Evolution of BL Lac host galaxies

Details Evolution of BL Lac host galaxies Evolution of BL Lac host galaxies

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..222..521h&link_type=abstract

The Interplay among Black Holes, Stars and ISM in Galactic Nuclei, Proceedings of IAU Symposium, No. 222. Edited by T. Storchi-B

Computer Science

1

Scientific paper

Deep, high-resolution I-band images of 24 BL Lac objects between z = 0.3 and 1.3 taken with the NOT and the ESO-NTT and VLT telescopes are discussed. In 17/24 (71%) of the BL Lac objects, we detected an underlying nebulosity, in 11/17 the host of the BL Lac in the redshift range z = 0.3-1 (< z > = 0.6). The host galaxies are luminous (MI = -25.2±0.8) and large (re = 10.5±7 kpc). They are on average about 0.6 mag brighter than BL Lac host galaxies at z ˜ 0.3 indicative of evolution, whereas their half-light radii are similar. By combining our data with literature data at low-redshift and applying evolutionary models to them, we find that the properties of the host galaxies of BL Lac objects up to z ˜ 1 are compatible with passively evolving elliptical galaxies formed at a redshift of z ≥ 2. Host galaxies of low-luminosity radio-loud AGN (BL Lac/FR I) have very similar properties to the hosts of radio-quiet QSOs and high-luminosity radio-loud AGN (radio-loud QSO/FR II) over a wide redshift range. This supports the picture of the `Grand Unification', in which AGN activity is a transient phenomenon in galaxy evolution.

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