Environments of QSOs at Redshifts 0.9 to 1.3 - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado




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Abstract: We analyse new deep g and i-band imaging with the CFHT of 16 QSOs in theredshift range 0.9 to 1.3. The principal points of interest are the symmetryand signs of tidal effects in the QSO hosts and nearby `companion- galaxies.The sample measures are compared with similar measures on randomly selectedfield galaxy samples. Asymmetry measures are made for all objects to g ~22, andmagnitudes of all galaxies 2 magnitudes fainter. The QSOs are found in denserenvironments than the field, and are somewhat offset from the centroid of theirsurrounding galaxies. The QSO hosts appear more disturbed than other galaxies.While the QSO companions and field galaxies have the same average asymmetry,the distribution of asymmetry values is different. QSO companions within 15arcsec are fainter than average field galaxies. We discuss scenarios that areconsistent with these and other measured quantities.



Autor: J. B. Hutchings, P. Scholz NRC-Hia, L. Bianchi JHU

Fuente: https://arxiv.org/







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