NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T15:07:37 PDT
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For refcode 1994MNRAS.266..953K:
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Copyright by Royal Astronomical Society. 1994MNRAS.266..953K The host galaxies of Seyfert type 1 nuclei Jari K. Kotilainen and Martin J. Ward European Southern Observatory, Karl-Schwartschild-Str 2, D-8046, Garching, Germany Astrophysics, Nuclear Physics Building, Keble Road, Oxford OX1 3RH Accepted 1993 September 24. Received 1993 May 20; in original form 1993 March 4 ABSTRACT This paper is part of a series in which we study a hard-X-ray-selected sample of AGN, mainly optically classified as Seyfert 1 nuclei. In this paper, we use our optical and infrared imaging data of the sample to study the properties of the host galaxies. We separate the non-stellar and stellar components of the nuclear light, on the basis of the results from Papers I and III. The stellar colours in the nucleus are generally much redder in B - V and V - K indices than normal spiral galaxy bulges, and can be reproduced Using stellar evolution models modified by ~1 mag of reddening in A_v_ and/or reradiation from hot dust. The J - H colour is normal, but H - K is usually very red, indicating that the near- infrared (NIR) colours are affected by dust reradiation within the K band, either heated by the active nucleus or by young stars in H II regions associated with enhanced star formation around the nucleus. The NIR colours are similar to those observed in a sample of starburst/LINER galaxies. The B - V, V - K and J - K colours have red gradients towards the nucleus, although there is considerable scatter. The B - V and J - K colour gradients are not correlated, and are therefore likely to be caused by different mechanisms. The colour gradients are in good agreement with those seen in normal spiral galaxies. We present luminosity distributions of the host galaxies in B, V, J and K. There is a strong correlation between the AGN and the host galaxy luminosity, in the sense that the more powerful AGN reside in more luminous host galaxies. The luminosities of the host galaxies for our sample fall between those of normal spiral galaxies and the hosts of quasars. The central surface brightnesses and the length scales of the discs are not well determined from the decomposition fits, but on average they are consistent with values found in previous studies. Key words: galaxies: active - galaxies: nuclei - galaxies: photometry - galaxies: Seyfert - galaxies: stellar content - infrared: galaxies.
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