Astron. J., 137, 3581-3598 (2009/March-0)
Nobeyama millimeter interferometric HCN(1-0) and HCO+(1-0) observations of further luminous infrared galaxies.
IMANISHI M., NAKANISHI K., TAMURA Y. and PENG C.-H.
Abstract (from CDS):
We report the results of interferometric HCN(1-0) and HCO+(1-0) observations of four luminous infrared galaxies (LIRGs), NGC 2623, Mrk 266, Arp 193, and NGC 1377, as a final sample of our systematic survey using the Nobeyama Millimeter Array. Our survey contains the most systematic interferometric, spatially resolved, simultaneous HCN(1-0) and HCO+(1-0) observations of LIRGs. Ground-based infrared spectra of these LIRGs are also presented to elucidate the nature of the energy sources at the nuclei. We derive the HCN(1-0)/HCO+(1-0) brightness-temperature ratios of these LIRGs and confirm the previously discovered trend that LIRG nuclei with luminous buried active galactic nucleus (AGN) signatures in infrared spectra tend to show high HCN(1-0)/HCO+(1-0) brightness-temperature ratios, as seen in AGNs, while starburst-classified LIRG nuclei in infrared spectra display small ratios, as observed in starburst-dominated galaxies. Our new results further support the argument that the HCN(1-0)/HCO+(1-0) brightness-temperature ratio can be used to observationally separate AGN-important and starburst-dominant galaxy nuclei.
galaxies: active - galaxies: individual (NGC 2623, Mrk 266, Arp 193, NGC 1377) - galaxies: ISM - galaxies: nuclei - radio lines: galaxies
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