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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28384

Title: Star Formation in Collision Debris: Insights from the modeling of their Spectral Energy Distribution
Authors: Boquien, Mérédic
Duc, P.-A.
Galliano, F.
Braine, J.
Lisenfeld, Ute
Charmandaris, V.
Appleton, P. N.
Issue Date: 2010
Abstract: During galaxy-galaxy interactions, massive gas clouds can be injected into the intergalactic medium which in turn become gravitationally bound, collapse and form stars, star clusters or even dwarf galaxies. The objects resulting from this process are both "pristine", as they are forming their first generation of stars, and chemically evolved because the metallicity inherited from their parent galaxies is high. Such characteristics make them particularly interesting laboratories to study star formation. After having investigated their star-forming properties, we use photospheric, nebular and dust modeling to analyze here their spectral energy distribution (SED) from the far-ultraviolet to the mid-infrared regime for a sample of 7 star-forming regions. Our analysis confirms that the intergalactic star forming regions in Stephan's Quintet, around Arp 105, and NGC 5291, appear devoid of stellar populations older than 10^9 years. We also find an excess of light in the near-infrared regime (from 2 to 4.5 microns) which cannot be attributed to stellar photospheric or nebular contributions. This excess is correlated with the star formation rate intensity suggesting that it is probably due to emission by very small grains fluctuating in temperature as well as the polycyclic aromatic hydrocarbons (PAH) line at 3.3 micron. Comparing the attenuation via the Balmer decrement to the mid-infrared emission allows us to check the reliability of the attenuation estimate. It suggests the presence of embedded star forming regions in NGC 5291 and NGC 7252. Overall the SED of star-forming regions in collision debris (and Tidal Dwarf Galaxies) resemble more that of dusty star-forming regions in galactic disks than to that of typical star-forming dwarf galaxies.
Sponsorship: U.L. acknowledges financial support by the Spanish Science Ministry under grant AYA 2007-67625-C02-02 and by the Junta de Andalucía. V.C. acknowledges partial support from the EU ToK grant 39965 and FP7-REGPOT 206469.
Publisher: American Astronomical Society; Institute of Physics (IOP)
Keywords: Galaxies
Star formation
URI: http://hdl.handle.net/10481/28384
ISSN: 0004-6256
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Boquien, M.; et al. Star Formation in Collision Debris: Insights from the modeling of their Spectral Energy Distribution. Astronomical Journal, 140(6): 2124-2144 (2010). [http://hdl.handle.net/10481/28384]
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