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arXiv 1802.00795astro-ph.HE
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1H 0419-577高能翻转的性质

On the Nature of the High-Energy Rollover in 1H 0419-577

T. J. Turner, J. N. Reeves, V. Braito, M. Costa

摘要:

NuSTAR/Swift在2015年对发光的Seyfert 1星系1H 0419-577进行的观测揭示了迄今为止从AGN观察到的最极端的高能量截止之一-由于热康普顿化的起源意味着非常低的日冕温度$kT \sim 15$ keV。在硬X射线NuSTAR波段的光谱的低能量峰值,这在康普顿峰的预期发病之前达到峰值,排除了强反射的起源硬过剩在这个活动星系核。我们表明,高能量翻转的起源可能是由于热康普顿化和一个固有的陡峭的连续,这是在较低的能量吸收修改的组合。此外,建模的宽带XUV连续形状作为一个颜色校正吸积盘,需要存在一个可变的温暖的吸收体来解释所有的通量和光谱状态的源,与以前的工作一致,这个活动星系核。虽然吸收体的变化产生显着的光谱变化,在这个活动星系核,考虑所有的通量状态,使我们能够隔离的无色成分的变化,可能会出现在内部吸积流的变化,通常在$10 \, r_g$。

英文摘要:

A NuSTAR/Swift observation of the luminous Seyfert 1 galaxy 1H 0419-577 taken during 2015 reveals one of the most extreme high energy cut-offs observed to date from an AGN - an origin due to thermal Comptonization would imply a remarkably low coronal temperature $kT \sim 15$ keV. The low energy peak of the spectrum in the hard X-ray NuSTAR band, which peaks before the expected onset of a Compton hump, rules out strong reflection as the origin of the hard excess in this AGN. We show the origin of the high energy rollover is likely due to a combination of both thermal Comptonization and an intrinsically steeper continuum, which is modified by absorption at lower energies. Furthermore, modeling the broadband XUV continuum shape as a colour-corrected accretion disc, requires the presence of a variable warm absorber to explain all flux and spectral states of the source, consistent with the previous work on this AGN. While absorber variations produce marked spectral variability in this AGN, consideration of all flux states allows us to isolate a colourless component of variability that may arise from changes in the inner accretion flow, typically at around $10 \, r_g$.

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