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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28392

Title: Collisional debris as laboratories to study star formation
Authors: Boquien, Mérédic
Duc, P.-A.
Wu, Y.
Charmandaris, V.
Lisenfeld, Ute
Braine, J.
Brinks, E.
Iglesias-Páramo, J.
Xu, C. K.
Issue Date: 2009
Abstract: In this paper we address the question whether star formation is driven by local processes or the large scale environment. To do so, we investigate star formation in collisional debris where the gravitational potential well and velocity gradients are shallower and compare our results with previous work on star formation in non-interacting spiral and dwarf galaxies. We have performed multiwavelength spectroscopic and imaging observations (from the far-ultraviolet to the mid-infrared) of 6 interacting systems, identifying a total of 60 star-forming regions in their collision debris. Our analysis indicates that in these regions a) the emission of the dust is at the expected level for their luminosity and metallicity, b) the usual tracers of star formation rate display the typical trend and scatter found in classical star forming regions, and c) the extinction and metallicity are not the main parameters governing the scatter in the properties of intergalactic star forming regions; age effects and variations in the number of stellar populations, seem to play an important role. Our work suggests that local properties such as column density and dust content, rather than the large scale environment seem to drive star formation. This means that intergalactic star forming regions can be used as a reliable tool to study star formation.
Sponsorship: M.B. acknowledges support by NASA-ADP grant NNX07AN90G and D. Calzetti for fruitful discussions. U.L. acknowledges financial support by the Spanish Science Ministry under grant AYA2007-67625-C02-02 and by the Junta de Andalucía. V.C. would like to acknowledge partial support from EU ToK grant 39965.
Publisher: American Astronomical Society; Institute of Physics (IOP)
Keywords: Galaxies
Star formation
URI: http://hdl.handle.net/10481/28392
ISSN: 0004-637X
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Boquien, M.; et al. Collisional debris as laboratories to study star formation. Astronomical Journal, 137(6): 4561-4576 (2009). [http://hdl.handle.net/10481/28392]
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