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LUMINOUS QUASARS IN LUMINOUS EARLY-TYPE HOST GALAXIES

机译:发光早期型星系中的发光类

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Some recent observations of nearby quasars with Hubble Space Telescope (HST) have apparently failed to detect host galaxies. We review the HST observations as well as near-infrared ground-based observations of the same objects. We find that the quasar hosts can be detected in the HST data if they are smoothed sufficiently to reveal low surface brightness. The smooth hosts are very difficult to detect with HST but are more easily visible in the deeper, ground-based IR images. The V - H colors obtained by combining the HST and IR data are compatible with normal galaxy colors at the redshifts of the quasars. This behavior can be explained if the hosts are massive early-type galaxies. All together, HST images have been reported for 15 luminous quasars, ~13 of which have smooth early-type hosts. This kind of galaxy therefore appears to be the most common host for a luminous quasar.
机译:最近用哈勃太空望远镜(HST)对附近的类星体进行的一些观测显然未能检测到宿主星系。我们回顾了HST观测以及同一物体的近红外地面观测。我们发现,如果将类星体主机充分平滑以显示出较低的表面亮度,则可以在HST数据中检测到它们。使用HST很难检测到光滑的宿主,但是在更深的地面IR图像中更容易看到它们。通过组合HST和IR数据获得的V-H颜色与类星体红移处的正常星系颜色兼容。如果宿主是巨大的早期星系,则可以解释这种现象。总共报告了15个发光类星体的HST图像,其中约13个具有光滑的早期类型宿主。因此,这种星系似乎是发光类星体最常见的宿主。

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