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oai:docta.ucm.es:20.500.14352/514022024-09-02T13:57:24Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Mediavilla, E. author Guijarro, A. author Castillo Morales, María África author Jiménez Vicente, J. author Florido, E. author Arribas, S. author García Lorenzo, B. author Battaner, E. author 2005-04 We present integral field spectroscopy of NGC 5033, a low luminosity Seyfert galaxy. The observations were made with INTEGRAL, a fiber based system operating at the WHT. The intensity map of the H emission line represents a spiral or ring-like pattern of HII regions. On the contrary, the [OIII] intensity map morphology is markedly anisotropic. The strong morphological differences imply that the [ OIII] emitters represent highly ionized gas illuminated by the central source. The [ OIII] map morphology is compatible with a biconical structure of ionization induced by strong extinction in the galaxy disc that also obscures half of the spheroidal stellar bulge. We identify the spectrum corresponding to the Seyfert 1 nucleus from the presence of H broad emission lines. This spectrum is located in a region where strong extinction is expected but exhibits the bluest spectral energy distribution. The Seyfert 1 nucleus seems to be off center with respect to the stellar rotation center. This result has been also found in other Seyfert galaxies and interpreted in terms of a past merger. The off centering could indicate the presence of nonsymmetric departures in the gravitational potential which could be fueling the active nucleus. The kinematics of the [ OIII] emitters show important deviations at a kpc scale with respect to the stellar velocity field and show features related to the asymmetrical morphology of the high ionization region. 0004-6361 10.1051/0004-6361:20034537 https://hdl.handle.net/20.500.14352/51402 http://dx.doi.org/10.1051/0004-6361:20034537 http://www.aanda.org/ Asymmetrical structure of ionization and kinematics in the Seyfert galaxy NGC 5033