Molecular gas in the 3-ringed Seyfert/Liner galaxy NGC 7217

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dc.creatorCombes, F.
dc.creatorGarcia-Burillo, S.
dc.creatorBoone, F.
dc.creatorHunt, L. K.
dc.creatorLeon, S.
dc.creatorEckart, A.
dc.creatorBaker, A. J.
dc.creatorTacconi, L. J.
dc.creatorEnglmaier, P.
dc.creatorSchinnerer, E.
dc.creatorNeri, R.
dc.date2002-09-13
dc.date.accessioned2026-07-07T02:05:09Z
dc.date.available2026-07-07T02:05:09Z
dc.descriptionWe present CO(1-0) and CO(2-1) maps of the Seyfert galaxy NGC 7217, obtained with the IRAM interferometer, at 3" and 1.5" resolution respectively. The nuclear ring (at r=12"=0.8kpc) is predominant in the CO maps, with a remarkable surface density gradient between the depleted region inside the ring and the inner border of the ring. The CO nuclear ring is significantly broader (500-600pc) than the dust lane ring. The CO(2-1)/CO(1-0) ratio is around 1, typical of optically thick gas with high density. The overall morphology of the ring is quite circular, with no evidence of non-circular velocities. In the CO(2-1) map, a central concentration might be associated with the circumnuclear ring of ionised gas detected inside r=3" and interpreted as a polar ring by Sil'chenko and Afanasiev (2000). Our interpretation is more in terms of a bar/spiral structure, in the same plane as the global galaxy but affected by non-circular motions, which results in a characteristic S-shape of the isovels. This nuclear bar/spiral structure, clearly seen in a V-I HST colour image, is essentially gaseous and might be explained with acoustic waves.
dc.description2 pages, 1 figure, Proceedings SF2A-2002, Paris, ed. F. Combes and D. Barret, EDP-Sciences
dc.identifierhttps://arxiv.org/abs/astro-ph/0209266
dc.identifierhttp://arxiv.org/abs/astro-ph/0209266
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5018
dc.subjectAstrophysics
dc.titleMolecular gas in the 3-ringed Seyfert/Liner galaxy NGC 7217
dc.typetext

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