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Sharp Chandra View of ROSAT All-Sky Survey Bright Sources I. Improvement of Positional Accuracy
Gao, Shuang1; Wang, Song2; Liu, Ji-Feng2,3
2016-12-01
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷号16期号:12
摘要The ROSAT All-Sky Survey (RASS) represents one of the most complete and sensitive soft Xray all-sky surveys to date. However, the deficient positional accuracy of the RASS Bright Source Catalog (BSC) and subsequent lack of firm optical identifications affect multi-wavelength studies of X-ray sources. The widely used positional errors sigma(pos) based on the Tycho Reference Catalog (Tycho-1) have previously been applied for identifying objects in the optical band. The considerably sharper Chandra view covers a fraction of RASS sources, whose sigma(pos) could be improved by utilizing the sub-arcsec positional accuracy of Chandra observations. We cross-match X-ray objects between the BSC and Chandra sources extracted from the Advanced CCD Imaging Spectrometer (ACIS) archival observations. A combined list of counterparts (BSCxACIS) with Chandra spatial positions weighted by the X-ray flux of multiple counterparts is employed to evaluate and improve the former identifications of BSC when used with other surveys. Based on these identification evaluations, we suggest that the point-source likeness of BSC sources and INS (isolated neutron star) candidates should be carefully reconsidered.
文章类型Article
关键词Catalogs Surveys X-rays: General X-rays: Stars
WOS标题词Science & Technology ; Physical Sciences
资助者National Natural Science Foundation of China (NSFC)(11503002 ; National Natural Science Foundation of China (NSFC)(11503002 ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; 11533002) ; 11533002) ; National Natural Science Foundation of China (NSFC)(11503002 ; National Natural Science Foundation of China (NSFC)(11503002 ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; 11533002) ; 11533002)
DOI10.1088/16711-1527/16/12/187
关键词[WOS]ISOLATED NEUTRON-STARS ; X-RAY ; SOURCE CATALOG ; XMM-NEWTON ; NUMBER
收录类别SCI
语种英语
资助者National Natural Science Foundation of China (NSFC)(11503002 ; National Natural Science Foundation of China (NSFC)(11503002 ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; 11533002) ; 11533002) ; National Natural Science Foundation of China (NSFC)(11503002 ; National Natural Science Foundation of China (NSFC)(11503002 ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; 11533002) ; 11533002)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000391647000009
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8288
专题光学天文研究部
作者单位1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
3.Univ Chinese Acad Sci, Coll Astron & Space Sci, Beijing 100049, Peoples R China
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Gao, Shuang,Wang, Song,Liu, Ji-Feng. Sharp Chandra View of ROSAT All-Sky Survey Bright Sources I. Improvement of Positional Accuracy[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(12).
APA Gao, Shuang,Wang, Song,&Liu, Ji-Feng.(2016).Sharp Chandra View of ROSAT All-Sky Survey Bright Sources I. Improvement of Positional Accuracy.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(12).
MLA Gao, Shuang,et al."Sharp Chandra View of ROSAT All-Sky Survey Bright Sources I. Improvement of Positional Accuracy".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.12(2016).
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