IFU spectroscopy of 10 early-type galactic nuclei - II. Nuclear emission line properties

Autor(es)

Ricci, T. V. ^[1] ; Steiner, J. E. ^[1] ; Menezes, R. B. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 440, n. 3, p. 2442-2456, MAY 2014.
• Citações Web of Science: 12

Resumo

Although it is well known that massive galaxies have central black holes, most of them accreting at low Eddington ratios, many important questions still remain open. Among them are the nature of the ionizing source, the characteristics and frequencies of the broad-line region and of the dusty torus. We report observations of 10 early-type galactic nuclei, observed with the Gemini Multi Object Spectrograph in integral field unit mode, installed on the Gemini South telescope, analysed with standard techniques for spectral treatment and compared with results obtained with principal component analysis Tomography (Paper I). We performed spectral synthesis of each spaxel of the data cubes and subtracted the stellar component from the original cube, leaving a data cube with emission lines only. The emission lines were decomposed in multi-Gaussian components. We show here that, for eight galaxies previously known to have emission lines, the narrow-line region can be decomposed in two components with distinct line widths. In addition to this, broad H alpha emission was detected in six galaxies. The two galaxies not previously known to have emission lines show weak H alpha+{[}N ii] lines. All 10 galaxies may be classified as low-ionization nuclear emission regions in diagnostic diagrams and seven of them have bona fide active galactic nuclei with luminosities between 10(40) and 10(43) erg s(-1). Eddington ratios are always < 10(-3). (AU)

• Processo FAPESP: 12/21350-7 - Emissão de baixa ionização nuclear e circum-nuclear em galáxias massivas.
• Beneficiário: Tiago Vecchi Ricci
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 08/06988-0 - Caracterização e ambiente de núcleos ativos de baixa luminosidade
• Beneficiário: Tiago Vecchi Ricci
• Modalidade de apoio: Bolsas no Brasil - Doutorado