论文标题
使用类星体探测播层培养基的参数
Probing the parameters of the intergalactic medium using quasars
论文作者
论文摘要
我们在早期研究中检查了伽马射线爆发（GRB）和Blazars，继续使用准恒星对象（QSO）继续使用准恒星对象（QSO）进行一系列论文。我们已经在较大的红移范围内使用XMM-Newton QSO光谱估算了氢柱密度（NHxIGM），温度和金属性的IgM特性，并具有离子化等离子体的碰撞电离电离平衡（CIE）模型。 NHXIGM参数结果在固有功率定律，光谱计数，反射驼峰和软过量特征方面是可靠的。鉴于红移的光度和NHxigm量表均具有光度偏差的范围，但是鉴于审查了其他示踪剂类型的IgM参数结果一致的IgM参数结果，我们发现这不太可能。中间高柱密度吸收剂的影响很小。来自QSO样品量表的NHxigm为（1 + Z）^1.5 +/- 0.2。 z = 0时的平均氢密度为n0 =（2.8 +/- 0.3）x 10^-7 cm^-3，全红移范围内的平均IGM温度为log（t/k）= 6.5 +/- 0.1，平均金属性为[x/h] = -1.3 +/- 0.1（z 0.05）。通过以前的GRB和Blazar示踪剂汇总，我们得出的结论是，我们提供了IgM的证据，表明IGM对光谱中看到的总X射线吸收产生了基本和一致的贡献。这些结果基于用于IGM的必要简单的平板模型，因为当前X射线数据无法约束IGM红移分布
We continue our series of papers on intergalactic medium (IGM) tracers using quasi-stellar objects (QSOs), having examined gamma-ray bursts (GRBs) and blazars in earlier studies. We have estimated the IGM properties of hydrogen column density (Nhxigm), temperature and metallicity using XMM-Newton QSO spectra over a large redshift range, with a collisional ionisation equilibrium (CIE) model for the ionised plasma. The Nhxigm parameter results were robust with respect to intrinsic power laws, spectral counts, reflection hump and soft excess features. There is scope for a luminosity bias given both luminosity and Nhxigm scale with redshift, but we find this unlikely given the consistent IGM parameter results across the other tracer types reviewed. The impact of intervening high column density absorbers was found to be minimal. The Nhxigm from the QSO sample scales as (1 + z)^1.5+/-0.2. The mean hydrogen density at z = 0 is n0 = (2.8 +/- 0.3) x 10^-7 cm^-3, the mean IGM temperature over the full redshift range is log(T/K) = 6.5+/-0.1, and the mean metallicity is [X/H] = -1.3+/-0.1(Z 0.05). Aggregating with our previous GRB and blazar tracers, we conclude that we have provided evidence of the IGM contributing substantially and consistently to the total X-ray absorption seen in the spectra. These results are based on the necessarily simplistic slab model used for the IGM, due to the inability of current X-ray data to constrain the IGM redshift distribution
