Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008asthe.101..202i&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 101, No. 4, p. 202 - 213 (2008)
Astronomy and Astrophysics
Astronomy
Galaxies, Blackholes
Scientific paper
The author reports on the results of five-years HCN(1-0) and HCO+(1-0) observations of luminous infrared galaxies (LIRGs), using the Nobeyama Millimeter Array and RAINBOW interferometer. He found that LIRGs with luminous buried AGN signatures from previous infrared spectroscopy tend to show high HCN(1-0)/HCO+(1-0) brightness-temperature ratios, as seen in AGN-dominated galaxy nuclei, while those which are suggested to be starburst-dominated tend to show low ratios, as found in starburst galaxies. The strong HCN(1-0) emission in luminous buried AGN candidates could be explained by the HCN abundance enhancement by X-rays from the AGN and/or infrared radiative pumping of HCN molecules by strong infrared emission from the AGN. Comparisons with detailed theoretical calculations, which realistically incorporate the clumpy structures of molecular gas, are definitely needed for the solid interpretation of the observational results.
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