Hydra I星团内的行星状星云
Intracluster Planetary Nebulae in the Hydra I cluster
摘要：
利用VLT-UT 1上FORS 2摄谱仪的多光成像光谱（MSIS）技术，我们在长蛇座I星团的中心区域识别出了60个与星团内光（ICL）相关的星团内行星状星云（ICPN）候选者。长蛇座I是一个中等紧密，相对较近（约50 Mpc），位于南半球的丰富星团。在这里，我们描述了用于选择排放源的标准，并提出了这些PN候选人与ICL在水螅I集群的证据。我们还表明，使用光度特定的行星状星云的数量，α参数，与中央cD星系NGC 3311的恒星星族在集群中的PNs的预期数量是接近的PNs检测到的数量。
英文摘要：
Using the Multislit Imaging Spectroscopy (MSIS) technique at the FORS2 spectrograph on VLT-UT1, we have identified 60 Intracluster Planetary Nebula (ICPN) candidates associated with the Intracluster Light (ICL) in the central region of the Hydra I cluster. Hydra I is a medium compact, relatively near (~50 Mpc), rich cluster in the southern hemisphere. Here we describe the criteria used to select emission sources and present the evidence for these PN candidates to be associated with the ICL in the Hydra I cluster. We also show, using the luminosity-specific planetary nebulae number, the alpha parameter, that the expected number of PNs associated with the stellar population of the central cD galaxy NGC 3311 in the cluster is close to the number of PNs detected.
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