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Blue colours of BL Lac host galaxies

Published online by Cambridge University Press:  01 December 2004

J. K. Kotilainen  and
R. Falomo
J. K. Kotilainen
Affiliation:
Tuorla Observatory, University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
R. Falomo
Affiliation:
INAF – Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
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Abstract

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Near-infrared and optical imaging of BL Lac host galaxies is used to investigate their colour properties. We find that the R–H colour and colour gradient distributions of the BL Lac hosts are much wider than those for normal ellipticals, and many objects have very blue hosts and/or steep colour gradients. The blue colours are most likely caused by recent star formation. The lack of obvious signs of interaction may, however, require a significant time delay between the interaction event with associated star formation episodes and the onset of the nuclear activity.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
POSTERS
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS222 , March 2004 , pp. 527 - 528
Copyright
© 2004 International Astronomical Union