论文标题
从宇宙网络丝中首次检测堆叠的X射线排放
First detection of stacked X-ray emission from cosmic web filaments
论文作者
论文摘要
我们报告了ROSAT数据中宇宙Web细丝对X射线排放的首次统计检测。我们以0.2 <z <0.6的长度选择了15,165个细丝，长度从30 MPC到100 MPC，在Sloan Digital Sky Survey（SDSS）调查中确定。我们在细丝周围的Rosat中堆叠了X射线计数速率图，不包括已解决的星系组和簇构成〜3 * 10^13 msun的质量，以及从Rosat，Chandra和XMM-Newton观测值中检测到的X射线点源。堆叠的信号导致从宇宙丝中检测X射线发射，在0.56-1.21 keV的能带中显着性为4.2 Sigma。假设天体物理等离子体发射码（APEC）模型被解释为丝核区域中热气体的发射，平均气体温度为0.9（+1.0-0.6）KeV，并且气体过度密度约为30。此外，我们表明，即使平均气体温度低至〜0.3 keV，也只会以约2,000个细丝堆叠约2,000个细丝的SRG/EROSITA数据。
We report the first statistical detection of X-ray emission from cosmic web filaments in ROSAT data. We selected 15,165 filaments at 0.2<z<0.6 ranging from 30 Mpc to 100 Mpc in length, identified in the Sloan Digital Sky Survey (SDSS) survey. We stacked the X-ray count-rate maps from ROSAT around the filaments, excluding resolved galaxy groups and clusters above the mass of ~3 * 10^13 Msun as well as the detected X-ray point sources from the ROSAT, Chandra, and XMM-Newton observations. The stacked signal results in the detection of the X-ray emission from the cosmic filaments at a significance of 4.2 sigma in the energy band of 0.56-1.21 keV. The signal is interpreted, assuming the Astrophysical Plasma Emission Code (APEC) model, as an emission from the hot gas in the filament-core regions with an average gas temperature of 0.9(+1.0-0.6) keV and a gas overdensity of ~30 at the center of the filaments. Furthermore, we show that stacking the SRG/eROSITA data for ~2,000 filaments only would lead to a ~5 sigma detection of their X-ray signal, even with an average gas temperature as low as ~0.3 keV.
