论文标题
X射线瞬态Swift J1745-26的宽带光谱能量分布
Broad-band spectral energy distribution of the X-ray transient Swift J1745-26 from outburst to quiescence
论文作者
论文摘要
We study the X-ray transient Swift J1745-26, using observations obtained from its outburst in September 2012, up to its decay towards quiescence in March 2013. We obtained optical and infrared observations, through override programme at ESO/VLT with FORS2 and ISAAC instruments, and archival optical (VLT/VIRCAM), radio and X-ray (Swift) observations, to build the lightcurve and the Swift J1745-26的宽带光谱分布（SED）。我们表明，在其爆发和静止期间，Swift J1745-26 SED可以通过粘液盘发出的粘性辐照的多彩色黑体的总和来调整，从红外到X射线，并通过积聚盘和高能的Synchrotrotraw发射。在无线电域中，SED由射流的同步加速器发射引起。尽管我们的SED拟合证实了源爆发期间的源保持低/硬状态，但我们在频率为3.1 <nu_break <3.4 x 10^14 Hz的X射线频谱中断，并在10^12 Hz <nu_break <10^13 Hz处进行无线电频谱中断。我们还表明，该系统与〜7.69个幅度的吸收平均兼容，位于d〜 [2.6-4.8] kpc的距离间隔内，轨道周期p_orb = 11.3小时的上限，伴侣恒星是范围K0-m0 v范围内的频谱类型的恒星，该系统是一个低点，该系统是一个低点的k0-m0 v，ray s ray s a s ray s ray s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s a s ray s a s a是一个零件。我们最终将Swift J1745-26的位置绘制在光向 - X射线光度图上：该图上的定位与源爆发和衰减阶段中的源保持低硬度状态一致。
We study the X-ray transient Swift J1745-26, using observations obtained from its outburst in September 2012, up to its decay towards quiescence in March 2013. We obtained optical and infrared observations, through override programme at ESO/VLT with FORS2 and ISAAC instruments, and archival optical (VLT/VIRCAM), radio and X-ray (Swift) observations, to build the lightcurve and the broad-band Spectral Energy Distribution (SED) of Swift J1745-26. We show that, during its outburst and also during its decay towards quiescence, Swift J1745-26 SED can be adjusted, from infrared up to X-rays, by the sum of both a viscous irradiated multi-colour blackbody emitted by an accretion disk, and a synchrotron powerlaw at high energy. In the radio domain, the SED arises from synchrotron emission from the jet. While our SED fitting confirms that the source remained in the low/hard state during its outburst, we determine an X-ray spectral break at frequency 3.1 < nu_break < 3.4 x 10^14 Hz, and a radio spectral break at 10^12 Hz < nu_break < 10^13 Hz. We also show that the system is compatible with an absorption Av of ~7.69 magnitudes, lies within a distance interval of D~[2.6-4.8] kpc, with an upper limit of orbital period P_orb = 11.3 hours, and that the companion star is a late-type star of spectral type in the range K0 - M0 V, confirming that the system is a low-mass X-ray binary. We finally plot the position of Swift J1745-26 on an optical-infrared - X-ray luminosity diagram: its localization on this diagram is consistent with the source staying in the low-hard state during outburst and decay phases.
