The SWELLS survey – I. A large spectroscopically selected sample of edge‐on late‐type lens galaxies
The SWELLS survey – I. A large spectroscopically selected sample of edge‐on late‐type lens galaxies
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DOI：
10.1111/j.1365-2966.2011.19378.x
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发表时间：
2011-04
影响因子：
4.8
通讯作者：
T.Treu;A.A.Dutton;M.W.Auger;P.J.Marshall;A.S.Bolton;B.J.Brewer;D.Koo;L.V.E.Koopmans Ucsb-
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文献类型：
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作者：
T.Treu;A.A.Dutton;M.W.Auger;P.J.Marshall;A.S.Bolton;B.J.Brewer;D.Koo;L.V.E.Koopmans Ucsb-
重子和暗物质对螺旋星系内部区域的相对贡献为它们的形成和演化提供了关键线索，但通常很难确定。然而，对于具有强引力透镜作用的螺旋星系，透镜效应和运动学观测的结合可以用来打破盘晕简并。反过来，这些数据约束了基本参数，如i)暗物质晕的质量密度剖面斜率和轴比，并通过与仅暗物质的数值模拟比较重子施加的修改；Ii)恒星的质量，从而整体的恒星形成效率，以及反馈的数量；Iii)通过与恒星居群综合模型的比较，得到了恒星初始质量函数的归一化。在这个系列的第一篇论文中，我们展示了16个安全的、1个可能的和6个可能的强透镜螺旋星系的样本，作为斯隆WFC Edge-on晚型透镜巡天（SWELLS）的一部分，我们使用哈勃太空望远镜和凯克- ii望远镜获得了它们的多波段高分辨率图像和旋转曲线。样本包括8个新发现的安全系统。我们根据偏转星系的形态、结构参数和恒星质量来描述它们的特征。我们发现安全透镜的SWELLS样品跨越了广泛的形态（从透镜状到晚型螺旋），光谱类型（由Hα发射量化）和凸起与总恒星质量比（0.220.85），而仅限于M * > 10 10.5 M⊙。因此，SWELLS样本非常适合于探索大范围星系中暗物质和发光物质之间的关系。我们发现偏转星系与SDSS调查中选择的细长非透镜星系的比较样本遵循相同的尺寸-质量关系。我们得出的结论是，swell样本与高质量高倾角盘状星系的总体代表性是一致的。
The relative contribution of baryons and dark matter to the inner regions of spiral galaxies provides critical clues to their formation and evolution, but it is generally difficult to determine. For spiral galaxies that are strong gravitational lenses, however, the combination of lensing and kinematic observations can be used to break the diskhalo degeneracy. In turn, such data constrain fundamental parameters such as i) the mass density profile slope and axis ratio of the dark matter halo, and by comparison with dark matter-only numerical simulations the modifications imposed by baryons; ii) the mass in stars and therefore the overall star formation efficiency, and the amount of feedback; iii) by comparison with stellar population synthesis models, the normalization of the stellar initial mass function. In this first paper of a series, we present a sample of 16 secure, 1 probable, and 6 possible strong lensing spiral galaxies, for which multi-band high-resolution images and rotation curves were obtained using the Hubble Space Telescope and Keck-II Telescope as part of the Sloan WFC Edge-on Late-type Lens Survey (SWELLS). The sample includes 8 newly discovered secure systems. We characterize the sample of deflector galaxies in terms of their morphologies, structural parameters, and stellar masses. We find that the SWELLS sample of secure lenses spans a broad range of morphologies (from lenticular to late-type spiral), spectral types (quantified by Hα emission), and bulge to total stellar mass ratio (0.220.85), while being limited to M∗ > 10 10.5 M⊙. The SWELLS sample is thus well-suited for exploring the relationship between dark and luminous matter in a broad range of galaxies. We find that the deflector galaxies obey the same size-mass relation as that of a comparison sample of elongated non-lens galaxies selected from the SDSS survey. We conclude that the SWELLS sample is consistent with being representative of the overall population of high-mass high-inclination disky galaxies.