We report on XMM Newton guaranteed time observations of the Seyfert galaxy MCG 6 30 15. Confirming earlier results from ASCA, BeppoSAX , and RXTE, the fluorescent FeKα line in this source is found to be extremely bro...We report on XMM Newton guaranteed time observations of the Seyfert galaxy MCG 6 30 15. Confirming earlier results from ASCA, BeppoSAX , and RXTE, the fluorescent FeKα line in this source is found to be extremely broad. Modeling the line using a line emissivity I(r)∝r -β we find β>3.This indicates that most line emission comes from the innermost regions around the central black hole. The emissivity coefficient is steeper than expected for standard models for the Fe Kα emission. This steep emission might be due to energy extraction from a rotating black hole.展开更多
15NiCuMoNb5-6-4钢(%:0.14C、1.14Ni、0.62Cu、0.32Mo、0.020Nb)用100 t EAF+LF+VD-铸锭工艺冶炼,锻成Φ350 mm管坯,然后用Φ460 mm PQF轧机轧成Φ323.9 mm×14.2 mm的钢管。该钢管的冶金质量、力学性能、脆性转变温度、高温持久强...15NiCuMoNb5-6-4钢(%:0.14C、1.14Ni、0.62Cu、0.32Mo、0.020Nb)用100 t EAF+LF+VD-铸锭工艺冶炼,锻成Φ350 mm管坯,然后用Φ460 mm PQF轧机轧成Φ323.9 mm×14.2 mm的钢管。该钢管的冶金质量、力学性能、脆性转变温度、高温持久强度等均符合标准要求。展开更多
文摘We report on XMM Newton guaranteed time observations of the Seyfert galaxy MCG 6 30 15. Confirming earlier results from ASCA, BeppoSAX , and RXTE, the fluorescent FeKα line in this source is found to be extremely broad. Modeling the line using a line emissivity I(r)∝r -β we find β>3.This indicates that most line emission comes from the innermost regions around the central black hole. The emissivity coefficient is steeper than expected for standard models for the Fe Kα emission. This steep emission might be due to energy extraction from a rotating black hole.
文摘15NiCuMoNb5-6-4钢(%:0.14C、1.14Ni、0.62Cu、0.32Mo、0.020Nb)用100 t EAF+LF+VD-铸锭工艺冶炼,锻成Φ350 mm管坯,然后用Φ460 mm PQF轧机轧成Φ323.9 mm×14.2 mm的钢管。该钢管的冶金质量、力学性能、脆性转变温度、高温持久强度等均符合标准要求。