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Optical and near-infrared IFU spectroscopy of the nuclear region of the AGN-starburst galaxy NGC 7582

Texto completo
Ricci, T. V. [1] ; Steiner, J. E. [2] ; May, D. [3] ; Garcia-Rissmann, A. [3] ; Menezes, R. B. [2]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Fed Fronteira Sul, Campus Cerro Largo, BR-97900000 Chapeco, RS - Brazil
[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo - Brazil
[3] Lab Nacl Astrofis MCTI, Rua Estados Unidos 154, BR-37500000 Itajuba, MG - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 473, n. 4, p. 5334-5351, FEB 2018.
Citações Web of Science: 0

NGC 7582 is an SB(s) ab galaxy which displays evidences of simultaneous nuclear activity and star formation in its centre. Previous optical observations revealed, besides the H II regions, an ionization cone and a gas disc in its central part. Hubble Space Telescope (HST) images in both optical and infrared bands showthe active galactic nuclei (AGNs) and a fewcompact structures that are possibly associated with young stellar clusters. In order to study in detail both the AGN and evidence for star formation, we analyse optical (Gemini Multi-Object Spectrograph) and near-infrared (Spectrograph for Integral Field Observations in the Near Infrared) archival data cubes. We detected five nebulae with strong He II lambda 4686 emission in the same region where an outflow is detected in the {[}OIII] lambda 5007 kinematic map. We interpreted this result as clouds that are exposed to high-energy photons emerging from the AGN throughout the ionization cone. We also detected Wolf-Rayet features which are related to emission of one of the compact clusters seen in the HST image. Broad H alpha and Br gamma components are detected at the position of the nucleus. {[}Fe II] lambda 1.644 mu m, H2.2.122 mu m and Br gamma flux maps show two blobs, one north and the other south from the nucleus, that seem to be associated with five previously detected mid-infrared sources. Two of the five He II nebulae are partially ionized by photons from starbursts. However, we conclude that the main source of excitation of these blobs is the AGN jet/disc. The jet orientation indicates that the accretion disc is nearly orthogonal to the dusty torus. (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