The nuclear region of NGC 613-I. Multiwavelength analysis

Autor(es)

da Silva, Patricia ^[1] ; Menezes, R. B. ^[2] ; Steiner, J. E. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, BR-05508090 Sao Paulo, SP - Brazil

^[2] Inst Maua Tecnol, Praca Maua 1, BR-09580900 Sao Caetano do Sul, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 492, n. 4, p. 5121-5140, MAR 2020.
• Citações Web of Science: 0

Resumo

In this paper, we report a detailed study with a variety of data from optical, near-infrared, X-ray, and radio telescopes of the nuclear region of the galaxy NGC 613 with aim of understanding its complexity. We detected an extended stellar emission in the nucleus that, at first, appears to be, in the optical hand, two stellar nuclei separated by a stream of dust. The active galactic nucleus (AGN) is identified as a variable point-like source between these two stellar components. There is a central hard X-ray emission and an extended soft X-ray emission that closely coincides with the ionization cone, as seen in the {[}O III]lambda 5007 emission. The centroid of the {[}OI]lambda 6300 emission does not coincide with the AGN, being shifted by 0.24 arcsec towards the ionization cone; this shift is probably caused by a combination of differential dust extinction together with emission and reflection in the ionization cone. The optical spectra extracted from the central region are typical of low -ionization nuclear emission line regions. We also identify 10 1-1Hregions, eight of them in a star -forming ring that is visible in Br gamma, {[}Fe II]lambda 16436, and molecular CO(3-2) images observed in previous studies. Such a ring also presents weak hard X-ray emission, probably associated with supernova remnants, not detected in other studies. The position of the AGN coincides with the centre of a nuclear spiral (detected in previous works) that brings gas and dust from the bar to the nucleus, causing the high extinction in this area. (AU)

• 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