arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1809.09008astro-ph.GA
收藏

巨型射电源的更新目录

An updated catalogue of giant radio sources

A. Kuźmicz, M. Jamrozy, K. Bronarska, K. Janda-Boczar, D. J. Saikia

摘要:

我们提出了一个349个巨射电源(GRS包括星系和类星体)的目录。该数据库包含了迄今为止从文献中已知的所有巨人。这些GRS覆盖了0.016 $<$ z $<$ 3.22的红移范围,并包括投影线性尺寸大于0.7 Mpc的射电源,延伸到4.7 Mpc。我们提供的主要参数(即在天空中的主机的确切位置,红移,角度和投影的线性大小,红色光学星等,无线电形态类型,总的无线电通量密度和光度)为所有的源以及样品的特性。根据GRS在天空中的分布,我们确定了缺乏巨星的区域,以便将来对这类天体的调查可以主要集中在这些领域。从这里提出的分析,我们估计的GRS的预期数量的下限为约2000年,分辨率和灵敏度限制的第一,NRAO VLA巡天和斯隆数字巡天调查。与早期的汇编相比,尺寸为$>$ 2 Mpc的大巨星以及z $>$ 1的高红移巨星的数量有了显着的增加。我们讨论他们的进化方面,并建议这些是一致的进化模型。

英文摘要:

We present a catalogue of 349 giant radio sources (GRSs including both galaxies and quasars). The database contains all giants known to date from the literature. These GRSs cover the redshift range of 0.016$<$z$<$3.22 and include radio sources of projected linear sizes larger than 0.7~Mpc which extend up to 4.7~Mpc. We provide the principal parameters (i.e. exact position of the host in the sky, redshift, angular and projected linear size, red optical magnitude, radio morphology type, total radio flux density and luminosity) for all the sources as well as characteristics of the sample. Based on the distribution of GRSs in the sky we identify regions where there is a paucity of giants, so that future surveys for this type of objects could concentrate primarily in these fields. From the analysis presented here, we estimate a lower limit for the expected number of GRSs as about 2000, for the resolution and sensitivity limits of FIRST, NRAO VLA Sky Survey and Sloan Digital Sky Survey surveys. Compared with earlier compilations, there is a significant increase in the number of large giants with sizes $>$ 2 Mpc as well as those at high redshifts with z$>$1. We discuss aspects of their evolution and suggest that these are consistent with evolutionary models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑