首页> 外文期刊>The Astrophysical journal >THE HELLAS2XMM SURVEY. Ⅱ. MULTIWAVELENGTH OBSERVATIONS OF P3: AN X-RAY-BRIGHT, OPTICALLY INACTIVE GALAXY
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THE HELLAS2XMM SURVEY. Ⅱ. MULTIWAVELENGTH OBSERVATIONS OF P3: AN X-RAY-BRIGHT, OPTICALLY INACTIVE GALAXY

机译:HELLAS2XMM调查。 Ⅱ。 P3的多波长观测:X射线明亮,光学不活泼的银河系

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摘要

Recent X-ray surveys have clearly demonstrated that a population of optically dull, X-ray-bright galaxies is emerging at 2-10 keV fluxes of the order of 10~(-14) ergs cm~(-2) s~(-1). Although they might constitute an important fraction of the sources responsible for the hard X-ray background, their nature is still unknown. With the aim of better understanding the physical mechanisms responsible for the observed properties, we have started an extensive program of multiwavelength follow-up observations of hard X-ray, optically quiet galaxies discovered with XMM-Newton. Here we report the results of what can be considered the first example of this class of objects: CXOU J031238.9-765134, originally discovered by Chandra, and optically identified by Fiore et al. (2000) with an apparently normal early-type galaxy at z = 0.159, usually known as FIORE P3. Analysis of the broadband energy distribution suggests the presence of a heavily obscured active nucleus.
机译:最近的X射线调查清楚地表明,在2-10 keV的光通量下,大约10〜(-14)ergs cm〜(-2)s〜(- 1)。尽管它们可能构成造成硬X射线背景的辐射源的重要部分,但其性质仍然未知。为了更好地了解造成观测特性的物理机制,我们启动了一个广泛的程序,对通过XMM-Newton发现的硬X射线,光学安静的星系进行多波长跟踪观测。在这里,我们报告的结果可视为此类对象的第一个示例:CXOU J031238.9-765134,最初由Chandra发现,并由Fiore等人光学识别。 (2000年),其z = 0.159处具有明显正常的早期星系,通常称为FIORE P3。对宽带能量分布的分析表明存在严重被遮盖的活动核。

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