Fast and slow rotators in the densest environments: a SWIFT IFS study of the Coma cluster
Fast and slow rotators in the densest environments: a SWIFT IFS study of the Coma cluster
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最密集环境中的快速和慢速旋转体：SWIFT IFS 对后发星团的研究
DOI：
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
T. Goodsall
中科院分区：
文献类型：
--
作者：
R. Houghton;R. Davies;F. d’Eugenio;N. Scott;N. Thatte;F. Clarke;M. Tecza;G. Salter;L. Fogarty;T. Goodsall
我们给出了用牛津SWIFT光谱仪观测的昏迷星系团中27个星系的积分场光谱，探索了在比ATLAS3D调查中任何星系团更丰富和更密集的星系团环境中的运动形态-密度关系。我们的新数据使我们能够比较三个非常不同的星系团(处女座、彗星和阿贝尔1689)以及场/群环境中的运动学形态关系。选择彗星样本是为了匹配星团中心半径15‘(0.43Mpc)内早型群体的母体光度和椭圆度分布，并被限制在r’=16mag(相当于M_K=-21.5mag)，对该群体的三分之一进行采样。从波长-椭圆度图的分析中，我们发现早期类型的星系中有15%+-6%是慢转星系；这与根据ATLAS3D数据在野外发现的比例和室女座星系团的平均比例相同。它也与D‘Eugenio等人最近在Abell 1689中发现的平均分数相同。因此，早期类型星系的平均慢转比例在许多不同的环境中保持显著的恒定，跨越星系数密度的五个数量级。然而，在每个星系团中，慢旋转体通常出现在投影密度较高的区域，这可能是由于动力摩擦造成的质量分离。这些结果对产生早类型星系的机制提供了严格的约束：它们必须在快旋转体和慢旋转体的数量之间保持固定的比例，同时也允许早旋转体的总比例相对于磁场以星团的形式增加。对彗发进行一次完整的调查，对数百个星系而不是数十个星系进行采样，可以探测到更具代表性的彗发体积，并提供明显更强的约束，特别是在较大半径下慢速旋转部分如何变化的约束方面。
We present integral-field spectroscopy of 27 galaxies in the Coma cluster observed with the Oxford SWIFT spectrograph, exploring the kinematic morphology-density relationship in a cluster environment richer and denser than any in the ATLAS3D survey. Our new data enables comparison of the kinematic morphology relation in three very different clusters (Virgo, Coma and Abell 1689) as well as to the field/group environment. The Coma sample was selected to match the parent luminosity and ellipticity distributions of the early-type population within a radius 15' (0.43 Mpc) of the cluster centre, and is limited to r' = 16 mag (equivalent to M_K = -21.5 mag), sampling one third of that population. From analysis of the lambda-ellipticity diagram, we find 15+-6% of early-type galaxies are slow rotators; this is identical to the fraction found in the field and the average fraction in the Virgo cluster, based on the ATLAS3D data. It is also identical to the average fraction found recently in Abell 1689 by D'Eugenio et al.. Thus it appears that the average slow rotator fraction of early type galaxies remains remarkably constant across many different environments, spanning five orders of magnitude in galaxy number density. However, within each cluster the slow rotators are generally found in regions of higher projected density, possibly as a result of mass segregation by dynamical friction. These results provide firm constraints on the mechanisms that produce early-type galaxies: they must maintain a fixed ratio between the number of fast rotators and slow rotators while also allowing the total early-type fraction to increase in clusters relative to the field. A complete survey of Coma, sampling hundreds rather than tens of galaxies, could probe a more representative volume of Coma and provide significantly stronger constraints, particularly on how the slow rotator fraction varies at larger radii.
最密集环境中的快速和慢速旋转体：对 A1689 中 z = 0.183 处星系的 FLAMES/GIRAFFE 积分场光谱研究
影响因子：
4.8
作者：
D'Eugenio F
通讯作者：
D'Eugenio F
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.
甚大望远镜用 SINFONI 探测到 NGC 4486a 中的超大质量黑洞
DOI：
10.1111/j.1365-2966.2007.11949.x
发表时间：
2007
影响因子：
4.8
作者：
Saglia;Thomas;Bender;Pannella;Gebhardt;Davies
通讯作者：
Davies