GALAXY CLUSTER ENVIRONMENTS OF RADIO SOURCES
GALAXY CLUSTER ENVIRONMENTS OF RADIO SOURCES
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DOI：
10.1088/0004-6256/141/3/88
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
J. Wing;E. Blanton
中科院分区：
文献类型：
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作者：
J. Wing;E. Blanton
利用斯隆数字巡天（SDSS）和射电天空20厘米（FIRST）星表的微弱图像，我们研究了双瓣射电源周围的光学环境。以前的研究表明，在星系团中可能会发现多分量射电源，这些射电源在组件之间表现出一定程度的弯曲。通常这种射电辐射与星团中心的CD型星系有关。我们交叉相关的SDSS和FIRST目录，并测量了弯曲和直多分量射电源周围的集群环境的丰富性。这导致了大量星系团的发现和分类，其红移达到z = 0.5。我们根据它们的光学和无线电特性将我们的样本分成更小的子组。我们发现，FR I射电源更有可能被发现在星系团比FR II源。此外，我们发现，弯曲的射电源更经常发现在星系团比非弯曲的射电源。我们还研究了单组分射电源周围的环境，发现单组分射电源不太可能与星系团相关联，而不是扩展的多组分射电源。弯曲的，视觉上选择的源被发现在集群或丰富的组中，78%的时间。那些在SDSS中没有光学主体的星系团可能与红移更高的星系团有关，大多数红移>0.7。
Using the Sloan Digital Sky Survey (SDSS) and the Faint Images of the Radio Sky at Twenty Centimeters (FIRST) catalogs, we examined the optical environments around double-lobed radio sources. Previous studies have shown that multi-component radio sources exhibiting some degree of bending between components are likely to be found in galaxy clusters. Often this radio emission is associated with a cD-type galaxy at the center of a cluster. We cross-correlated the SDSS and FIRST catalogs and measured the richness of the cluster environments surrounding both bent and straight multi-component radio sources. This led to the discovery and classification of a large number of galaxy clusters out to a redshift of z ∼ 0.5. We divided our sample into smaller subgroups based on their optical and radio properties. We find that FR I radio sources are more likely to be found in galaxy clusters than FR II sources. Further, we find that bent radio sources are more often found in galaxy clusters than non-bent radio sources. We also examined the environments around single-component radio sources and find that single-component radio sources are less likely to be associated with galaxy clusters than extended, multi-component radio sources. Bent, visually selected sources are found in clusters or rich groups ∼78% of the time. Those without optical hosts in SDSS are likely associated with clusters at even higher redshifts, most with redshifts of z>0.7.