孤立的中子星RBS1774重访。修正的XMM-牛顿X射线参数和来自深LBT观测的光学对应物
The isolated neutron star RBS1774 revisited. Revised XMM-Newton X-ray parameters and an optical counterpart from deep LBT-observations
摘要：
本文报道了利用大双筒望远镜LBT对孤立的中子星RBS 1774进行的光学B波段观测。总曝光量为2.5小时的堆叠图像显示了在联合钱德拉和XMM-牛顿误差圆内的位置RA（2000）= 21：43：03.4，DEC（2000）} = +06：54：17：5处的mB = 26.96 +-0.20处的候选光学对应物。我们分析档案XMM-牛顿观测，并得出修订后的光谱和位置参数。从外推的X射线光谱预测的光通量可能是以前报道的两倍。测量的光通量超过外推的X射线光谱通量约40倍（15 - 60，1 σ置信度）。我们解释我们的检测和光谱能量分布的进一步证据的温度结构的中子星的表面，并提出了一个纯热模型，反映了SED和脉冲部分的光变曲线。
英文摘要：
We report optical B-band observations with the Large Binocular Telescope LBT of the isolated neutron star RBS1774. The stacked image with total exposure 2.5h reveals a candidate optical counterpart at mB = 26.96 +- 0.20 at position RA(2000) = 21:43:03.4, DEC(2000)} = +06:54:17:5, within the joint Chandra and XMM-Newton error circles. We analyse archival XMM-Newton observations and derive revised spectral and positional parameters. The predicted optical flux from the extrapolated X-ray spectrum is likely twice as high as reported before. The measured optical flux exceeds the extrapolated X-ray spectral flux by a factor ~40 (15 - 60 at 1sigma confidence). We interpret our detection and the spectral energy distribution as further evidence of a temperature structure over the neutron star's surface and present a pure thermal model reflecting both the SED and the pulsed fraction of the light curve.
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