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Paper: Millimeter Interferometric Observations of Nearby Luminous Infrared Galaxies
Volume: 373, The Central Engine of Active Galactic Nuclei
Page: 614
Authors: Imanishi, M.
Abstract: We present interferometric observations at 3 mm, using the Nobeyama Millimeter Array, of luminous infrared galaxies (LIRGs) with and without luminous buried AGN signatures in infrared spectra. Both HCN (J=10) and HCO+ (J=10) molecular lines are observed simultaneously. The HCN to HCO+ brightness temperature ratios toward the nuclei of these LIRGs are derived and are compared with those of galaxies known to be dominated by active galactic nuclei (AGNs) or starbursts. LIRGs with (without) luminous buried AGN signatures tend to distribute in the range occupied by AGN-dominated (starburst-dominated) galaxies, suggesting that this millimeter interferometric method is potentially an effective tool to find elusive buried AGNs, because dust extinction is negligible in this wavelength range.
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