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Galaxy-Galaxy Lensing Studies from COMBO-17

机译:来自Combo-17的Galaxy-Galaxy镜头研究

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We study the dark matter halos of galaxies with galaxy-galaxy lensing using the COMBO-17 survey This survey offers an unprecedented data set for studying lens galaxies at z - 0,2 - 0.7 including redshift information and spectral classification from 17 optical filters for objects brighter than R = 24, So far, redshifts and classification for the lens galaxies have mainly been available for local surveys like the Sloan Digital Sky Survey (SDSS) Further, redshifts for the source galaxies have typically not been available at all but had to be estimated from redshift probability distribution which - for faint surveys - even had to be extrapolated.To study the dark matter halos we parametrize the lens galaxies as singular isothermal spheres (SIS) or by Navarro-Frenk-White (NFW) profiles In both cases we find a dependence of the velocity dispersion or virial radius, respectively, on lens luminosity and colour. For the SIS model, we are able to reproduce the Tully-Fisher/Faber-Jackson relation on a scale of ldOh'1 kpc For the NFW profile we also calculate virial masses, mass-to-light ratios and rotation velocities.Finally, we investigate differences between the three survey fields used here
机译:我们使用Combo-17调查研究Galaxy-Galaxy镜头的星系的暗物质晕,这项调查提供了一个前所未有的数据集,用于在Z - 0.2 - 0.7处学习透镜星系,包括来自17个对象的17个光学过滤器的闪光信息和光谱分类比r = 24更亮,到目前为止,镜头星系的红移和分类主要是用于孤岛数字天空调查(SDSS)的局部调查,源星系的红移通常根本不可用但必须是从红移概率分布估计 - 对于微弱的调查 - 即使必须推断出来。在两种情况下,研究暗物质Halos我们将镜片星系或纳瓦罗 - Frenk-White(NFW)型材在两种情况下的纳米塔 - Frenk-Where(NFW)轮廓。在透镜光度和颜色上分别发现速度分散或病毒半径的依赖性。对于SIS模型,我们能够以LDOH'1KPC的规模再现塔利 - 费舍尔/ FABER-JACKSON关系,用于NFW轮廓,我们还计算了病毒质量,质量谱比率和旋转速度。最后,我们调查这里使用的三个调查领域之间的差异

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