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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709895.0, MPI für Astronomie / Publikationen_mpia
The circumnuclear environment of NGC 613: a nuclear starburst caught in the act?
Authors:Falcón-Barroso, J.; Ramos Almeida, C.; Böker, T.; Schinnerer, E.; Knapen, J. H.; Lançon, A.; Ryder, S.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:329
End Page:340
Audience:Not Specified
Abstract / Description:We present near-infrared (H- and K-band) integral-field observations of the inner ˜700 pc of the active spiral galaxy NGC 613, obtained with SINFONI on the Very Large Telescope. We use emission-line ratios to determine the dominant excitation mechanisms in different regions within our field of view, in particular, the active nucleus and the star-forming circumnuclear ring. Diagnostic diagrams involving [Fe II] and H2 fluxes indicate that the gas is not only photoionized by the active galactic nucleus (AGN) in the nucleus of NGC 613, but also shock heated. On the other hand, the emission-line ratios measured in the `hotspots' along the ring are fully consistent with them being young star-forming regions. We find no sign of radial gas transport from the ring into the core region dominated by the AGN. The ring morphology appears disturbed by a radial outflow of material from the AGN, which is confirmed by the existence of a weak jet in archival radio maps. However, this jet does not seem to have any significant effect on the morphology of the large (˜8 × 107 M&sun;) reservoir of molecular gas that has accumulated inside the central ˜100 pc. Such a concentration of molecular gas around an AGN is unusual, and supports a scenario in which star formation is recurrent and episodic in spiral galaxies. In this context, NGC 613 appears to be in final stages of the gas accumulation phase and is likely to undergo a nuclear starburst in the near future.
Free Keywords:galaxies: active; galaxies: individual: NGC 613; galaxies: ISM; galaxies: nuclei
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stt2189
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