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VLT adaptive optics imaging of QSO host galaxies and close environment at z ~2.5: results from a pilot program

R. Falomo·J. K. Kotilainen·R. Scarpa·A. Treves
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Abstract

We report ESO-VLT near-infrared adaptive optics imaging of one radio-loud (PKS 0113-283) and two radio-quiet (Q 0045-3337 and Q 0101-337) QSOs at z > 2. In the first case, we are able to resolve the QSO and find that it is hosted by an elliptical of absolute magnitude M(K) = -27.6. For the other two objects, no extended emission has been unambiguously detected. This result, though restricted to a single object, extends up to z ~2.5 the finding that cosmic evolution of radio-loud QSO hosts follows the trend expected for luminous and massive spheroids undergoing passive evolution. For Q 0045-3337, our high resolution images show that it is located 1.2 arcsec from a K = 17.5 foreground disc galaxy, which may act as a gravitational lens, since the QSO most probably lies within the galaxy Einstein radius.

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R. Falomo, J. K. Kotilainen, R. Scarpa, A. Treves. 2004-12-15. VLT adaptive optics imaging of QSO host galaxies and close environment at z ~2.5: results from a pilot program. https://doi.org/10.1051/0004-6361%3A20041894

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