AEGIS中的半导体群：200 ksec钱德拉扩展X射线源目录
Groups of Galaxies in AEGIS: The 200 ksec Chandra Extended X-ray Source catalogue
摘要：
我们提出的发现七个X射线发射星系群选择作为扩展X射线源在200千秒钱德拉覆盖的全波长扩展Groth带国际巡天（AEGIS）。此外，我们报告活动星系核活动与这些系统。使用DEEP 2星系红移巡天覆盖范围，我们确定光学同行和确定速度色散。特别是，我们发现了三个z>0.7的大质量高红移群，其中一个在z=1.13，这是光谱选择的DEEP 2群的第一个X射线检测。我们还首次讨论了高红移质量群的L_X-T、L_X-sigma和sigma-T标度关系。我们发现这些X射线选择系统的性质与低红移下类似系统的标度关系吻合得很好，尽管在DEEP 2星表中还有一些X射线未探测到的群具有类似的速度色散。其他三个具有红移的X射线群与z~0.07处的低质量群有关，它们一起构成了AEGIS场南部的一个大结构或“超群”的一部分。所有的低红移系统都集中在大质量的椭圆星系上，而所有的高红移星系群都可能有中心星系或星系对。所有的中央星系群都有X射线点源、射电源和/或光学活动星系核辐射。中心活动星系核活动的特别有趣的例子包括一个位于z=0.74的星系群中心的双射电源加X射线点源，与z=0.066的最低红移星系群中心星系相关的扩展射电源和双X射线点源，以及z=1.13的亮绿谷星系（一对星系的一部分），它显示了活动星系核的光学发射线。
英文摘要：
We present the discovery of seven X-ray emitting groups of galaxies selected as extended X-ray sources in the 200 ksec Chandra coverage of the All-wavelength Extended Groth Strip International Survey (AEGIS). In addition, we report on AGN activity associated to these systems. Using the DEEP2 Galaxy Redshift Survey coverage, we identify optical counterparts and determine velocity dispersions. In particular, we find three massive high-redshift groups at z>0.7, one of which is at z=1.13, the first X-ray detections of spectroscopically selected DEEP2 groups. We also present a first look at the the L_X-T, L_X-sigma, and sigma-T scaling relations for high-redshift massive groups. We find that the properties of these X-ray selected systems agree well with the scaling relations of similar systems at low redshift, although there are X-ray undetected groups in the DEEP2 catalogue with similar velocity dispersions. The other three X-ray groups with identified redshifts are associated with lower mass groups at z~0.07 and together form part of a large structure or "supergroup" in the southern portion of the AEGIS field. All of the low-redshift systems are centred on massive elliptical galaxies, and all of the high-redshift groups have likely central galaxies or galaxy pairs. All of the central group galaxies host X-ray point sources, radio sources, and/or show optical AGN emission. Particularly interesting examples of central AGN activity include a bent-double radio source plus X-ray point source at the center of a group at z=0.74, extended radio and double X-ray point sources associated to the central galaxy in the lowest-redshift group at z=0.066, and a bright green valley galaxy (part of a pair) in the z=1.13 group which shows optical AGN emission lines.
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