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arXiv 1005.1269astro-ph.HE
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银河系中心微类星体1 E 1740.7-2942的朱雀观测

Suzaku Observations of the Galactic Center Microquasar 1E 1740.7-2942

Mark Reynolds, Jon Miller

摘要:

我们提出了两个朱雀观测银河系中心微类星体1 E 1740.7-2942,相隔约700天。在过渡到光谱硬态后,在这两种情况下都观察到了源。从1 E 1740.7-2942的显著发射被检测到300 keV的能量,在数据中没有明显的光谱中断或转换。我们尝试性地测量到~ 380 keV的截止能量的下限。在这两种情况下,发现光谱与康普顿化日冕一致,其中高能量发射与硬幂律(Γ~ 1.8)一致,在软X射线能量下,温度为~ 0.4 keV的吸积盘有显著贡献。吸积盘内径的测量值与在低硬态下吸积盘在大半径处被截断的图象不一致,而是倾向于接近ISCO(R_in ~ 10 - 20 R_g)的半径。

英文摘要:

We present two Suzaku observations of the Galactic center microquasar 1E 1740.7-2942 separated by approximately 700 days. The source was observed on both occasions after a transition to the spectrally hard state. Significant emission from 1E 1740.7-2942 is detected out to an energy of 300 keV, with no spectral break or turnover evident in the data. We tentatively measure a lower limit to the cut-off energy of ~ 380 keV. The spectra are found to be consistent with a Comptonized corona on both occasions, where the high energy emission is consistent with a hard power-law (Γ~ 1.8) with a significant contribution from an accretion disc with a temperature of ~ 0.4 keV at soft X-ray energies. The measured value for the inner radius of the accretion disc is found to be inconsistent with the picture whereby the disc is truncated at large radii in the low-hard state and instead favours a radius close to the ISCO (R_in ~ 10 - 20 R_g).

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