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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28393

Title: Molecular gas in Tidal Dwarf Galaxies: exploring the conditions for star formation
Authors: Lisenfeld, Ute
Bournaud, F.
Brinks, E.
Duc, P.-A.
Issue Date: 2009
Abstract: Tidal Dwarf Galaxies (TDGs), produced from material expelled in galactic interactions, are well--suited to test the laws of star formation (SF) due to their simple structure, high metallicity -- making CO a reliable tracer of the molecular gas content -- and recent SF. Here, we study the conditions for the onset of SF and for the rate at which SF proceeds once above a threshold in a small sample of TDGs. We use data for the gas (atomic and molecular) surface density and SF rate per area to test the laws of SF found for spiral and dwarf galaxies in this more extreme environment. We find in general a good agreement with the Schmidt law found for the total gas and for the molecular gas but note that higher resolution CO observations are necessary to clarify some possible discrepancies. We find, down to a scale of $\sim$1 kpc, in general a good agreement between the peaks of SF and of the molecular gas, but also find in some objects surprisingly large quantities of molecular gas at places where no SF is occuring. A high column density of molecular gas is therefore not a sufficient condition for the onset of SF. We find that the kinematical properties of the gas are also relevant: in two objects our observations showed that SF only occured in regions with a narrow line width.
Sponsorship: This work has been supported by the Spanish Ministry of Science via the research grants AYA 2005-07516-C02-01 and ESP 2004-06870-C02-02 and by the Junta de Andalucía.
Publisher: Academia Ortodox de Creta
Keywords: Tidal Dwarf Galaxies (TDGs)
Star formation
Atomic gas
Molecular gas
URI: http://hdl.handle.net/10481/28393
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Lisenfeld, U.; et al. Molecular gas in Tidal Dwarf Galaxies: exploring the conditions for star formation. In: Proceedings of "Star-forming Dwarf Galaxies: Ariadne's Thread in the Cosmic Labyrinth", Crete (Greek), 2008. [http://hdl.handle.net/10481/28393]
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