Molecular hydrogen and [Fe II] in active galactic nuclei - III. Low-ionization nuclear emission-line region and star-forming galaxies

Autor(es)

Riffel, R. ^[1] ; Rodriguez-Ardila, A. ^[2] ; Aleman, I. ^[1] ; Brotherton, M. S. ^[3] ; Pastoriza, M. G. ^[1] ; Bonatto, C. ^[1] ; Dors, Jr., O. L. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio Grande do Sul, Dept Astron, Porto Alegre, RS - Brazil

^[2] Lab Nacl Astrofis MCTI, BR-37504364 Itajuba, MG - Brazil

^[3] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 - USA

^[4] Univ Vale do Praiba, BR-12244000 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 430, n. 3, p. 2002-2017, APR 2013.
• Citações Web of Science: 39

Resumo

We study the kinematics and excitation mechanisms of H-2 and {[}Fe II] lines in a sample of 67 emission-line galaxies with Infrared Telescope Facility SpeX near-infrared (0.8-2.4 mu m) spectroscopy together with new photoionization models. H-2 emission lines are systematically narrower than narrow-line region lines, suggesting that the two are, very likely, kinematically disconnected. The new models and emission-line ratios show that the thermal excitation plays an important role not only in active galactic nuclei but also in star-forming galaxies. The importance of the thermal excitation in star-forming galaxies may be associated with the presence of supernova remnants close to the region emitting H-2 lines. This hypothesis is further supported by the similarity between vibrational and rotational temperatures of H-2. We confirm that the diagram involving the line ratios H-2 2.121 mu m/Br gamma and {[}Fe II] 1.257 mu m/Pa beta is an efficient tool for separating emission-line objects according to their dominant types of activities. We suggest new limits to the line ratios in order to discriminate between the different types of nuclear activities. (AU)

• Processo FAPESP: 07/04498-2 - Emissão de H2 em núcleos ativos de galáxias
• Beneficiário: Isabel Regina Guerra Aleman
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 09/14787-7 - Propriedades físicas de regiões de formação estelar em anéis circumnucleares e em (U)LIRGs
• Beneficiário: Oli Luiz Dors Junior
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores