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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693662.0, MPI für Astronomie / Publikationen_mpia
Constrained simulations of the Antennae galaxies: comparison with Herschel-PACS observations
Authors:Karl, S. J.; Lunttila, T.; Naab, T.; Johansson, P. H.; Klaas, U.; Juvela, M.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:696
End Page:709
Audience:Not Specified
Abstract / Description:We present a set of hydro-dynamical numerical simulations of the Antennae galaxies in order to understand the origin of the central overlap starburst. Our dynamical model provides a good match to the observed nuclear and overlap star formation, especially when using a range of rather inefficient stellar feedback efficiencies (0.01 ≲ qEoS ≲ 0.1). In this case a simple conversion of local star formation to molecular hydrogen surface density motivated by observations accounts well for the observed distribution of CO. Using radiative transfer post-processing we model synthetic far-infrared spectral energy distributions (SEDs) and two-dimensional emission maps for direct comparison with Herschel-PACS observations. For a gas-to-dust ratio of 62:1 and the best matching range of stellar feedback efficiencies the synthetic far-infrared SEDs of the central star-forming region peak at values of ˜65-81 Jy at 99-116 μm, similar to a three-component modified blackbody fit to infrared observations. Also the spatial distribution of the far-infrared emission at 70 μm, 100 μm and 160 μm compares well with the observations: ≳50 per cent (≳35 per cent) of the emission in each band is concentrated in the overlap region while only <30 per cent (<15 per cent) is distributed to the combined emission from the two galactic nuclei in the simulations (observations). As a proof of principle we show that parameter variations in the feedback model result in unambiguous changes both in the global and in the spatially resolved observable far-infrared properties of Antennae galaxy models. Our results strengthen the importance of direct, spatially resolved comparative studies of matched galaxy merger simulations as a valuable tool to constrain the fundamental star formation and feedback physics.
Free Keywords:methods: numerical; galaxies: evolution; galaxies: individual: NGC 4038/4039; galaxies: interactions; galaxies: starburst
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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