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Nobeyama millimeter array observations of luminous infrared galaxies

EAS Publications Series, ISSN: 1633-4760, Vol: 31, Page: 93-96
2008
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Conference Paper Description

We present the results of systematic millimeter interferometric observations of luminous infrared galaxies (LIRGs), using the Nobeyama Millimeter Array. We observed HCN (J = 1-0) and HCO (J = 1-0) emission lines simultaneously, and derived their brightness-temperature ratios, to investigate whether the observed ratios are similar to those found in AGN-dominated nuclei or starburst galaxies. LIRGs with (without) luminous buried AGN signatures in our infrared spectra tend to show high (low) HCN (J = 1-0) to HCO (J = 1-0) brightness-temperature ratios as seen in galaxy nuclei dominated by AGNs (starbursts). The high ratios in buried AGN candidates could be explained by the enhanced HCN abundance, and/or infrared radiative pumping of the HCN molecule, in the close vicinity of an AGN. © 2008 EAS EDP Sciences.

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