Blue colours of BL Lac host galaxies

Details Blue colours of BL Lac host galaxies Blue colours of BL Lac host galaxies

2004-04-20

arxiv.org/abs/astro-ph/0404372v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, to appear in the proceedings of "The Interplay among Black Holes, Stars and ISM in Galactic Nuclei", IAU 22

Scientific paper

10.1017/S1743921304003138

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.

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