NOBEYAMA MILLIMETER INTERFEROMETRIC HCN(1-0) AND HCO{sup +}(1-0) OBSERVATIONS OF FURTHER LUMINOUS INFRARED GALAXIES
- National Astronomical Observatory, 2-21-1, Osawa, Mitaka, Tokyo 181-8588 (Japan)
- Nobeyama Radio Observatory, Minamimaki, Minamisaku, Nagano, 384-1305 (Japan)
We report the results of interferometric HCN(1-0) and HCO{sup +}(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{sup +}(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{sup +}(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{sup +}(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{sup +}(1-0) brightness-temperature ratio can be used to observationally separate AGN-important and starburst-dominant galaxy nuclei.
- OSTI ID:
- 21269281
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 137, Issue 3; Other Information: DOI: 10.1088/0004-6256/137/3/3581; Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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