Detection of a double-peaked H alpha component from the accretion disc of NGC 4958

Autor(es)

Ricci, T. V. ^[1] ; Steiner, J. E. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Fronteira Sul, BR-97900000 Cerro Largo, RS - Brazil

^[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 486, n. 1, p. 1138-1145, JUN 2019.
• Citações Web of Science: 0

Resumo

Active Galactic Nuclei are objects associated with the presence of an accretion disc around supermassive black holes found in the very central region of galaxies with awell-defined bulge. In the optical range of the spectrum, a possible signature of the accretion disc is the presence of a broad double-peaked component that is mostly seen in H alpha. In this paper, we report the detection of a double-peaked feature in the Ha line in the nucleus of the galaxy NGC 4958. The narrow-line region of this object has an emission that is typical of a low-ionization nuclear emission-line region galaxy, which is the usual classification for double-peaked emitters. A central broad component, related to the broad-line region of this object, is seen in H alpha and also in H beta. We concluded that the double-peaked emission is emitted by a circular relativistic Keplerian disc with an inner radius xi(i) = 570 +/- 83, an outer radius xi(o) = 860 +/- 170 (both in units of GM(SMBH/c)(2)), an inclination to the line of sight i = 27.2 +/- 0.7 degrees and a local broadening parameter sigma = 1310 +/- 70 km s(-1). (AU)

• Processo FAPESP: 09/54006-4 - Um cluster de computadores para o Departamento de Astronomia do IAG-USP e para o Núcleo de Astrofísica da UNICSUL
• Beneficiário: Elisabete Maria de Gouveia Dal Pino
• Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 11/51680-6 - Explorando o universo: da formação de galáxias aos planetas tipo-terra, com o Telescópio Gigante Magellan
• Beneficiário: João Evangelista Steiner
• Linha de fomento: Auxílio à Pesquisa - Projetos Especiais