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由NuSTAR/Suzaku联合观测得到的IC 4329 A的宽波段X射线谱

The Broad-band X-ray Spectrum of IC 4329A from a Joint NuSTAR/Suzaku Observation

Laura Brenneman, G. Madejski, F. Fuerst, G. Matt, M. Elvis, F. A. Harrison, D. R. Ballantyne, S. E. Boggs, F. E. Christensen, W. W. Craig, A. C. Fabian, B. W. G… 展开作者

Laura Brenneman, G. Madejski, F. Fuerst, G. Matt, M. Elvis, F. A. Harrison, D. R. Ballantyne, S. E. Boggs, F. E. Christensen, W. W. Craig, A. C. Fabian, B. W. Grefenstette, C. J. Hailey, K. K. Madsen, A. Marinucci, E. Rivers, D. Stern, D. J. Walton, W. W. Zhang

摘要:

我们已经获得了深刻的,同时观察明亮的,附近的塞弗特星系IC 4329A与朱雀和NuSTAR。通过详细的光谱分析,我们能够鲁棒地分离光谱中的连续谱、吸收谱和远距离反射谱。吸收列被认为是适度的$N_H = 6 \times 10^{21}$厘米$^2$,并没有引入任何显着的曲率在Fe K带。我们能够对加宽的Fe Kα线的存在施加强约束:$E = 6.46^{+0.08}_{-0.07}$ keV静止框架与$σ = 0.33^{+0.08}_{-0.07}$ keV和$EW = 34^{+8}_{-7}$ eV,尽管我们不能约束相对论反射模型的任何参数。这些结果突出了在附近明亮的活动星系核中观察到的宽Fe Kα线强度范围(大约一个数量级),并暗示了这些源中内部吸积盘的物理性质的相应范围。我们还更新了我们以前报告的测量的高能量截止的硬X射线发射使用两个天文台,而不仅仅是NuSTAR单独:$E_{cut} = 186 \pm 14$ keV。这种高能量截止作为日冕电子等离子体温度的代理,使我们能够进一步将该参数从等离子体的光学深度中分离出来,并更新我们对这些参数的结果。我们推导出$kT = 50^{+6}_{-3}$ keV与$τ = 2.34^{+0.16}_{-0.11}$使用球形几何形状,$kT = 61 \pm 1$ keV与$τ = 0.68 \pm 0.02$用于板几何形状,两者具有等效的拟合优度。

英文摘要:

We have obtained a deep, simultaneous observation of the bright, nearby Seyfert galaxy IC 4329A with Suzaku and NuSTAR. Through a detailed spectral analysis, we are able to robustly separate the continuum, absorption and distant reflection components in the spectrum. The absorbing column is found to be modest at $N_H = 6 \times 10^{21}$ cm$^2$, and does not introduce any significant curvature in the Fe K band. We are able to place a strong constraint on the presence of a broadened Fe Kα line: $E = 6.46^{+0.08}_{-0.07}$ keV rest frame with $σ = 0.33^{+0.08}_{-0.07}$ keV and $EW = 34^{+8}_{-7}$ eV, though we are not able to constrain any of the parameters of a relativistic reflection model. These results highlight the range in broad Fe Kα line strengths observed in nearby, bright AGN (roughly an order of magnitude), and imply a corresponding range in the physical properties of the inner accretion disk in these sources. We have also updated our previously reported measurement of the high-energy cutoff of the hard X-ray emission using both observatories rather than just NuSTAR alone: $E_{cut} = 186 \pm 14$ keV. This high-energy cutoff acts as a proxy for the temperature of the coronal electron plasma, enabling us to further separate this parameter from the optical depth of the plasma and to update our results for these parameters as well. We derive $kT = 50^{+6}_{-3}$ keV with $τ = 2.34^{+0.16}_{-0.11}$ using a spherical geometry, $kT = 61 \pm 1$ keV with $τ = 0.68 \pm 0.02$ for a slab geometry, with both having an equivalent goodness-of-fit.

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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