Broadband X-ray analysis of 1E1740.7-2942: constraints on spin, inclination, and a tentative black hole mass

Autor(es)

Stecchini, Paulo E. ^[1] ; D'Amico, F. ^[1] ; Jablonski, F. ^[1] ; Castro, M. ^[2] ; Braga, J. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais, Av Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Estadual Campinas, Cidade Univ Zeferino Vaz, BR-13083853 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 493, n. 2, p. 2694-2705, APR 2020.
• Citações Web of Science: 0

Resumo

1E 1740.7-2942 is one of the strongest hard X-ray emitters in the Galactic Centre region, believed to be a black hole in a high-mass X-ray binary system. Although extensively studied in X-rays, many aspects about the underlying nature of the system are still unknown. For example, X-ray data analyses of 1E1740.7-2942 to date have not yet unveiled the signature of a reflection component, whose modelling could be used to estimate parameters such as the spin of the black hole and inclination of the disc. We report here on the determination of these parameters from the analysis of the reflection component present in a public NuSTAR observation which has not been subject to any previous study. We include XMM-Newton and INTEGRAL data to build a combined spectrum, enabling a joint analysis of both the disc and comptonization components. Results point to a relatively high inclination disc greater than or similar to 50 degrees (3 a) and a near-maximum speed rotating black hole. The former is in agreement with a previous radio study and the latter is reported here for the first time. Lastly, we follow the methodology of recent efforts to weigh black holes with only X-ray spectra and find results that suggest a black hole mass of about 5 M-circle dot for 1E 1740.7-2942. (AU)

• Processo FAPESP: 15/25972-0 - Desenvolvimento e Caracterização do Sistema de Detectores do Experimento MIRAX
• Beneficiário: Manuel Antonio Castro Ávila
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/13551-6 - Desenvolvimento do sistema imageador do experimento protoMIRAX e determinação de parâmetros dinâmicos do candidato a buraco negro 1E1740.7-2942 através da linha K alfa do ferro
• Beneficiário: Paulo Eduardo Freire Stecchini
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/26258-4 - Matéria superdensa no universo
• Beneficiário: Manuel Máximo Bastos Malheiro de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Temático