Large scale diffuse light in the Coma cluster: A multi-scale approach
Large scale diffuse light in the Coma cluster: A multi-scale approach
复制标题
后发星团中的大规模漫射光：多尺度方法
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
M. Ulmer
中科院分区：
文献类型：
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作者：
C. Adami;É. Slezak;F. Durret;C. Conselice;J. Cuillandre;J. Gallagher;A. Mazure;R. Pelló;J. Picat;M. Ulmer
我们用CFH12K相机在CFHT获得了B、V、R和I波段的彗星团的广视场图像。为了寻找大尺度的漫射辐射，我们对这些图像应用了迭代的多尺度小波分析和重建技术，这使得能够对所有源(恒星和星系)进行建模并从原始图像中减去它们。我们在中心星系NGC4874和NGC4889周围的中心区域发现了不同浓度的漫射辐射。我们描述了这些浓度的位置、大小和颜色。一些来源似乎没有很强的恒星形成，而一个来源可能表现出螺旋状的颜色。恒星形成弥散辐射源的一个可能来源是，在两个主要星系区域，NGC4874和NGC4889旋涡星系最近被破坏，恒星形成仍然活跃在弥散物质中。我们还利用漫射辐射源的特性来跟踪团簇的动力学。NGC 4874周围的群体向北移动的情景与我们的数据是一致的。
We have obtained wide field images of the Coma cluster in the B, V, R and I bands with the CFH12K camera at CFHT. To search for large scale diffuse emission, we have applied to these images an iterative multiscale wavelet analysis and reconstruction technique which made it possible to model all the sources (stars and galaxies) and subtract them from the original images. We found various concentrations of diffuse emission present in the central zone around the central galaxies NGC 4874 and NGC 4889. We characterize the positions, sizes and colors of these concentrations. Some sources do not seem to have strong star formation, while one probably exhibits spiral-like colors. One possible origin for the star forming diffuse emission sources is that in the region of the two main galaxies NGC 4874 and NGC 4889 spiral galaxies have recently been disrupted and star formation is still active in the dispersed material. We also use the characteristics of the sources of diffuse emission to trace the cluster dynamics. A scenario in which the group around NGC 4874 is moving north is consistent with our data.