical parameters.