Dense Molecular Gas and Star Formation in Nearby Seyfert Galaxies

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dc.creatorKohno, K.
dc.creatorMatsushita, S.
dc.creatorVila-Vilaro, B.
dc.creatorOkumura, S. K.
dc.creatorShibatsuka, T.
dc.creatorOkiura, M.
dc.creatorIshizuki, S.
dc.creatorKawabe, R.
dc.date2002-06-23
dc.date.accessioned2026-07-07T02:04:02Z
dc.date.available2026-07-07T02:04:02Z
dc.descriptionAn imaging survey of CO(1-0), HCN(1-0), and HCO$^+$(1-0) lines in the centers of nearby Seyfert galaxies has been conducted using the Nobeyama Millimeter Array and the RAINBOW interferometer. Preliminary results reveal that 3 Seyferts out of 7 show abnormally high HCN/CO and HCN/HCO$^+$ ratios, which cannot occur even in nuclear starburst galaxies. We suggest that the enhanced HCN emission originated from X-ray irradiated dense obscuring tori, and that these molecular line ratios can be a new diagnostic tool to search for ``pure'' AGNs. According to our HCN diagram, we suggest that NGC 1068, NGC 1097, and NGC 5194 host ``pure'' AGNs, whereas Seyfert nuclei of NGC 3079, NGC 6764, and NGC 7469 may be ``composite'' in nature.
dc.description6 pages, 5 figures, in ASP Conf. Ser., 249, The Central kpc of Starbursts and AGN, 672, typo corrected
dc.identifierhttps://arxiv.org/abs/astro-ph/0206398
dc.identifierhttp://arxiv.org/abs/astro-ph/0206398
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/4601
dc.subjectAstrophysics
dc.titleDense Molecular Gas and Star Formation in Nearby Seyfert Galaxies
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