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

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

Buenos Aires

Congreso; Reunion 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, knownas ”the Great Annihilator”. The observation was made on 14 May 2021 and had a duration of 44 ks. Thetemporal analysis shows a low variability behaviour around 12.57 ± 0.64 c/s. The spectral analysis indicatesthat a power-law model plus a blackbody is sufficient to describe the spectrum. The power-law index (E−Γ) isΓ ≈ 1.8 and the associated blackbody temperature is ≈ 0.3 keV. We propose an interpretation of the spectrumbased on a relativistic jet and a hot corona, and infer the corresponding physical parameters.