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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A hot bubble at the centre of M81

Texto completo
Ricci, T. V. [1] ; Steiner, J. E. [1] ; Giansante, L. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 576, APR 2015.
Citações Web of Science: 1

Context. Messier 81 has the nearest active nucleus with broad H alpha emission. A detailed study of this galaxy's centre is important for understanding the innermost structure of the AGN phenomenon. Aims. Our goal is to seek previously undetected structures using additional techniques to reanalyse a data cube obtained with the GMOS-IFU installed on the Gemini North telescope (Schnorr Muller et al. 2011, MNRAS, 413, 149). Methods. We analysed the data cube using techniques of noise reduction, spatial deconvolution, starlight subtraction, PCA tomography, and comparison with HST images. Results. We identified a hot bubble with T > 43 500 K that is associated with strong emission of {[}N II] lambda 5755 angstrom and a high {[}O I] lambda 6300/H alpha ratio; the bubble displays a bluish continuum, surrounded by a thin shell of H alpha + {[}N II] emission. We also reinterpret the outflow found by Schnorr Muller et al. (2011), showing that the blueshifted cone nearly coincides with the radio jet, as expected. Conclusions. We interpret the hot bubble as having been caused by post starburst events that left one or more clusters of young stars, similar to the ones found at the centre of the Milky Way, such as the Arches and the IRS 16 clusters. Shocked structures from combined young stellar winds or supernova remnants are probably the cause of this hot gas and the low ionization emission. (AU)

Processo FAPESP: 12/21350-7 - Emissão de baixa ionização nuclear e circum-nuclear em galáxias massivas.
Beneficiário:Tiago Vecchi Ricci
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 11/20224-5 - Tomografia PCA e cinemática do núcleo da galáxia LINER M81
Beneficiário:Louise Maria Giansante Martins
Linha de fomento: Bolsas no Brasil - Iniciação Científica