检索结果-南通市图书馆

Spectral analysis of new black hole candidate AT2019wey observed by nustar

Science China(Physics,Mechanics & Astronomy) 2022年第1期65卷 92-102页

作者： Ye Feng XueShan Zhao LiJun Gou YuFeng Li James FSteiner Javier AGarc´ıa Yuan Wang Nan Jia ZhenXuan Liao HuiXian Li Key Laboratory for Computational Astrophysics National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China Harvard-Smithsonian Center for Astrophysics Cambridge MA 02138USA Cahill Centre for Astronomy and Astrophysics California Institute of TechnologyPasadena CA 91125USA Dr.Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics Bamberg 96052Germany School of Science Jimei UniversityXiamen 361021China

AT2019 wey is a new galactic X-ray binary that was first discovered as an optical transient by the Asteroid Terrestrial-impact Last Alert System(ATLAS)on December 7,***2019 wey consists of a black hole candidate as well as a low-mass companion star(M_(star)≤1.0 M_(■))and is likely to have a short orbital period(P_(orb)≤16h).Although AT2019 wey began activation in the X-ray band on March 8,2020,it did not enter the soft state during almost the entire *** this study,we present a detailed spectral analysis of AT2019 wey in the low/hard state during its X-ray outburst on the basis of Nuclear Spectroscopic Telescope Array(Nu S T AR)*** obtain tight constraints on several of its important physical parameters by applying the state of the art relxill relativistic reflection model *** particular,we determine that the measured inner radius of the accretion disk is most likely to have extended to the innermost stable circular orbit(ISCO)radius,i.e.,R_(in)=1.38^(+0.23)_(-0.16)R_(ISCO).Hence,assuming R_(in)=R_(ISCO),we find the spin of AT2019 wey to be a*~0.97,which is close to the extreme and an inner disk inclination angle of i~22°.Additionally,according to our adopted models,AT2019 wey tends to have a relatively high iron abundance of AFe~5A_(Fe,■)and a high disk ionization state of logξ~3.4.

关键词： nustar black hole physics X-rays binaries-stars individual AT2019wey

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On joint analysing XMM-nustar spectra of active galactic nuclei

引用

中国科学技术大学学报 2024年第7期54卷 19-33,18,I0002页

作者： Jialai Kang Junxian Wang CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

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 *** 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 *** 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 *** confirm that the correction is highly effective and can commendably erase the discrepancy in best-fitΓ,E_(cut),and *** 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 ***,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 ***,We present a technical note on filtering periods of high background flares for XMM-Newton EPIC-pn exposures in the small window(SW)mode.

关键词： active galactic nuclei X-ray spectroscopy XMM-Newton nustar cross-calibration issue

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：