EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 433/1 Article
Free access article

Issue A&A
Volume 433, Number 1, April I 2005
Page(s) 79 - 86
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20034537



A&A 433, 79-86 (2005)
DOI: 10.1051/0004-6361:20034537

Asymmetrical structure of ionization and kinematics in the Seyfert galaxy NGC 5033

E. Mediavilla1, A. Guijarro2, A. Castillo-Morales3, J. Jiménez-Vicente3, E. Florido3, S. Arribas4, B. García-Lorenzo1 and E. Battaner3

1  Instituto de Astrofísica de Canarias, Tenerife, Spain
    e-mail: emg@ll.iac.es
2  Centro Astronómico Hispano Alemán, Almería, Spain
    e-mail: aguijarr@urg.es
3  Dpto. Física Teórica y del Cosmos, Universidad de Granada, Spain
4  Space Telescope Science Institute, Baltimore, USA

(Received 18 October 2003 / Accepted 29 November 2004)

Abstract
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$\beta$ 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$\beta$ 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.


Key words: galaxies: active -- galaxies: individual: NGC 5033 -- galaxies: kinematics and dynamics -- galaxies: spiral -- galaxies: Seyfert -- galaxies: nuclei

SIMBAD Objects



© ESO 2005


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.