A recently released XMM-Newton note revealed a significant calibration issue between nuclear spectroscopic telescope array(NuSTAR)and XMM-Newton European Photon Imaging Camera(EPIC)and provided an empirical correction...A recently released XMM-Newton note revealed a significant calibration issue between nuclear spectroscopic telescope array(NuSTAR)and XMM-Newton European Photon Imaging Camera(EPIC)and provided an empirical correction to the EPIC effective area.To quantify the bias caused by the calibration issue in the joint analysis of XMM-NuSTAR spectra and verify the effectiveness of the correction,in this work,we perform joint-fitting of the NuSTAR and EPIC-pn spectra for a large sample of 104 observation pairs of 44 X-ray bright active galactic nuclei(AGN).The spectra were extracted after requiring perfect simultaneity between the XMM-Newton and NuSTAR exposures(merging good time intervals(GTIs)from two missions)to avoid bias due to the rapid spectral variability of the AGN.Before the correction,the EPIC-pn spectra are systematically harder than the corresponding NuSTAR spectra by■subsequently yielding significantly underestimated cutoff energy E_(cut)and the strength of reflection component R when performing joint-fitting.We confirm that the correction is highly effective and can commendably erase the discrepancy in best-fitΓ,E_(cut),and R.We thus urge the community to apply the correction when joint-fitting XMM-NuSTAR spectra,but note that the correction is limited to 3–12 keV and therefore not applicable when the soft X-ray band data are included.Besides,we show that as merging GTIs from two missions would cause severe loss of NuSTAR net exposure time,in many cases,joint-fitting yields no advantage compared with utilizing NuSTAR data alone.Finally,We present a technical note on filtering periods of high background flares for XMM-Newton EPIC-pn exposures in the small window(SW)mode.展开更多
测井数据共享及远程处理技术是测井技术发展的重要方向。为实现测井数据网络远程井眼校正,利用Matlab Web Server开发了基于Matlab的井眼校正网络系统。介绍了该系统的主要结构、功能、特点和相关技术。该系统由客户端计算机和服务器组...测井数据共享及远程处理技术是测井技术发展的重要方向。为实现测井数据网络远程井眼校正,利用Matlab Web Server开发了基于Matlab的井眼校正网络系统。介绍了该系统的主要结构、功能、特点和相关技术。该系统由客户端计算机和服务器组成,客户端计算机只需安装IE浏览器,测井数据通过网络传送到服务器,服务器对测井数据进行井眼校正,处理的结果保存到数据库中,并以图形和数据表格的形式返回到客户端计算机,客户端计算机还可以访问数据库中的历史数据。实现了测井数据远程处理、管理和共享,降低了系统建设维护成本,给测井数据分析人员带来了极大的便利。展开更多
基金supported by the National Natural Science Foundation of China(12033006,12192221,123B2042).
文摘A recently released XMM-Newton note revealed a significant calibration issue between nuclear spectroscopic telescope array(NuSTAR)and XMM-Newton European Photon Imaging Camera(EPIC)and provided an empirical correction to the EPIC effective area.To quantify the bias caused by the calibration issue in the joint analysis of XMM-NuSTAR spectra and verify the effectiveness of the correction,in this work,we perform joint-fitting of the NuSTAR and EPIC-pn spectra for a large sample of 104 observation pairs of 44 X-ray bright active galactic nuclei(AGN).The spectra were extracted after requiring perfect simultaneity between the XMM-Newton and NuSTAR exposures(merging good time intervals(GTIs)from two missions)to avoid bias due to the rapid spectral variability of the AGN.Before the correction,the EPIC-pn spectra are systematically harder than the corresponding NuSTAR spectra by■subsequently yielding significantly underestimated cutoff energy E_(cut)and the strength of reflection component R when performing joint-fitting.We confirm that the correction is highly effective and can commendably erase the discrepancy in best-fitΓ,E_(cut),and R.We thus urge the community to apply the correction when joint-fitting XMM-NuSTAR spectra,but note that the correction is limited to 3–12 keV and therefore not applicable when the soft X-ray band data are included.Besides,we show that as merging GTIs from two missions would cause severe loss of NuSTAR net exposure time,in many cases,joint-fitting yields no advantage compared with utilizing NuSTAR data alone.Finally,We present a technical note on filtering periods of high background flares for XMM-Newton EPIC-pn exposures in the small window(SW)mode.
文摘测井数据共享及远程处理技术是测井技术发展的重要方向。为实现测井数据网络远程井眼校正,利用Matlab Web Server开发了基于Matlab的井眼校正网络系统。介绍了该系统的主要结构、功能、特点和相关技术。该系统由客户端计算机和服务器组成,客户端计算机只需安装IE浏览器,测井数据通过网络传送到服务器,服务器对测井数据进行井眼校正,处理的结果保存到数据库中,并以图形和数据表格的形式返回到客户端计算机,客户端计算机还可以访问数据库中的历史数据。实现了测井数据远程处理、管理和共享,降低了系统建设维护成本,给测井数据分析人员带来了极大的便利。
