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>Redshift Asymmetry and Color-VelocityCorrelation in Nearby Galaxy Groups: Evidence of Dust?
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Redshift Asymmetry and Color-VelocityCorrelation in Nearby Galaxy Groups: Evidence of Dust?
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机译：附近星系群的红移不对称性和色速相关性：尘埃的证据？
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An excess of higher redshift galaxies, relative to the brightest member, in loose groups, was discovered by Arp in 1970, and was later confirmed by several authors. This effect is found to be present also in nearby small groups, identified by Tully in the Nearby Galaxy Catalogue. The asymmetry found is not likely to be ascribed to contamination by interlopers. A significant anticorrelation has also been found between the color excess E(B-V)(0)T and the velocity difference, with an associated E(B-V)(0)T variation on the order of 0.1-0.2. Such anticorrelation is not induced by obvious selection effects, such as the color-magnitude relation. A possible explanation is that groups are still collapsing and contain diffuse dust in the intragroup medium, with a mean optical depth, in the blue bland, on the order of 0.1-0.2. The mean dust density inside groups would be about 4 x 10 exp -31 g/cu cm; if the presence of dust is not only a local effect, the deduced cosmological density Omega(dust) would be in the range 10 exp -4 to 10 exp -5.
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机译：相对于最明亮的成员，在松散的群体中存在着更高的红移星系，这是由Arp在1970年发现的，后来被几位作者证实。塔利（Tully）在《附近星系目录》中也发现了附近小组中也存在这种效应。发现的不对称性不太可能归因于闯入者的污染。还发现了颜色过量E（B-V）（0）T与速度差之间的显着反相关，相关的E（B-V）（0）T的变化范围为0.1-0.2。这种反相关性不是由明显的选择效果引起的，例如颜色-数量关系。一个可能的解释是，各组仍在坍塌并在组内介质中包含弥散的尘埃，其蓝色蓝皮的平均光学深度约为0.1-0.2。各组内的平均粉尘密度约为4 x 10 exp -31 g / cu cm；如果尘埃的存在不仅是局部影响，则推导的宇宙密度Omega（尘埃）将在10 exp -4到10 exp -5的范围内。
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