THE ROADMAP FOR UNIFICATION IN GALAXY GROUP SELECTION. I. A SEARCH FOR EXTENDED X-RAY EMISSION IN THE CNOC2 SURVEY
THE ROADMAP FOR UNIFICATION IN GALAXY GROUP SELECTION. I. A SEARCH FOR EXTENDED X-RAY EMISSION IN THE CNOC2 SURVEY
复制标题
星系组选择的统一路线图。
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
S. McGee
中科院分区：
文献类型：
--
作者：
A. Finoguenov;J. L. Connelly;L. Parker;D. Wilman;J. Mulchaey;R. Saglia;M. Balogh;R. Bower;S. McGee
星系群的X射线特性可以解开现代河外天文学中一些最具挑战性的研究课题：结构的增长及其对星系形成的影响。只有随着钱德拉和XMM-牛顿设备的出现，X射线观测才能达到以令人满意的方式解决这些问题所需的深度。在这里，我们提出了一个X射线成像研究的两个补丁从hocC 2光谱星系调查结合钱德拉和XMM-牛顿数据。一个国家的最先进的扩展源查找算法已被应用，并由此产生的源目录，包括红移光谱后续计划，提出。光谱鉴定的基团总数为25个，红移范围为0.04-0.79。在较深的X射线（RA 14 h）场中，大约50%的hocC 2光谱选择组可能是X射线检测，而在较浅的（RA 21 h）场中，这一比例为20%。统计建模表明，这与预期一致，假设LX-M关系的预期演变。光谱和X射线组的叠加剪切信号的显著检测表明，两种样品都含有约为预期质量的真实的组。我们的结论是，目前的X射线和光谱设备的面积和深度提供了一个独特的机会窗口，在z = 0.4，以测试X射线的外观，以各种方式选择的星系群。目前还没有证据表明X射线光度和速度色散之间的相关性随红移而显著变化，这意味着基于两种方法的星表都可以进行比较和建模。
X-ray properties of galaxy groups can unlock some of the most challenging research topics in modern extragalactic astronomy: the growth of structure and its influence on galaxy formation. Only with the advent of the Chandra and XMM-Newton facilities have X-ray observations reached the depths required to address these questions in a satisfactory manner. Here we present an X-ray imaging study of two patches from the CNOC2 spectroscopic galaxy survey using combined Chandra and XMM-Newton data. A state of the art extended source finding algorithm has been applied, and the resultant source catalog, including redshifts from a spectroscopic follow-up program, is presented. The total number of spectroscopically identified groups is 25 spanning a redshift range 0.04–0.79. Approximately 50% of CNOC2 spectroscopically selected groups in the deeper X-ray (RA14h) field are likely X-ray detections, compared to 20% in the shallower (RA21h) field. Statistical modeling shows that this is consistent with expectations, assuming an expected evolution of the LX–M relation. A significant detection of a stacked shear signal for both spectroscopic and X-ray groups indicates that both samples contain real groups of about the expected mass. We conclude that the current area and depth of X-ray and spectroscopic facilities provide a unique window of opportunity at z ∼ 0.4 to test the X-ray appearance of galaxy groups selected in various ways. There is at present no evidence that the correlation between X-ray luminosity and velocity dispersion evolves significantly with redshift, which implies that catalogs based on either method can be fairly compared and modeled.
DOI：
10.1111/j.1365-2966.2009.15193.x
发表时间：
2009
影响因子：
4.8
作者：
Balogh M
通讯作者：
Balogh M