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arXiv 0809.4691astro-ph
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类星体3C 287的深XMM-牛顿观测

A Deep XMM-Newton Observation of the Quasar 3C 287

G. Salvesen, J. M. Miller, E. Cackett, A. Siemiginowska

摘要:

我们报告的XMM-牛顿观测z=1.055类星体和千兆赫兹峰谱(GPS)源3C 287。我们的62.3千秒观测提供了一个特殊的X射线视图的一个重要的活动星系核(AGN)子类的突出成员。3C 287的X射线光谱符合简单的吸收幂律,光谱指数为Gamma = 1.72 +/- 0.02。我们的拟合结果表明,在0.3-10.0 keV波段的辐射热光度L = 5.8 +/- 0.2 E+45 erg/s;这给出了M > 4.6 E+7 Msun的质量下限,假设X射线贡献了10%的辐射热光度和爱丁顿极限的辐射。铁发射线在许多活动星系核的X射线光谱中很常见,但观测到的光谱似乎排除了3C 287中的强发射线。简单的幂律谱和强发射谱线的缺失可能支持我们的视线与相对论性喷流相交的图像。3C 287的毫角秒无线电成像似乎支持这一解释。我们讨论我们的结果在不同的AGN子类的背景下,GPS源窝藏新形成的黑洞喷流的可能性。

英文摘要:

We report on an XMM-Newton observation of the z=1.055 quasar and Giga-hertz Peaked Spectrum (GPS) source 3C 287. Our 62.3 ksec observation provides an exceptional X-ray view of a prominent member of this important subclass of active galactic nuclei (AGN). The X-ray spectra of 3C 287 are consistent with a simple absorbed power-law with a spectral index of Gamma = 1.72 +/- 0.02. Our fits imply a bolometric luminosity of L = 5.8 +/- 0.2 E+45 erg/s over the 0.3-10.0 keV band; this gives a mass lower limit of M > 4.6 E+7 Msun, assuming X-rays contribute 10% of the bolometric luminosity and radiation at the Eddington limit. Iron emission lines are common in the X-ray spectra of many AGN, but the observed spectra appear to rule out strong emission lines in 3C 287. The simple power-law spectrum and absence of strong emission lines may support a picture where our line of sight intersects a relativistic jet. Milliarcsecond radio imaging of 3C 287 appears to support this interpretation. We discuss our results in the context of different AGN sub-classes and the possibility that GPS sources harbor newly-formed black hole jets.

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