Bibcode
Mediavilla, E.; Guijarro, A.; Castillo-Morales, A.; Jiménez-Vicente, J.; Florido, E.; Arribas, S.; García-Lorenzo, B.; Battaner, E.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 433, Issue 1, April I 2005, pp.79-86
Fecha de publicación:
4
2005
Revista
Número de citas
14
Número de citas referidas
13
Descripción
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.