Ground-based high spatial resolution (FWHM 0.46). In all cases, the host galaxies of the QSOs were detected, and most have discernible two-dimensional structure. The QSO host galaxies and the QSO nuclei are similar in magnitude at H band. H-band luminosities of the hosts range from 0.5–7.5 L*, with a mean of 2.3 L*, and are consistent with those found in ultraluminous infrared galaxies. Both the QSO nuclei and the host galaxies have near-infrared excesses, which may be the result of dust associated with the nucleus and of recent dusty star formation in the host. These results suggest that some, but not all, optically selected QSOs may have evolved from an infrared active state triggered by the merger of two similarly sized L* galaxies, in a manner similar to that of the ultraluminous infrared galaxies.
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机译：地面高空间分辨率（FWHM 0.46）。在所有情况下，都检测到了QSO的宿主星系，并且大多数具有可辨别的二维结构。 QSO宿主星系和QSO核在H波段的大小相似。宿主的H波段光度范围为0.5–7.5 L *，平均为2.3 L *，与超发光红外星系中的H波段光度一致。 QSO核和宿主星系都具有近红外过量，这可能是与核相关的粉尘和最近在宿主中形成尘埃星的结果。这些结果表明，部分但不是全部光学选择的QSO可能已经由两个相似大小的L *星系合并引发的红外活跃状态演化而来，其方式类似于超发光红外星系。
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