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arXiv 0906.2195astro-ph.HEastro-ph.CO
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最强费米耀变体中的喷流和吸积功率

Jet and accretion power in the most powerful Fermi blazars

G. Ghisellini, F. Tavecchio, G. Ghirlanda

摘要:

在费米卫星探测到的耀变体中,我们选择了23个耀变体,它们在三个月的调查中平均伽马射线光度超过1 e48 erg/s。对于23个来源中的17个,我们发现并分析了雨燕卫星拍摄的X射线和光学紫外线数据。有了这些数据,实现档案和不同步的数据,我们构建的光谱能量分布,并解释他们与一个简单的单区,轻子,同步加速器和逆康普顿模型。在可能的情况下,我们还比较了单个源的不同高能态,如0528+134和3C 454.3,这些源有多组良好的多波长数据。在我们强大的耀变体中,高能辐射总是占主导地位的电磁输出,相对较低水平的同步辐射往往不能掩盖吸积盘辐射。这样我们就可以约束黑洞的质量和盘的光度。两者都很大(即质量等于或大于1 e9太阳质量,盘光度高于0.1爱丁顿)。通过对非热连续介质建模,我们推导出了射流以粒子和场的整体运动的形式携带的功率。平均而言,喷流功率被发现略大于磁盘光度,并成正比的质量吸积率。

英文摘要:

Among the blazars detected by the Fermi satellite, we have selected the 23 blazars that in the three months of survey had an average gamma-ray luminosity above 1e48 erg/s. For 17 out of the 23 sources we found and analysed X-ray and optical-UV data taken by the Swift satellite. With these data, implemented by archival and not simultaneous data, we construct the spectral energy distributions, and interpreted them with a simple one-zone, leptonic, synchrotron and inverse Compton model. When possible, we also compare different high energy states of single sources, like 0528+134 and 3C 454.3, for which multiple good sets of multi-wavelength data are available. In our powerful blazars the high energy emission always dominates the electromagnetic output, and the relatively low level of the synchrotron radiation often does not hide the accretion disk emission. We can then constrain the black hole mass and the disk luminosity. Both are large (i.e. masses equal or greater than 1e9 solar masses and disk luminosities above 0.1 Eddington). By modelling the non-thermal continuum we derive the power that the jet carries in the form of bulk motion of particles and fields. On average, the jet power is found to be slightly larger than the disk luminosity, and proportional to the mass accretion rate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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