论文标题
凉爽的中年脉冲星J1957+5033的可能光学对应物
Likely optical counterpart of the cool middle-aged pulsar J1957+5033
论文作者
论文摘要
到目前为止仅以$γ$和X射线检测到的840 Kyr Old Pulsar PSR PSR J1957+5033是附近且相当酷的中子星，温度为0.2---0.3 mk，距离为0.2---0.3 mk，距离为$ \ la $ 1 kpc，小颜色红色的$ e（b-v）\ e（b-v）\ of $ e（b-v）。这些属性使其成为在光学中检测到的理想候选者，以获得有关其参数的其他约束。因此，我们在$ g'$ band中使用10.4米的Gran Telescopio Canarias对Pulsar进行了第一个深入的光学观察，并发现其可能与$ G'= 27.63 \ pm 0.26 $。对应候选位置与0.5 ARCSEC精度内的脉冲星的X射线坐标一致。假设这是真正的对应物，我们将脉冲星X射线光谱与派生的光通量密度一起分析。结果，我们发现从冷却中子恒星的大块表面的热发射可以显着促进其光学通量。我们的多波长光谱分析有利于检测到的光源的脉冲性性质，因为它提供了脉冲星发射的物理上足够的参数。我们表明，光学数据可以对脉冲星温度和距离提供新的约束。
The 840 kyr old pulsar PSR J1957+5033, detected so far only in $γ$- and X-rays, is a nearby and rather cool neutron star with a temperature of 0.2--0.3 MK, a distance of $\la$1 kpc, and a small colour reddening excess $E(B-V) \approx 0.03$. These properties make it an ideal candidate to detect in the optical to get additional constraints on its parameters. We thus performed the first deep optical observations of the pulsar with the 10.4-meter Gran Telescopio Canarias in the $g'$ band and found its possible counterpart with $g'=27.63\pm 0.26$. The counterpart candidate position is consistent with the X-ray coordinates of the pulsar within the 0.5 arcsec accuracy. Assuming that this is the real counterpart, we analysed the pulsar X-ray spectrum together with the derived optical flux density. As a result, we found that the thermal emission from the bulk surface of the cooling neutron star can significantly contribute to its optical flux. Our multi-wavelength spectral analysis favours the pulsar nature of the detected optical source, since it provides physically adequate parameters of the pulsar emission. We show that the optical data can provide new constraints on the pulsar temperature and distance.
