Evolution of Quasar Host Galaxies |
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Authors: | Renato Falomo |
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Institution: | (1) INAF, Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy |
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Abstract: | Near-IR images, obtained at the ESO-VLT during excellent seeing conditions, of a sample of 17 radio-loud and radio-quiet quasars
in the redshift range 1 < z < 2 are presented. The host galaxies of both types of quasars appear to follow the expected trend in luminosity of massive
ellipticals undergoing simple passive evolution. We find a systematic difference by a factor ∼2 in the host luminosity between
RLQs and RQQs that does not change significantly from z = 2 to the present epoch. Quasar hosts appear thus to be already well formed at z ∼ 2 and similar to massive inactive spheroids. These findings are in disagreement with the predictions of models for the
joint formation and evolution of galaxies and active nuclei based on the hierarchical structure formation scenario. |
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Keywords: | galaxies: active infrared: galaxies quasars: general galaxies: evolution |
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