2005A&A...433...79M -
Astronomy and Astrophysics, volume 433, 79-86 (2005/4-1)
Asymmetrical structure of ionization and kinematics in the Seyfert galaxy NGC 5033.
MEDIAVILLA E., GUIJARRO A., CASTILLO-MORALES A., JIMENEZ-VICENTE J., FLORIDO E., ARRIBAS S., GARCIA-LORENZO B. and BATTANER E.
Abstract (from CDS):
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 Hβ 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 Hβ 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 offcenter 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 offcentering 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.
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Journal keyword(s):
galaxies: active - galaxies: individual: NGC 5033 - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: Seyfert - galaxies: nuclei
Simbad objects:
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