AGN在聚集星系团中的重要性
The Importance of AGN in an Assembling Galaxy Cluster
摘要：
我们目前的结果，从我们的多波长研究SG 1120，一个超级星系群在z=0.37，将合并形成一个星系团可比的后发座。我们已经通过光谱确认了组成SG 1120的四个X射线发光群中的174个成员，这些群的速度色散为sigma（1D）=303-580 km/s。我们发现，相对于CL 1358 +62，一个z=0.33的丰富的星系团，超群有超过24微米的成员。SG 1120的24微米成员比例也随着星系密度的降低而增加，即红外线密度关系，这在富星系团中是没有观察到的。我们检测到9组星系在VLA 1.4 GHz的成像，和比较的无线电总红外光度表明，这些无线电检测到的成员约30%的活动星系核。射电图还显示，最明亮的星系群之一拥有射电喷流。我们目前正在分析1.4 Ghz的观测结果，以确定活动星系核是否能显著加热晕内介质，以及活动星系核是否与超过24微米的成员有关。
英文摘要：
We present results from our multi-wavelength study of SG1120, a super galaxy group at z=0.37, that will merge to form a galaxy cluster comparable in mass to Coma. We have spectroscopically confirmed 174 members in the four X-ray luminous groups that make up SG1120, and these groups have velocity dispersions of sigma(1D)=303-580 km/s. We find that the supergroup has an excess of 24 micron members relative to CL1358+62, a rich galaxy cluster at z=0.33. SG1120 also has an increasing fraction of 24 micron members with decreasing local galaxy density, i.e. an infrared-density relation, that is not observed in the rich cluster. We detect nine of the group galaxies in VLA 1.4 Ghz imaging, and comparison of the radio to total infrared luminosities indicates that about 30% of these radio-detected members have AGN. The radio map also reveals that one of the brightest group galaxies has radio jets. We are currently analysing the 1.4 Ghz observations to determine if AGN can significantly heat the intrahalo medium and if AGN are related to the excess of 24 micron members.
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