EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 453/3 Article
Free access article

Issue A&A
Volume 453, Number 3, July III 2006
Page(s) 863 - 868
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20054664



A&A 453, 863-868 (2006)
DOI: 10.1051/0004-6361:20054664

The K-band properties of Seyfert 2 galaxies

Z. Peng1, Q. Gu1, J. Melnick2 and Y. Zhao1

1  Department of Astronomy, Nanjing University, Nanjing 210093, PR China
    e-mail: [qsgu;yhzhao]@nju.edu.cn
2  European Southern Observatory, Alonso de Cordova 3107, Santiago, Chile
    e-mail: jmelnick@eso.org

(Received 8 December 2005 / Accepted 15 March 2006)

Abstract
Aims. It is well known that the [O III]$\lambda$5007 emission line and hard X-ray (2-10 keV) luminosities are good indicators of AGN activities and that the near and mid-infrared emission of AGN originates from re-radiation of dusty clouds heated by the UV/optical radiation from the accretion disk. In this paper we present a study of the near-infrared K-band (2.2 $\mu$m) properties for a sample of 65 Seyfert 2 galaxies.
Methods.By using the AGN/Bulge/Disk decomposition technique, we analyzed the 2MASS $K_{\rm S}$-band images for Seyfert 2 galaxies in order to derive the $K_{\rm S}$-band magnitudes for the central engine, bulge, and disk components.
Results.We find that the $K_{\rm S}$-band magnitudes of the central AGN component in Seyfert 2 galaxies are tightly correlated with the [O III]$\lambda$5007 and the hard X-ray luminosities, which suggests that the AGN K-band emission is also an excellent indicator of the nuclear activities at least for Seyfert 2 galaxies. We also confirm the good relation between the central black hole masses and bulge's K-band magnitudes for Seyfert 2s.


Key words: galaxies: active -- galaxies: Seyfert -- infrared: galaxies -- methods: statistical



© ESO 2006


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.