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Date and Time of the Query: 2019-06-20 T10:14:39 PDT
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For refcode 1999AJ....117.1109H:
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1999AJ....117.1109H QSO HOSTS AND ENVIRONMENTS AT z = 0.9-4.2: JHK IMAGES WITH ADAPTIVE OPTICS J. B. HUTCHINGS, DAVID CRAMPTON, S. L. MORRIS, AND D. DURAND Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 West Saanich Road, Victoria, BC V8X 4M6, Canada AND E. STEINBRING Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6, Canada Received 1998 October 15; accepted 1998 November 20 ABSTRACT We have observed nine QSOs with redshifts of 0.85 to 4.16 at near-infrared wavelengths with PUEO, the Adaptive Optics (AO) Bonnette of the Canada- France-Hawaii Telescope. Exposure times ranged from 1500 to 24,000 s (mostly near 7000 s) in the J, H, and/or K bands with pixels 0.035" on the sky. The FWHMs of the co-added images at the location of the quasars are typically 0.16". Including another QSO published previously, we find associated QSO structure in at least eight of 10 objects, including the QSO at z = 4.16. The structures seen in all cases include long, faint features that appear to be tidal tails. In four cases we have also resolved the QSO host galaxies, but we find them to be smooth and symmetric. Future point- spread function removal may expand this result. Of the nine objects (including one object previously reported) with more extended structure, five are radio-loud, and all but one of these appear to be in a dense, small group of compact galaxy companions. The radio-quiet objects do not occupy the same dense environments as seen in the near-infrared. In this small sample we do not find any apparent trends of these properties with redshift over the range 0.8 < z < 2.4. The colors of the host galaxies and companions are consistent with young stellar populations at the QSO redshift. Our observations suggest that AO observations in the visible region will exhibit luminous signatures of the substantial star formation activity that must be occurring. Key words: galaxies: interactions-instrumentation: adaptive optics - quasars: general
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