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arXiv 1609.08002astro-ph.HEastro-ph.CO
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发射窄线Seyfert 1星系1H 0323+342的gamma-ray黑洞质量

On the black hole mass of the gamma-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342

H. Landt, M. J. Ward, M. Balokovic, D. Kynoch, T. Storchi-Bergmann, C. Boisson, C. Done, J. Schimoia, D. Stern

摘要:

窄线塞弗特1星系是由费米伽玛射线太空望远镜发现的一类罕见的伽玛射线活动星系核。其中红移最低的候选者是源1H 0323+342。在这里,我们提出了准同步双子近红外和凯克光谱,从中我们得到一个黑洞质量的基础上广泛的巴尔末和Paschen发射线。我们补充这些意见与NuSTAR的X射线光谱采取了大约两年前,从我们约束的黑洞质量的基础上的短时间尺度的光谱变化。我们的多波长观测表明,黑洞的质量约为2 × 10^7太阳质量,这与之前的估计非常吻合。我们建立的光谱能量分布,并表明,它是占主导地位的热量和再处理的排放从吸积盘,而不是非热喷流组件。用Done等人的能量守恒吸积盘模型进行详细的谱拟合,对于(非旋转)Schwarzschild黑洞,将爱丁顿比限制为L/L_Edd ~ 0.5,对于无量纲自旋为a*=0.8的Kerr黑洞,将爱丁顿比限制为L/L_Edd ~ 1。更高的自旋值和更高的爱丁顿比被排除在外,因为它们会强烈地高估所观察到的软X射线通量。

英文摘要:

Narrow-line Seyfert 1 galaxies have been identified by the Fermi Gamma-Ray Space Telescope as a rare class of gamma-ray emitting active galactic nuclei (AGN). The lowest-redshift candidate among them is the source 1H 0323+342. Here we present quasi-simultaneous Gemini near-infrared and Keck optical spectroscopy for it, from which we derive a black hole mass based on both the broad Balmer and Paschen emission lines. We supplement these observations with a NuSTAR X-ray spectrum taken about two years earlier, from which we constrain the black hole mass based on the short timescale spectral variability. Our multiwavelength observations suggest a black hole mass of ~2x10^7 solar masses, which agrees well with previous estimates. We build the spectral energy distribution and show that it is dominated by the thermal and reprocessed emission from the accretion disc rather than the non-thermal jet component. A detailed spectral fitting with the energy-conserving accretion disc model of Done et al. constrains the Eddington ratio to L/L_Edd ~ 0.5 for a (non-rotating) Schwarzschild black hole and to L/L_Edd ~ 1 for a Kerr black hole with dimensionless spin of a*=0.8. Higher spin values and so higher Eddington ratios are excluded, since they would strongly overpredict the observed soft X-ray flux.

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