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Title:
Dense Molecular Gas in Extreme Starburst Galaxies - What will we learn from Herschel?
Authors:
Greve, T. R.; Papadopoulos, P. P.; Gao, Y.; Radford, S. J. E.
Publication:
eprint arXiv:astro-ph/0609826
Publication Date:
09/2006
Origin:
ARXIV
Keywords:
Astrophysics
Comment:
4 pages, 1 figure; To appear in "Studying Galaxy Evolution with Spitzer and Herschel", conference held in Crete, Greece, May 2006. CUP conference series eds. V.Charmandaris, D.Rigopoulou, and N.D. Kylafis
Bibliographic Code:
2006astro.ph..9826G

Abstract

Ultra Luminous Infra-Red Galaxies (ULIRGs) -- gas-rich mergers harboring the most extreme star-forming conditions encountered in the local Universe -- are thought to re-enact the galaxy formation processes we are only barely able to glimpse in the distant Universe. Combining new single-dish molecular line observations of 12CO, 13CO, HCO+, HCN, and CS towards the two ULIRGs Arp220 and NGC6240 with existing data in the literature, we have compiled the most extensive molecular line data-sets to date of such galaxies. The data allow us to put strong constraints on the properties of the dense star forming gas in these two systems, and compare the relative usefulness of CS, HCN and HCO+ as tracers of dense gas. In addition, we have build molecular line templates based on our observations, and demonstrate that Herschel/HI-FI will be able to detect the high-J transitions of most of the above molecules in a large sample of ULIRGs out to z<=0.5, assuming Arp220 and NGC6240 are representative of the ULIRG population at these redshifts.
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