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arXiv 1011.0993astro-ph.CO
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放大镜下z = 0.6的致密早型星系:由内向外生长的证据

A Compact Early-type Galaxy at z = 0.6 Under a Magnifying Lens: Evidence For Inside-out Growth

M. W. Auger, T. Treu, B. J. Brewer, P. J. Marshall

摘要:

利用Keck激光导星自适应光学成像技术,利用强引力透镜(有效分辨率为FWHM ~ 200 pc)的放大效应,研究了中红移(z = 0.63)质量早型星系被前景早型星系透镜作用后的亚kpc尺度,我们称这类强引力透镜系统为EEL,例如,早期类型/早期类型镜片。我们发现,背景源是巨大的(M* = 10^{10.9} M_sun)和紧凑的(r_e = 1.1 kpc),和一个两个组件的拟合需要精确地模拟表面亮度分布,包括扩展的低表面亮度分量。这种扩展的成分可能来自于更高红移的“红块”的演化,或者可能已经在z ~ 2处,但由于宇宙学表面亮度变暗而无法观察到。

英文摘要:

We use Keck laser guide star adaptive optics imaging and exploit the magnifying effects of strong gravitational lensing (the effective resolution is FWHM ~ 200 pc) to investigate the sub-kpc scale of an intermediate-redshift (z = 0.63) massive early-type galaxy being lensed by a foreground early-type galaxy; we dub this class of strong gravitational lens systems EELs, e.g., early-type/early-type lenses. We find that the background source is massive (M* = 10^{10.9} M_sun) and compact (r_e = 1.1 kpc), and a two-component fit is required to model accurately the surface brightness distribution, including an extended low-surface-brightness component. This extended component may arise from the evolution of higher-redshift `red nuggets' or may already be in place at z ~ 2 but is unobservable due to cosmological surface brightness dimming.

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