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GALAXY CLUSTER ENVIRONMENTS OF RADIO SOURCES

机译:无线电源的银河群环境

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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 z0.7.
机译:使用斯隆数字天空测量(SDSS)和二十厘米无线电天空的微弱图像(FIRST)目录,我们检查了双瓣无线电源周围的光学环境。先前的研究表明,在星系团中很可能会发现在组件之间表现出一定程度弯曲的多组件无线电源。通常,这种无线电发射与星团中心的cD型星系有关。我们将SDSS和FIRST目录进行相互关联,并测量了弯曲和笔直的多分量无线电源周围集群环境的丰富程度。这导致大量星系团的发现和分类达到z〜0.5的红移。我们根据其光学和无线电特性将其分为较小的子组。我们发现FR?I无线电源比FR?II辐射源更可能在星系团中找到。此外,我们发现弯曲的无线电源比非弯曲的无线电源更常见于星系团中。我们还检查了单组分无线电源周围的环境,发现与扩展的多组分无线电源相比,单组分无线电源与星系团相关的可能性较小。大约78%的时间中,在群集或富裕群体中发现弯曲的,视觉选择的来源。在SDSS中没有光主机的主机可能与群集甚至更高的红移相关联,大多数的红移为z> 0.7。

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