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LIMITS ON FAR-ULTRAVIOLET EMISSION FROM WARM GAS IN CLUSTERS OF GALAXIES WITH THE HOPKINS ULTRAVIOLET TELESCOPE

机译:带有霍普金斯紫外线望远镜的星系团中的温暖气体远距离发散排放的限制

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We have searched the far-UV spectra of five clusters of galaxies observed with the Hopkins Ultraviolet Telescope (HUT) for emission in the resonance lines of O Ⅵ λλ1032, 1038 and C Ⅳ λλ1548, 1551. We do not detect significant emission from either species in any of the spectra. Lieu et al. have recently proposed a warm [(5-10) x 10~5 K] component to the intracluster medium (ICM) to explain excess 0.065-0.245 keV flux present in EUVE and ROSAT observations of the Virgo cluster. If the surface brightness of this warm component follows that of the hot, X-ray-emitting gas (i.e., is centrally condensed), then our upper limit to the O Ⅵ surface brightness in M87 is inconsistent with the presence of substantial 5 x 10~5 K gas in the center of the Virgo cluster. This inconsistency may be alleviated if the central gas temperature is approx > 7.5 x 10~5 K. HUT limits on the O Ⅵ surface brightness of the four other clusters can provide important constraints on models of their ICM.
机译:我们已经搜索了用霍普金斯紫外线望远镜(HUT)观测到的五个星系簇的远紫外光谱,以观察OⅥλλ1032、1038和CⅣλλ1548、1551的共振线中的发射。我们没有检测到这两种物种的显着发射在任何光谱中。 Lieu等。最近,我向集群内介质(ICM)提出了一个温暖的[(5-10)x 10〜5 K]分量,以解释处女座星团的EUVE和ROSAT观测中存在过量的0.065-0.245 keV通量。如果此暖组分的表面亮度跟随发出X射线的热气体(即在中心冷凝)的表面亮度,则我们在M87中OⅥ表面亮度的上限与实际存在的5 x 10不一致处女座星团中心的气体约为5K。如果中心气体温度大约> 7.5 x 10〜5 K,则可以缓解这种不一致的情况。其他四个簇的OⅥ表面亮度的HUT限制可以为其ICM模型提供重要的约束。

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