arXiv 0909.53002009-09-29astro-ph.CO

Brilliant星团成员的射电性质

Radio Properties of Brightest Cluster Members

H. Andernach, M. E. Ramos-Ceja

备注：: 6 pages, 3 figures; accepted for publication in Panoramic Radio Astronomy: Wide-field 1-2 GHz research on galaxy evolution, Proceedings of Science PoS(PRA2009)057
发表信息：: PoS PRA2009:057,2009

摘要：

我们检索了文献中的射电图像和最亮的集群成员（BCM）在1169阿贝尔集群，根据其BM或RS类型或在阿贝尔目录中的文字说明，表明存在的主导星系的基础上选择的流量。我们检查了现有的无线电调查（NVSS，SUMSS，FIRST，WENSS等）的图像。并使用CATS和VizieR目录浏览器，以及其他文献，收集1423个BCM的无线电通量和无线电形态。我们发现了578个（41%）具有检测到的无线电发射的BCM，其中223个仅在单一频率下检测到。使用调查图像和已发布的高分辨率图像，我们估计了最内层射电结构的最佳位置角和每个源的最大角尺寸。DSS图像被用来获得的外包络的BCM的光学主轴的方向，和主要的光学轴和无线电轴之间的锐角差角推导出的102个对象。它的分布显示出类似的双峰性，如以前报道的一个较大的样本，虽然KS测试不区分它们从均匀的。分布的形状与天体的光学椭圆率、光学形态类型和最大线径无关。为了找到更多的具有主导中心星系的星系团，需要放宽上述标准。当比较它们的射电-光学排列角时，最多有边缘的证据表明强大的高红移射电星系和低z星系团的主导星系之间的关系。我们计划推导出射电光谱，射电光度和搜索这些参数和无线电光学对准之间的可能关系，以及将它们的无线电形态与可用的射电特有速度。

英文摘要：

We searched the literature for radio images and fluxes of brightest cluster members (BCMs) in 1169 Abell clusters, selected on the basis of their BM or RS type or on textual notes in the Abell catalog indicating the presence of dominant galaxies. We inspected the images of existing radio surveys (NVSS, SUMSS, FIRST, WENSS, etc.) and used the CATS and VizieR catalog browsers, as well as additional literature, to collect radio fluxes and radio morphologies for 1423 BCMs. We found 578 (41%) of these BCMs with detected radio emission, of which 223 are detected at only a single frequency. Using the survey images and published high-resolution images, we estimated the best available position angle for the innermost radio structure and for the largest angular size of each source. DSS images were used to obtain the orientation of the optical major axis of the outer envelope of the BCMs, and the acute difference angle between major optical and radio axes was derived for 102 objects. Its distribution shows a similar bimodality as reported previously for a larger BCM sample, although KS tests do not distinguish them from uniform ones. The shape of the distribution is independent of optical ellipticity, optical morphological type and largest linear radio size of the objects. In order to find further clusters with dominant central galaxies, the above-mentioned criteria need to be relaxed. There is at most marginal evidence for a relation between powerful high-redshift radio galaxies and dominant galaxies of low-z clusters when comparing their radio-optical alignment angle. We plan to derive radio spectra, radio luminosities and search for possible relations between these parameters and the radio-optical alignment, as well as to relate their radio morphologies with the available BCM peculiar velocities.

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